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Species Information
Summary: Features include a distinct bluish semitransparent pore surface growing flat on wood and often surrounding plant remains and soil, the surface not changing color when bruised or only slowly becoming pale brown.
Physisporinus vitreus has found in BC, WA, ID, ON, AK, FL, GA, LA, MS, NC, NY, PA, and VA, (Gilbertson). It also occurs in Europe and Asia (Breitenbach).
Cap: growing flat on wood, widely spread out, up to 0.5cm thick, "waxy and soft when fresh, hard and cartilaginous when dry, often curled and partly shrunken", (Gilbertson), growing flat on wood, forming extensive patches, wax-like and cartilaginous, when dry corneous and hard, laterally spreading patches often with knot-like protuberances; sometimes fungus is bound with brown rhizomorphs, (Breitenbach)
Flesh: 0.2-0.5cm thick, dense; pale brown when dry, (Gilbertson)
Pores: 4-6 per mm, round to angular (somewhat smaller when dried); "white to bluish white and translucent when fresh, ochraceous to pale pinkish brown when dry, slightly staining when touched or bruised, but reaction slow and variable"; tube layer up to 0.5cm thick, colored as pore surface, (Gilbertson), 3-6 per mm, rounded, cream whitish becoming ocherish when old, not discoloring when handled; tube layer 0.2-0.4cm thick, (Breitenbach)
Odor: unpleasant (Breitenbach)
Taste: mild (Breitenbach)
Microscopic: spores 5-6 x 4-5 microns, oval to round, inamyloid, colorless, thin-walled, often with an oil droplet; basidia 4-spored, 12-15 x 6-8 microns, broadly clavate, simple-septate at base; cystidia absent, "fusoid cystidioles present, 15-20 x 5-6 microns, simple-septate at the base"; hyphae monomitic, hyphae of subiculum 3-6 microns wide, colorless in KOH, thick-walled to thin-walled, sparingly branched, simple-septate; hyphae of trama 2-4 microns wide, similar, (Gilbertson), spores 4.5-5(5.5) microns in diameter, nearly round, smooth, inamyloid, colorless, with droplets; cystidia-like hyphal ends numerous, mostly toward the base of tubes, 4.5-5.5 microns wide, cylindric, thick-walled, with apical crystals, (Breitenbach)
Spore Deposit: white (Buczacki)
Habitat / Range
annual, on dead wood of hardwoods, rarely conifers, associated with a white pocket rot, (Gilbertson), on moist dead wood of hardwoods and conifers, "commonly on stumps and then often growing over surrounding plant remains and soil", (Breitenbach), summer to fall (Buczacki)
Similar Species
Physisporinus sanguinolentus "has a more normal whitish color when fresh and rapidly becomes reddish and then black when bruised", and has smaller pores, (Gilbertson). P. sanguinolentus also has a softer consistency and somewhat larger spores, (Breitenbach). Physisporinus rivulosus has pores 3-4 per mm and clamp connections (Ginns).
