Area of occupancy estimated at 20km2, with 5 known populations and concern over quality and extent of habitat.
Hygrophoropsis umbriceps is an uncommon but rather easily recognised mushroom known from the North island and upper South Island of New Zealand. Historically the name has been incorrectly used for another rather more common, but easily distinguished and undescribed mushroom. Care is required to interpret historical data.
Why suggested for a Global Red List Assessment?
An uncommon but rather easily recognised mushroom of forest fragments under pressure from land-use change.
Known from 5 confirmed records in 5 locations. We infer the presence of 5 genotypes, x 10 to account for undetected colonies, x 5 to convert to an estimate of 250 mature individuals. Extent of Occurrence 96,000 km2 Area of Occupancy 20 km2.
Habitat and Ecology
Hygrophoropis umbriceps grows on soil in scrub with by tea-tree (myrtaceaea). The species is probably ectomycorrhizal but some species are known to be able to switch nutritional modes to saprophytes.
The known sites are/were all relatively small patches of native bush surrounded by developed land. Of the 5 known sites the type locality in South Island has been cleared for pasture and 1 historic site in Auckland now developed for housing. Only 1 site is on protected land. These fragmented areas of indigenous bush are likely to continue to be under pressure from land-use change as land is cleared for changing farming practice and urban development.
The identity of a mushroom from Tasmania known under the name Hygrophoropsis aurantiaca aff. Need investigating to see if it represents the same species, and a range extension.