Pterostylis timothyi

Pterostylis timothyi, commonly known as the brittle snail orchid[3] or fawn snail orchid[4] is a species of orchid which is endemic to the south-west of Western Australia. It has a rosette of leaves at its base, and when flowering, a single green, fawn and white with erect lateral sepals.

Brittle snail orchid
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Cranichideae
Genus: Pterostylis
Species:
P. timothyi
Binomial name
Pterostylis timothyi
Synonyms[2]

Description

Pterostylis timothyi is a terrestrial, perennial, deciduous, herb with an underground tuber and a rosette of bright green, pointed leaves 5–11 mm (0.2–0.4 in) long and 4–6 mm (0.16–0.24 in) wide with prominent veins. A single bright green, fawn and white flower, 11–13 mm (0.4–0.5 in) long and 3–4 mm (0.1–0.2 in) wide is borne on a stalk 60–130 mm (2–5 in) high. The dorsal sepal and petals are fused, forming a hood or "galea" over the column, the sepal and petals with a sharp point on the end. The lateral sepals are erect, in close contact with the galea and have thread-like tips 12–18 mm (0.5–0.7 in) long. The sinus between the lateral sepals has a small notch in the centre a brownish central area. The labellum is 3–4 mm (0.1–0.2 in) long, about 2 mm (0.08 in) wide and hidden inside the flower. Flowering occurs in July and August.[5][3][4]

Taxonomy and naming

The brittle snail orchid was first formally described in 2006 by David Jones who gave it the name Linguella timothyi. The description was published in Australian Orchid Research from a specimen collected near Jerramungup.[6] In 2010 Jasmine Janes and Marco Duretto changed the name to Pterostylis timothyi.[1] The specific epithet (timothyi) honours Timothy Jones, the son of the author of this species.[3]

Distribution and habitat

The brittle snail orchid grows in woodland and heath between Hyden and Israelite Bay in the Avon Wheatbelt, Esperance Plains, Jarrah Forest and Mallee biogeographic regions.[4][7]

Conservation status

This species is classified as "not threatened" by the Government of Western Australia Department of Parks and Wildlife.[7]

References
  1. "Pterostylis russellii". APNI. Retrieved 21 July 2017.
  2. "Pterostylis timothyi". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew.
  3. Brown, Andrew; Dundas, Pat; Dixon, Kingsley; Hopper, Stephen (2008). Orchids of Western Australia. Crawley, Western Australia: University of Western Australia Press. p. 353. ISBN 9780980296457.
  4. Hoffman, Noel; Brown, Andrew (2011). Orchids of South-West Australia (3rd ed.). Gooseberry Hill: Noel Hoffman. p. 413. ISBN 9780646562322.
  5. Jones, David L. (2006). A complete guide to native orchids of Australia including the island territories. Frenchs Forest, N.S.W.: New Holland. p. 299. ISBN 978-1877069123.
  6. "Linguella timothyi". APNI. Retrieved 21 July 2017.
  7. "Pterostylis timothyi". FloraBase. Western Australian Government Department of Parks and Wildlife.
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