Two-bristle Greenhood

This terrestrial orchid produces a single rosette of leaves at ground level, from which rises a slender flowering stem bearing a distinctive hooded flower typical of the genus Pterostylis. The greenish, translucent bloom features a mobile, hinged labellum that triggers when disturbed by small insects, temporarily trapping them inside the hood to facilitate pollination—a mechanism shared across many members of this genus. As with other terrestrial orchids, the species relies on symbiotic mycorrhizal fungi in the soil for germination and nutrient uptake, particularly during its below-ground dormancy phases.

It contributes to local plant diversity and forms part of the understory flora in the forest ecosystems it inhabits.

The species is known only from Australia, where it occupies forest habitats, with associations also noted with cave and subterranean environments, likely reflecting the specific soil and microclimate conditions found in such settings.

Its Critically Endangered status stems from a combination of ongoing pressures: habitat degradation from livestock grazing, disturbance from mining and quarrying activities, impacts from hunting and trapping of terrestrial animals within its habitat, logging and wood harvesting reducing forest cover, altered fire regimes and fire suppression practices affecting habitat structure, and disturbance linked to harvesting of aquatic resources in adjacent systems. These combined pressures have led to a continuing decline in population.

Conservation attention for this species falls within broader Australian threatened flora frameworks, including habitat protection measures, monitoring of remaining populations, and management of fire regimes in areas where the species occurs.

Given the range of ongoing, unresolved threats and the continuing decreasing population trend, the species' outlook remains precarious without sustained intervention.