An American species (Calvatia subcretacea) that was recently recorded in Europe and subsequently transferred to Lycoperden based om molecular data (Jeppson & Larsson 2010).

An arctic-alpine species with a small world population (< 300 records globally). Grows in subarctic-alpine heathlands and grassland (Europe) and subalpine coniferous woodlands (USA). The on-going climate change combined with ceasing cattle/reindeer grazing are threats in Europe (overgrowth). American situation unknown.
Stronghold in western N. America, scattered in Europe.

Based on decline in habitat quality it could be assessed on the A-criterium. Rate of global warming and its effects must be evaluated.

Described fron Western North America where it seems to occur regularly (Rocky Mountains, the Pacific North West and the Pacific South West). Ochoa & Moreno (2006) recorded it from a single locality in Mexico, In Europe recently identified from subalpine-arctic/alpine habitats in Norway and Sweden. Unverified records from Spain (Pyrenées) and Switzerland (the Alps) need confirmation. Records from e-DNA soil samples from Asia (Taipee and Vietnam) and Africa (Rwanda) are doubtful (ITS 96-97% similarity with reference sequence) and should not be included in the present evaluation.

Less than 300 occurrences globally (GBIF).

Estimated number of localites: 500
Estimated number of mature individuals: 10000

EOO: 20 000 000 km2
AOO: 500 km2
A rare species with probable decrease (ongoing and future) in population.
Situation in N. America?

Grows in Europe in subalpine-arctic-alpine habitats, on alpine heathland and grazed grasslands. One record in upper subalpine Betula forest grazed by reindeer. The American occurrences mainly among needles and duff in coniferous forests at high elevations in the Rocky Mountains, the Pacific North West and the Pacific South West.

Suspected decline in habitat quality and availability caused by global warming.

Ceased or abandoned grazing (cattle and reindeer)