Monthly photo competition

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April 2018 Winning Photograph

1804 sm JF oligochaetochilus excelsus koongawa 2

Oligochaetochilus excelsus, an impressive name for the winning photo, taken by John Fennell. It was originally formally described and named Pterostylis excelsa by Mark Clement in 1986 from a specimen cultivated from a tuber taken from Eyre Peninsula. This was subsequently published in the fourth edition of Black’s Flora of South Australia. In the early 2000s, the genus Pterostylis was split into several different genera of which Oligochaetochilus was one.

Although not everyone accepted this change, it is helpful for understanding the characteristics of this group. They are found only in Australia and are primarily a semi-arid inland group, sometimes the only orchids to occur in a locality.

Bob Bates has documented some of the drought tolerant and drought avoidance features found in this group as follows.

Drought tolerance:

  • Large moisture-storing tubers, shallowly buried to take advantage of light rain.
  • Waxy leaves pressed flat to the soil thus avoiding water loss.
  • Fast growth, some species are able to flower on just two good rainfalls.
  • Leaves senesce (die off) before or soon after flowering begins; moisture and food from the leaves is then stored in the tuber and scape. Leaves are able to absorb moisture from dew.
  • Leaves also contain an anti-freeze and can tolerate black frosts.
  • Just one month after rain a replacement storage tuber is produced as large as the old.

Drought avoidance:

  • Plants favour damper microhabitats, growing at the base of larger rocks and in seepage zones or on the cooler damper south side of bushes.
  • Tubers of desert species do not usually germinate in drought years.
  • Leaf senesces (dies off) before hot weather meaning plants avoid moisture loss during flowering.
  • Plants cease respiration in long dry periods and resume after rain even up to three months later, staying green even in bone dry soil.
  • Leaves are pressed to the soil.

References:

https://en.wikipedia.org/wiki/Pterostylis accessed 10 May 2018

Jessop, J. P. and Toelken, H. R. (eds) (1986). Flora of South Australia. 4th ed. Adelaide: Government Printers Adelaide.

Bates, R. J., ed. (2011). South Australian Native Orchids. Electronic version. NOSSA

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Winning Photograph March 2018

1803 A4 sm JF Arachnorchis formosa

Four very different species were entered this month. Ricky Egel’s autumn flowering Coryunastylis fuscoviridis (see February Journal for name usage), Rosalie Lawrence’s winter flowering Diplodium bryophilum and John Fennell’s spring flowering Stegostyla cucullata and Arachnorchis formosa.

It was no surprise that John’s A. formosa (syn. Caladenia formosa) was the winning photograph. Words such as stunning, spectacular, wonderful and attractive are used in the description of this rare orchid and is reflected in its common names – Scarlet Spider Orchid, Elegant Red Spider Orchid, Elegant Spider Orchid and Blood-red Spider Orchid. It is truly a stunning red flower with its drooping petals and sepals (tepals).

A. formosa is part of the large patersonii alliance which is characterised by white to reddish flowers with (mainly) drooping tepals ending in long, slender (sometimes thickened) sparsely to densely glandular (hairy) tails, labellum with short to long marginal teeth. The features that separate A. formosa from others in the complex are the large (~60 mm across) deep red flowers with long (~80mm) tapering, drooping tepals. Similar species to A. formosa is the smaller once common but now extremely rare Caladenia ‘Fleurieu Peninsula’ In Victoria there are some other similar species.

A. formosa is confined mainly to the South East and into south western Victoria.

References:

Backhouse, G., (2011). Spider-orchids – the Genus Caladenia and its Relatives in Australia, Melbourne, Electronic version.

Backhouse, G., et al, (2016). Bush Gems: A Guide to the Wild Orchids of Victoria, Australia, Electronic version.

