Pterostylis brunneola

Pterostylis brunneola, commonly known as the giant snail orchid, is a species of orchid endemic to the south-west of Western Australia. Both flowering and non-flowering plants have a large rosette of leaves flat on the ground and flowering plants have a single distinctive white flower with pale fawn stripes and have leaves on the flowering spike. This species often forms large colonies, sometimes with Caladenia species.

Giant snail orchid
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Cranichideae
Genus: Pterostylis
Species:
P. brunneola
Binomial name
Pterostylis brunneola
D.L.Jones & C.J.French[1]

Description

Pterostylis brunneola is a terrestrial, perennial, deciduous, herb with an underground tuber and a large rosette of leaves 20–55 mm (0.8–2 in) in diameter. Flowering plants have a single pale fawn and white flower 12–16 mm (0.5–0.6 in) long and 7–12 mm (0.3–0.5 in) wide on a flowering stem 90–170 mm (4–7 in) high. There are two or three stem leaves 10–15 mm (0.4–0.6 in) long and 5–8 mm (0.2–0.3 in) wide on the flowering stem. The dorsal sepal and petals are fused, forming a hood or "galea" over the column and the dorsal sepal has a blunt point. The lateral sepals are held close to the galea and have erect, thread-like tips 10–20 mm (0.4–0.8 in) long. The labellum is broad but not visible from outside the flower. Flowering occurs from July to September.[2][3]

Taxonomy and naming

Pterostylis brunneola was first formally described in 2014 by David Jones and Christopher French from a specimen collected south of Narrogin and the description was published in Australian Orchid Review. The species had previously been known as Pterostylis sp. 'giant'.[4] The specific epithet (brunneola) is a Latin word meaning "brownish", referring to the colour of the flowers.[4]

Distribution and habitat

The giant snail orchid grows near Toolibin Lake in sandy soil under species of Banksia and Allocasuarina in the Avon Wheatbelt, Esperance Plains and Jarrah Forest biogeographic regions.[2][3][5]

Conservation

Pterostylis brunneola is listed as "not threatened" by the Government of Western Australia Department of Parks and Wildlife.[5]

References
  1. "Pterostylis brunneola". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew.
  2. Brown, Andrew; Dixon, Kingsley; French, Christopher; Brockman, Garry (2013). Field guide to the orchids of Western Australia : the definitive guide to the native orchids of Western Australia. Simon Nevill Publications. p. 359. ISBN 9780980348149.
  3. Hoffman, Noel; Brown, Andrew (2011). Orchids of South-West Australia (3rd ed.). Gooseberry Hill: Noel Hoffman. p. 408. ISBN 9780646562322.
  4. "Pterostylis brunneola". APNI. Retrieved 25 July 2017.
  5. "Pterostylis brunneola". FloraBase. Western Australian Government Department of Parks and Wildlife.
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