Tobias Westmeier’s Website

Little Frog Greenhood
Pterostylis occulta G.Brockman & C.J.French 2021

Notes

This species of Greenhood is closely related to the Frog Greenhood (Pterostylis sargentii), and the two species look almost identical. However, it is readily distinguished from the Frog Greenhood by its much later spring flowering period (Sep–Oct), slender, curved labellum which is densely covered in short, white hairs, and the fact that the flowers assume a characteristic bright-orange colour when they begin to wither.

The Little Frog Greenhood is fairly widespread across the Wheatbelt of Western Australia from Kalbarri in the north to Esperance in the south. I have mainly encountered it in the western Wheatbelt between Brookton and the Dryandra Woodland, but its range extends much further inland into the eastern Wheatbelt and adjacent Goldfields. It appears to favour dry leaf and bark litter in Wandoo woodland and often grows alongside the Frog Greenhood, but flowers about a month and a half later when the Frog Greenhood is already withered.

Photos

Pterostylis occulata
The flowers look very similar to those of the Frog Greenhood. (Jelcobine, WA, 18 / 09 / 2018)
Pterostylis occulata
Close-up view of an individual flower, showing the slender, hairy labellum. (Jelcobine, WA, 18 / 09 / 2018)
Pterostylis occulata
Close-up view of the characteristic, hairy labellum. (Jelcobine, WA, 18 / 09 / 2018)
Pterostylis occulata
A comparison with the Frog Greenhood (left) reveals small differences in the structure of the labellum that can be used for identification. (Jelcobine, WA, 03 / 08 / 2014 and 18 / 09 / 2018)
Pterostylis occulata
Near the end of the flowering period the colour of the flowers gradually changes from green to orange. (Jelcobine, WA, 18 / 10 / 2020)
Pterostylis occulata
Another view of the withering, orange flowers. (Dryandra Woodland, WA, 20 / 10 / 2012)

References