Bates, R. J., ed. (2011). South Australian Native Orchids. Electronic version. NOSSA

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2018 February Winning Photograph

1802 sm RP Caladenia carnea

A small but varied number of entries for our first competition of the year. Andrew Primer entered a lovely picture Thelymitra azurea from Eyre Peninsula; Thelma Bridle entered Calochilus cupreus one of South Australia’s endangered orchids; John Fennell’s close up of Caladenia prolata and Rob Pauley’s mass flowering of Caladenia carnea.

The winner was Rob Pauley’s C. carnea a wide spread orchid which ranges from across the Eyre Peninsula through to the South East as well as occurring in the Eastern States and Tasmania. Although considered common both nationally and at a state level, there are regions within its range where it is considered to be Near Threatened, Rare and even Vulnerable. Also, despite being common, the Seedbank notes that there are areas of probable decline: Fleurieu (KAN02), Mt Lofty Ranges (FLB01), Eyre Mallee (EYB05), Wimmera (MDD05) and Southern Yorke (EYB01). It is a reminder that not only the rarest species but also that common species can be in decline.

The situation is complicated by taxonomic issues; C. carnea is not only a highly variable species but also a complex of several similar species plus many undescribed species which continues to challenge botanists.

References:

http://saseedbank.com.au/species_information.php?rid=815 accessed 8 March 2018

Backhouse, G., et al, (2016) Bush Gems: A Guide to the Wild Orchids of Victoria, Australia, Electronic version.

Bates, R. J., ed. (2011). South Australian Native Orchids. Electronic version. NOSSA

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2017 October Winning Picture

1710 JH Arachnorchis tentaculata sm

This month’s theme of “more than six flowers” was interpreted in one of two ways. There were six entries that had six or more plants and the other six entries had six or more flowers, predominately the flowers being on one inflorescence.

The competition was tight with Jane Higgs’ Caladenia tentaculata (syn. Arachnorchis tentaculata) winning by one vote. In South Australia it is known as the King Spider Orchid or Large Green Combed Spider and in Victoria is named the Eastern Mantis Orchid. As it is the largest of the Green Combed Spider Orchids, it is easily identified by its size. But there is variation and sometimes there are patches of small sized plants.

This happened to Rudie Kuiter on one of his orchid forays when he came across of patch of C. parva and small sized C. tentaculata growing together. In his book Orchid Pollinators of Victoria (page 29), he records how he distinguished the differences between the two species – “Except for some minor differences in the labellum they looked much the same. In C. tentaculata the upper margin teeth are longest, whilst in C. parva the central ones are longest. Labellum calli usually run into the red tip on C. parva and just short of the red in C. tentaculata, ...”

Though I could not find these details recorded in any of the field guides I consulted, the differences were obvious when comparing the images of C. parva and C. tentaculata on the Retired Aussies website, www.retiredaussies.com

References:

Kuiter, R. H., Orchid Pollinators of Victoria, Fourth Edition. Aquatic Photographics

http://www.retiredaussies.com/ColinsHome%20Page/Orchidssa/Arachnorchis/Arachnorchis%20parva%20SA/Arachnorchis%20parva%20SA11.htm

http://www.retiredaussies.com/ColinsHome%20Page/Orchidssa/Arachnorchis/Arachnorchis%20tentaculata/Arachnorchis%20tentaculata%20King%20Spider%20Orchid.htm

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2017 September Winning Picture

1709 sm JF Thelymitra x truncata

 

Natural hybrids are both fascinating and challenging. Fascinating because they don’t occur readily, (although of all the plant families, orchids have one of the greatest propensity for hybridising). Challenging because of the difficulty in determining the parents unlike the manmade hybrids where we can track which parents are being used to make the hybrid.

Obviously, the hybrid will share characteristics of both parents and this is the case of this month’s winning photograph, John Fennell’s Thelymitra x truncata. In the South Australian setting, a spotted orchid hybrid suggests that one of the parents will always be T. ixiodes/juncifolia and because it is blue it is most likely that the other parent will also be blue, from either the T. pauciflora or T. nuda complexes. This is true also for T. x merraniae. This is because there is no naturally occurring blue pigment. Whereas a pink or yellow parent and a blue parent will not produce a blue hybrid. Consider T. x chasmogama, T. x irregularis, T. x macmillanii are never blue.

