fungus genus family found mountains europe north_america siberia strictly associated species pine tree specific habitat rarity europe selected inclusion regional fruit bodies characterised having caps wet weather reach underside cap yellow angular pores pinkish colour stem tall wide typically ring remnant partial veil covers fruit body early development north_america commonly called slippery jack phylogenetic analysis shown closely related fact species taxonomy naming phylogeny species described scientifically american mycologist based material collected var central asia transferred called species today considered synonym singer named subspecies based material collected switzerland later considered published adequate description failing qualify formal scientific according singer arrangement classified section genus section includes species dots stem partial veil cap edge characteristics species include coloured spore prints olive wide pores underside cap wider mature species include phylogenetic analysis eastern asian eastern north american species revealed forms supported clade relationships previous analysis larger sampling species determine taxonomic relationships genus clade separated rest group phylogenetic relationships tested determined different methods analysis consistent established confidence general little phylogenetic divergence detected clade description fruit body medium sized cap straw yellow expands maturity finally darker reddish brown spots cap diameter cap cuticle especially moist partial veil extends stem cap periphery immature specimens mature specimens leaving ring stem fragments hanging cap periphery tubes initially yellow brown slightly pores angular wider diameter colour tubes stain dirty pink bruised tubes pores long present leave dark brown spots drying stem cylindrical tall wide yellow pink red base covered darker fruit body matures partial veil later ring white attached stem ring short lived present thought fruit bodies develop dry conditions likely ring flesh pale yellow red brown bruised firm maturity increasingly soft spore deposit coloured brown spores ellipsoid sized thin walled smooth seen microscope basidia spore bearing cells club shaped spored measure flesh potassium solution applied iron solution flesh slowly grey reportedly edible commercial value species mushrooms frequently collected consumption taste described variously authors sour europe distinctive slightly bitter north_america distinctive similar species north_america similar appearance easterly distribution associated eastern white pine authors tried distinguish width stem differences fruit body acknowledged characteristics variable depend environmental factors phylogenetic analysis colleagues suggests taxa samples different geographical areas needed verify distribution habitat recorded parts europe north_america siberia fungus forms strict associations subgenus include swiss pine alps central europe pine balkans western white pine pine pacific_northwest north_america quebec canada pine dwarf pine siberia russian far east range fungus limited distribution host tree shown able form species pure culture conditions laboratory fungus rare europe distribution typically corresponds high elevations near alpine tree line found countries included countries considered critically endangered czech_republic suggested listed convention factors threaten habitat include construction skiing infrastructure winter sports fungus fruits summer autumn europe western north_america occurs north american distribution extends south mexico
Suillus sibiricus