Summary:
Features include 1) resupinate growth on the underside of fallen, barkless conifer trunks, 2) a yellow-brown, waxy-gelatinous fruitbody, the margin thinning or more clearly demarcated, 3) spores that are allantoid, smooth, and inamyloid, usually with 2 oil droplets, 4) long-cylindric, thin-walled cystidia that develop yellow-brown resinous encrustation, often with septa, and 5) a monomitic hyphal system, the hyphae embedded in a gelatinous matrix.
Phlebia serialis has been found in BC, WA, ON, and NY, (Ginns), and Estonia, Finland, Norway, and Sweden, (Eriksson).
Fruiting body:
resupinate, closely adnate [firmly attached], spread out in elongate fashion, often covering large areas of the underside of lying trunks, mostly 0.005-0.02cm thick, waxy-subgelatinous when moist and living, crustaceous when dried; yellow-ochraceous when alive, when dried sordid yellow or pale ochraceous or reddish or brownish, and often grayish-pruinose; violaceous with KOH; margin thinning, sometimes more determinate [clearly demarcated], (Eriksson)
Microscopic:
SPORES 5-6 x 1.5-1.8 microns, allantoid, smooth, inamyloid, acyanophilic, thin-walled, usually with 2 oil droplets; BASIDIA 4-spored, 18-20 x 4-5 microns, narrowly clavate, sometimes constricted, with basal clamp connection; CYSTIDIA numerous, "50-50(-70) x 3.5-5" microns [sic], hyphoid, cylindric to subfusiform, thin-walled, with basal clamp connection, often with adventitious septa, bald at first then increasingly covered with yellow-brown resinous encrustation, old enclosed cystidia disappearing in a lump of resin; HYPHAE monomitic: hyphae 2-3 microns wide, "embedded in gelatinous matrix and united into a dense texture with indistinct hyphal elements", thin-walled, with clamp connections, "next to the wood as a rule a very thin layer of horizontal hyphae", (Eriksson)
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