Finally, it is fitting that this should be the winning photograph as this is the centenary month (September 2017) of its presentation to the Royal Society of South Australia, by Dr R S Rogers who also named this hybrid. The other hybrids entered were Jane Higgs Caladenia Harlequin and Diuris Earwig, both cultivated plants; Pauline Meyers Caladenia falcata X Drakonorchis barbarossa; John Fennell’s Caladenia x idiastes, T. x irregularis; Rickey Egels T. x macmillanii along with Lorraine Badger’s Caladenia roei hybrid and Caladenia x ericsoniae.

Reference

https://www.biodiversitylibrary.org/item/109628#page/353/mode/1up

https://nossa.org.au/2017/07/28/2017-june-winning-picture/

https://nossa.org.au/2014/09/26/thelymitra-x-irregularis-beautiful-but-only-a-hybrid/

Bates, R. J., ed. (2011). South Australian Native Orchids. Electronic version, 2011. NOSSA

Rules of entry:

The subject matter must have something to do with Australian orchids.  Any format is acceptable including Photo shopped images, artwork, etc

 

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2017 August Winning Picture

The following article  appeared in the Native Orchid Society of South Australia Journal September 2017 Volume 41 Number 8. It is a longer and expanded version of the article as  George Bentham was one of most influential botanists of the 19th century making it difficult to summarize his life. Even this article barely scratches the surface of this most interesting man.

The theme for the August competition was Striped or Blotched orchids.

1708 JF Thelymitra benthamiana cr

Blotches or stripes, which one? An interesting collection was entered. Representing the stripes were John Fennell’s Dipodium pardalinum, Shane Grave’s Cyrtostylis robusta labellum, Helen Lawrence’s Thelymitra cyanea, Robert Lawrence’s Diplodium dolichochilum and Lorraine Badger’s T. campanulata. There were less blotches; Ricky Egel’s Diuris pardina and John Fennell’s T. benthamiana.

T. benthamiana (Leopard Sun Orchid) is a popular orchid to photograph and it is not surprising that it is again (see April 2016) a winner in our competition. It was named after the Englishman George Bentham (1800 – 1884) one of the foremost and influential systemic botanists of the 19th century. At about the age of 16 or 17 years he was introduced to botany, and despite training as a lawyer, he devoted his life to the study of botany.

Though never visiting Australia, he produced the world’s first completed continental flora, Flora Australiensis, a seven volume work produced over 15 years (1863 – 1878). As monumental as this was, at the same time he was working on his greatest work, co-authored with Joseph Dalton Hooker, Genera Plantarum (1862 – 1883) in which is introduced the Bentham & Hooker system of plant classification. This system is still in use by many herbaria around the world. It involved the study of actual plant specimens, a practice which Bentham used himself. For instance, in the production Flora Australiensis, he would examine, critique and describe over a 1,000 species each year.

This practice harkens back to his early days when in his Flora of the French Pyrenees (1826) he adopted the practice of citing nothing second-hand. He never deviated from this. It did help that he was able to read in fourteen modern European languages plus having a good command of Latin, the language used for many botanical writings. This enabled him to access original material which he did by visiting every European herbarium when preparing for his first major work Labiatarum Genera et Species (1832 – 1836).

A shy and unassuming man, Bentham had the respect of the botanical world as was reflected in the various awards he received. Described as a genius, [a man of] indefatigable industry, the premier systematic botanist, he considered himself an amateur botanist, never a professional, even though he donated his extensive collection of more than 1,000 specimens to Kew Gardens in 1854 where he worked full time until his death in 1884. Bentham lived in, and contributed to, the transitional period from the dominance of the gentleman botanist to the government being responsible for collections of national and scientific significance.

