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Species Information
Summary: Features include 1) resupinate growth on wet wood, typically partly submerged, along shores of lakes and streams, 2) whitish color, the surface flocculose-porulose, then more continuous, the consistency soft, 3) spores that are long, narrowly fusiform, and smooth, at first thin-walled but after discharge a thick inner cyanophilic wall contracts from each end of the spore leaving the ends empty, 4) cystidia that are long, tubular, and protruding, and 5) a monomitic hyphal system, the hyphae with clamp connections.
Jaapia argillacea has been found in BC, Denmark, Norway, and Sweden, (Eriksson). Its distribution includes BC and ID, (Ginns).
Fruiting body: resupinate, effused; whitish (but argillaceous or pale yellowish in herbarium); at first flocculose-porulose, then more continuous, of rather soft consistency; "margin not especially differentiated", (Eriksson), spore deposit white (Buczacki)
Microscopic: SPORES 16-20(25) x 5-7 microns, narrowly fusiform, smooth, at first thin-walled but after discharge the protoplasm contracts from the ends of the spore and surrounds itself with a thick, strongly cyanophilic secondary wall, "leaving the spore ends empty and eventually they shrivel" (if the contraction occurs stepwise, extra septa may occur in the empty spore end); BASIDIA 4-spored, 30-50(60) x 6-9 microns, "clavate, more or less sinuous", several oil droplets present at least when fresh, with basal clamp connection, old basidia often with one or several septa; CYSTIDIA numerous, (60)100-150(200) x 5-8 microns, tubular, tapering to obtuse apex, smooth, at first thin-walled, "then with more or less thickened walls"; HYPHAE monomitic, thin-walled, mostly 3-4 microns wide, distinct, with clamp connections, richly branched, branching preferably from the clamp connections, (Eriksson)
Habitat / Range
on wet wood (conifer or hardwood) under very humid conditions (therefore preferentially found on shores of lakes and streams), (Eriksson), wet wood, typically partly submerged, along shores of lakes and streams; on Populus tremuloides (Quaking Aspen), (Ginns), all year (Buczacki)
Similar Species
Jaapia ochroleuca has spores measuring 12-18 microns long, that are fusiform and thick-walled, with "protoplasm homogeneous and not contracting", whereas J. argillacea has spores measuring 16-20 microns long, narrowly fusiform and thin-walled, with "protoplasm contracting from the ends to a central, thick-walled body, leaving the ends collapsed", (Eriksson).
