E-Flora BC: Electronic Atlas of the Flora of British Columbia

Summary:
Features include 1) resupinate, tightly attached fruitbodies growing on wood, 2) color that is chalky white but varying when old, the surface smooth to tuberculate, the consistency waxy, but when dried it is hard, 3) spores that are elliptic to oval, often somewhat angular, smooth, inamyloid, thick-walled, and cyanophilic, 4) basidia with a slight constriction, at the base narrowed into the bearing hyphae, 5) a monomitic hyphal system, the hyphae mostly indistinct, narrow, thin-walled, and with clamp connections.

Intextomyces contiguus has been found in BC, WA, MB, NT, ON, PQ, FL, KS MA, MN, VT, and WV, (Ginns). It is widely distributed in boreal Eurasia and North America, and specifically noted for Sweden and Norway, (Eriksson).

Fruiting body:
resupinate, effused [spread out], adnate [tightly attached], "perennial, at first thin but thickening with time"; "ceraceous and greyish white when alive and wet, hard when dry, calcareously whitish or rose grey"; "smooth or when vigorously growing more or less tuberculate or even odontioid, continuous but when dried often cracked by shrinkage"; margins mostly determinate [clearly demarcated], fertile throughout, (Eriksson)

Microscopic:
SPORES 4.5-5(6) x 3.5-4 microns, elliptic or oval, often subangulate, smooth, inamyloid, cyanophilic, thick-walled; BASIDIA 4-spored, the "epibasidial part" 10-20 x 4-6(8) microns, sterigmata 6-8 microns long, rather long and stout, at first cylindric and obtuse, later conic, somewhat curved, basidia "start as swellings at the end of penetrating hyphae, when mature short cylindrical with suburniform constriction, at the base abruptly narrowed into the bearing hyphae, no clamp at the base of the true basidium", but the bearing hypha is clamped; HYPHAE monomitic, mostly indistinct, thin-walled, with clamp connections, 1-3 microns wide, richly branched and densely interwoven into a texture, composed of two hyphal elements: 1) plasma-rich, very thin-walled, "irregularly sinuous hyphae, penetrating the fruitbody, mostly in vertical direction", and 2) "densely agglutinated hyphae, poor in protoplasm and together with remains of basidia and spores forming a pseudoparenchymatous texture", "subicular and subhymenial layers not distinguishable", (Eriksson)