He was responsible for introducing into orchid taxonomy (1881) a new classification recognising Subtribes, which precedes Genus in the classification system; introduced the word ‘orchidologist’ to the world in his Notes on Orchideae, 1881. Although there is only one Australian orchid named after Bentham, he has a whole genus of 29 species named after him: Benthamia which is endemic to Madagascar, Mauritius and Reunion. Worldwide, Bentham was directly involved in naming over 200 orchid taxa.

Thanks to Greg Steenbeeke for critiquing this article.

Reference

N. T. Burbidge, ‘Bentham, George (1800–1884)’, Australian Dictionary of Biography, National Centre of Biography, Australian National University, http://adb.anu.edu.au/biography/bentham-george-2979/text4345 , published first in hardcopy 1969, accessed online 29 August 2017.

George Bentham Retrieved August 31, 2017 https://en.wikipedia.org/wiki/George_Bentham

The Taxonomy of the Orchidaceae Retrieved 31 August 2017 from https://en.wikipedia.org/wiki/Taxonomy_of_the_Orchidaceae

Bentham, George (DNB00). (2012, December 29). In Wikisource. Retrieved August 31, 2017, from https://en.wikisource.org/w/index.php?title=Bentham,_George_(DNB00)&oldid=4211195

Bentham and Hooker system of Classification. Accessed August 31, 2017 from http://vle.du.ac.in/mod/book/print.php?id=13270&chapterid=29150

Notes on Orchidaea (Journal of the Linnean Society)

English Oxford Living Dictionary. Accessed 31 August, 2017 from https://en.oxforddictionaries.com/definition/orchidologist

 

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2017 July Winning Picture

July Winning Photograph

Corybas demenicus

July is Helmet Orchid Season; and the theme for the July Picture Competition.

In Australia, the genus Corybas in the broad sense (sensu lato) has four segregate genera; three on the Australian mainland (Corybas, Corysanthes & Anzybas) and one (Nematoceras) on Macquarie Island. All three mainland segregate genera were represented this month. Robert Lawrence’s, Anzybas unguiculatus; Margaret Lee, Corybas aconitiflorus with Jane Higgs, Lorraine Badger and John Fennell all entering Corysanthes diemenica. Lorraine also entered Corysanthes despectans; and John an image of Corysanthes incurva. The clear winner was Jane Higgs’ Corysanthes diemenica (synonym Corybas diemenicus).

The flower of Corybas sensu lato is characterised by a large dominant dorsal sepal and an equally dominant labellum. The other features associated with an orchid are not so obvious. The column is short and not visible. Even the ovary is barely visible whilst the other petals and sepals are but short thin filaments near the ovary. The base of the labellum wraps around to form a tube which hides the column; and the upper portion of the labellum folds back on itself and flares out. With this structure, two new features are introduced, the boss in the centre of the labellum and the auricles, two earlike openings formed from folding at the base of the labellum. Two growth features that are different from many other orchids are that the bud and leaf grow concurrently and once pollination has occurred the stem elongates so that the ovary can be raised up to 20 to 30 cms, thus allowing for seed dispersal.

Jane’s picture clearly shows these features as in the labelled image below.

Corybas demenicus

Thank you to Greg Steenbeeke for reviewing this article.

Reference

Backhouse, G, et al (2016) Bush Gems: A Guide to the Wild Orchids of Victoria Electronic version

Bates, R. J., ed. (2011). South Australian Native Orchids. Electronic version, 2011. NOSSA

Jones, D. L., A Complete Guide to Native Orchids of Australia Including the Island Territories. Reed New Holland

Jones, D. L.; Hopely, T; Duffy, S. M.; Richards, K. J.; Clements, M. A and Zhang X, Australian Orchid Genera an information and identification system. Electronic version, 2006, CSIRO

Rules of entry:

The subject matter must have something to do with Australian orchids.  Any format is acceptable including Photo shopped images, artwork, etc

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2017 June Winning Picture

1706 sm RWL Thelymitra grandiflora 10

This month’s theme for the photo competition was blue and white. White flowers can occur as a result of lack of colour such as Rosalie Lawrence’s Caladenia latifolia (Pink Fairies) which is normally pink. White orchids can also occur naturally such as the Arachnorchis argocalla (White Beauty Spider Orchid) and Arachnorchis intuta (Ghost Spider Orchid) both photographed by John Fennel, or as a dominant colour such as Lorraine Badger’s Eriochilus collinius (syn Eriochilus sp Hills Woodland).

