Pterostylis fischii
| Fisch's greenhood | |
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| Pterostylis aestiva growing in Cathedral Rock National Park | |
| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Monocots |
| Order: | Asparagales |
| Family: | Orchidaceae |
| Genus: | Pterostylis |
| Species: | P. fischii |
| Binomial name | |
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Pterostylis fischii Nicholls |
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| Synonyms | |
Pterostylis fischii, commonly known as Fisch's greenhood, is a species of orchid endemic to south-eastern Australia. As with similar greenhoods, the flowering plants differ from those which are not flowering. The non-flowering plants have a rosette of leaves flat on the ground but the flowering plants have a single flower with leaves on the flowering spike. This greenhood has -coloured flowers, a sepal with a long thread-like tip and a labellum which is hidden inside the flower.
Pterostylis fischii is a terrestrial, perennial, deciduous, herb with an underground tuber and when not flowering, a rosette of egg-shaped leaves, each leaf 5-18 mm long and 6-12 mm wide. Flowering plants have a single flower 20-25 mm long and 7-9 mm wide borne on a flowering stem 150-250 mm high with between three and five stem leaves wrapped around the stem. The flowers are green, white and brown. The sepal and petals are fused, forming a hood or "galea" over the column. The dorsal sepal curves forward and downward with a thread-like tip 5-15 mm long. The sepals are held closely against the galea, have an erect, thread-like tip 15-30 mm long and a broad V-shaped sinus between their bases. The labellum is 8-9 mm long, 3-4 mm wide, dark brown, blunt, and not visible in an intact flower. Flowering occurs from February to May.
Pterostylis fischii was first formally described in 1950 by William Nicholls from a specimen collected near Woodside. The description was published in The Victorian Naturalist. The specific epithet (fischii) honours the Fisch family of Doncaster who discovered the species in 1949.
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