Pterostylis macrosepala (D.L.Jones) G.N.Backh. APNI*
Synonyms: Bunochilus macrosepalus D.L.Jones APNI*
Description: Terrestrial herb
Rosette stalk 20–50 mm long; leaves 3 to 5, ovate to ovate-lanceolate to elliptic, 10–30 mm long by 5–10 mm wide, margins entire and plane or crinkled; petioles to 8 mm long.
Flowering plants 20–60 cm tall, stem leaves 5 to 10, linear-lanceolate 20–60 mm long by 3–7 mm wide. Flowers 1–8, porrect to nodding, 16–20 mm long by 10–12 mm wide, translucent green with narrow dark green stripes, but sometimes appearing wholly green; sepal tips orange-brown. Dorsal sepal 16–20 mm long when flattened, shallowly curved. Synsepalum broadly ovate, 15–18 mm long by 10–12 mm wide, flat, notched to 5–6 mm deep; margins curved, tips divergent to 7–10 mm apart. Petals obliquely oblong, narrow at base where c. 2 mm wide, broadly flared near the middle, 14–16 mm long by 4–5 mm wide; anterior margin curved, denticulate; basal flanges absent. Labellum oblong, 7.0–8.0 mm long by 2.7–3.3 mm wide, pale green with a blackish basal mound and central stripe; surface cells rounded and bead-like, with few or no acicular cells toward the base; basal mound short, erect, truncate; margins parallel or slightly concave, lateral lobes well-developed, rounded; midlobe 2.0–2.5 mm long, narrowly notched, the lobes acuminate; apex upcurved.
Distribution and occurrence: Central Western Slopes of New South Wales, from Conimbla to Bathurst. Known by few gatherings, likely to be more widely distributed.
Habitat at the type locality was a south-facing slope in sclerophyll woodland dominated by Eucalyptus polyanthemos and E. albens, with sparse shrub and ground layers.
NSW subdivisions: CWS
Text by Matt A.M. Renner (12 Dec 2019) based on Jones (2006)
Taxon concept: Jones DL (2006) Towards a revision of Bunochilus D.L.Jones & M.A.Clem. Australian Orchid Research 5: 112–142. Backhouse GN (2007) A new name in the terrestrial orchid genus Pterostylis R.Br. (Orchidaceae) for Victoria. The Victorian Naturalist 124(6): 341.
APNI* Provides a link to the Australian Plant Name Index (hosted by the Australian National Botanic Gardens) for comprehensive bibliographic data
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