Of the blue orchids, both Ricky Egel and John Badger entered pictures of Thelymitra x truncata (Blue Spotted Hybrid Sun Orchid) whilst Robert Lawrence entered a Thelymitra grandiflora (Giant Sun Orchid) which was the outstanding winning picture.

Blue in the floral world is unusual colour in the floral world for it is not a naturally occurring colour. In fact, “[t}he key ingredient for making blue flowers are the red anthocyanin pigments. Less than 10 percent of the 280,000 species of flowering plants produce blue flowers.” (Lee, 2010 as cited in Oder 2014).

Whilst blue orchids occur outside of Australia, their “colour cannot rival” … “the intensely blue flowers” … “especially [are] unique in the orchid world” … “of their Australian counterparts. The sun orchids (Thelymitra) in particular are famous for their sky blue flowers.” (Ronse 2008: 103)

Based upon Jones 2006 tome, the following genera have true blue orchid species – Cyanicula (9 species), Pheladenia (1 species), Epiblema (1 species) and the largest group Thelymitra (about 65 out of potentially 118 species) plus one hybrid, XGlossodenia tutelata. Of the epiphytes, blue is almost non-existent except for three which Jones lists that rarely might be bluish and they are Vappodes bigibba, V. lithocola and V. phalaenopsis*.

With such rarity, is it any wonder then that the Chinese attached special significance to it as a plant that could cure lung disease and the Aztecs saw it as a symbol of strength.

*Names used as they appear in Jones 2006 tome

Reference

Jones, D. L., A Complete Guide to Native Orchids of Australia Including the Island Territories. Reed New Holland

Lee, David (2010), Nature’s Palette: The Science of Plant Color< Chicago, University of Chicago Press

Oder, T, The Science of Blue Flowers https://www.mnn.com/your-home/organic-farming-gardening/stories/the-science-of-blue-flowers accessed 6 July 2017

Pretty Zesty All About Blue Orchids http://www.prettyzesty.com/2012/11/all-about-blue-orchids.html accessed 6 July 2017

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2017 May Winning Picture

Corunastylis morrisii @ Simpson 25/2/2017

May’s theme was miniscule, or less than 10mm. Of the eight entries five were Corunastylis, two Spider orchids from Western Australia and one an epiphyte. The flowers of the two spiders, Caladenia pachychila (photographer Rob & Jenny Pauley) and Caladenia bryceana subsp. bryceana (Pauline Myers) were the largest of the group being about 10mm across whilst the Bulbophylum globuliforme (Ros Miller) and C. despectans (Rosalie Lawrence) were the smallest being only 2mm across.

Of the remaining Corunastyllis entries the flower size ranged from 3mm for C. pumila (Rob & Jenny Pauley), 4mm for C. tepperi (Ricky Egel), 7mm for C. ciliata (Rosalie Lawrence) and 8mm for C. morrisii (Rob & Jenny Pauley).

The winning picture C. morrisii (Bearded or Hairy Midge Orchid) is one of the larger midge orchids. Other synonyms are Prasophyllum morrisii and Genoplesium morrisii. This common species is mainly found in Victoria but it does extend into southern New South Wales in the east and in the west just spills 50 km over the border into South Australia where it is rated endangered. It also occurs in the south east of Tasmania.

Flowering Times: Nov – May

  
 State N D J F M A M
Tas     √ √    
NSW     √ √ √ √  
Vic √ √ √ √ √ √ √
SA         √  √

With such a wide distribution range, it is not surprising to see quite a variation in flowering time from late spring through to autumn depending upon location.

Reference

http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Genoplesium~morrisii

https://en.wikipedia.org/wiki/Caladenia_pachychila

https://en.wikipedia.org/wiki/Caladenia_bryceana_subsp._cracens

http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Genoplesium~pumilum

Bates, R. J., ed. (2011). South Australian Native Orchids. Electronic version, 2011. NOSSA

Wapstra, M., Roberts, N., Wapstra, H. & Wapstra, A. (2012). Flowering Times of Tasmanian Orchids: A Practical Guide for Field Botanists. Self-published by the authors (May 2012
version).

Backhouse, G., Kosky, B., Rouse, D. & Turner, J. (2016). Bush Gems: A Guide to the Wild Orchids of Victoria. Self-published by the authors

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2017 April Winning Picture

1704 LN Diuris behrii sm

April’s theme was yellow and orange. All of the entries proved to be spring flowering. There were several Diuris. Claire Chesson, Rob Pauley and John Fennel all entered D. orientis; Les Nesbitt and Rob Pauley D. behrii and Pauline Meyer D. corymbosa from Western Australia. Pauline also entered Caladenia caesaria subsp. maritima and John Thelymitra benthamiana.

The winning picture was Les Nesbitt’s D. behrii (Cowslip Orchid) which occurs in Victoria, New South Wales, Australian Capital Territory whilst in South Australia it is rated as vulnerable.

Les Nesbitt has been working on a recovery project of these orchids for Hillgrove Resource’s flagship, the Kanmantoo Copper Mine, located almost 55 KM from Adelaide. As this orchid is often mentioned in NOSSA Journals, it might be worthwhile looking at the person after whom this species was named.

First collected by German born Dr Hans Herman Behr (1818 – 1904) who first visited* South Australia in 1844 when the colony was barely 8 years old. During his two years in South Australia he became the first person to systematically study our botany and entomology sending reports and samples back home. The results of his observations were published in various journals, and many of his collections were named and described by other botanists including his friend, Diedreich von Schlechtendal (1794 – 1866) who named Diuris behrii after Hans.

Hans Behr was an interesting man. A man of many aptitudes; medical doctor, entomologist, anthropologist, botanist, duellist, socialist, poet, novelist, linguist, member of the Bohemian Club of San Francisco and a man of wit. From the many reminiscences written about him, it would appear that he was a likeable gentleman and a generous teacher.

Unfortunately, not everyone liked him because “he was a sworn enemy of all scientific humbug, of quacks and false pretenders” and “he never refrained from expressing his opinion of them, quite regardless of person or station” but his humour shone forth in dealing with them. Once he named a “particularly obnoxious louse” after one of his enemies.

Behr revisited South Australia in 1848 during which time he became acquainted with German-Australian botanist, Ferdinand von Meuller. He maintained friendship with many of the scientific men of the time including Ferdinand Mueller and it was through this friendship that many Australian plants were introduced into California where Behr later settled after his travels.

Though the study of butterflies was his first and enduring love, he is remembered and honoured in Australia for his botanical interests. Of the twenty-two plants named after Behr, two are orchids: Diuris behrii and Arachnorchis behrii (synonym Caladenia behrii).

*The Journal incorrectly stated that he visited South Australia with his friend, Diedreich von Schlechtendal. This did not happen. As far as I am aware Schlechtendal did not visit South Australia.

Reference

https://archive.org/details/doctorhansherman00cali

https://archive.org/stream/jstor-1630874/1630874_djvu.txt

https://en.wikipedia.org/wiki/Hans_Hermann_Behr

https://www.anbg.gov.au/biography/behr-hermann.html

Kraehenbuehl, D. N., Dr HH Behr’s Two Visits to South Australia in 1844-45 and 1848-49, J. Adelaide Bot. Gard. 3(1): 101 – 123 (1981)

Bates, R. J., ed. (2011). South Australian Native Orchids. Electronic version, 2011. NOSSA