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Species Information
Summary: Features include 1) thin, resupinate growth on wood, 2) a soft cottony consistency, a white color often with a rose tint, a smooth to slightly merulioid-tuberculate surface, and rhizomorphs, 3) spores that are subcylindric to subfusiform, smooth, and inamyloid, 4) a monomitic hyphal system, the subhymenial hyphae narrow, thin-walled, and richly branched, the subicular hyphae wider, somewhat thickened, straight, with sparse septa and clamp connections.
Leptosporomyces septentrionalis has been found in BC, AZ, and MN, (Ginns), as well as Mexico, Austria, Czechoslovakia, Denmark, Finland, Germany, Hungary, Norway, Sweden, United Kingdom, Turkey, and the USSR, (Julich).
Fruiting body: "resupinate, effused, thin, pellicular (= athelioid)"; white, often with rose tint; usually merulioid, smooth and more or less cracked when dried; margin fibrillose, often with thin rhizomorphs which are also in the wood, (Eriksson), resupinate, forming thin membranous patches several centimeters to decimeters wide, easily detached, cottony, soft; white, later ocher-yellowish, according to literature also with pink tinge; smooth to slightly merulioid-tuberculate, more or less fissured when dry; margin slightly filamentous, often with small rhizomorphs which are also seen in the wood, (Breitenbach)
Microscopic: SPORES 5-6.5 x 1.5-2 microns, subcylindric to subfusiform, smooth, inamyloid; BASIDIA 4-spored, 15-20 x 4-5 microns, clavate, with basal clamp connection; CYSTIDIA none; HYPHAE monomitic: branching from or close to clamp connections, anastomoses frequent especially in the rhizomorphs, SUBHYMENIAL HYPHAE 2.5-3.5 microns wide, thin-walled, richly branched, BASAL HYPHAE 5-7 microns wide mostly, somewhat thickened, straight, with sparse septa and clamp connections, (Eriksson), SPORES 5-6 x 1.5-2 microns, "narrowly elliptic, some flattened on one side, broadest at the base", smooth, inamyloid, colorless; BASIDIA (2-)4-spored, 10-18 x 4-5 microns, clavate; HYPHAE monomitic: SUBHYMENIAL HYPHAE 2.5-4 microns wide, thin-walled, BASAL HYPHAE 4-6 microns wide, somewhat thick-walled; all septa with clamp connections, (Breitenbach)
Habitat / Range
on very decayed wood, mostly of conifers, but sometimes of hardwoods, (Eriksson), on Betula papyrifera (Paper Birch), Picea engelmannii (Engelmann Spruce), (Ginns)
Similar Species
Leptosporomyces mutabilis has somewhat broader spores and normally lacks rhizomorphs (Breitenbach). L. mutabilis has narrowly elliptic spores that are basally rounded and 4-5 microns long, lacks a rose tint, and as a rule lacks rhizomorphs, (Eriksson). L. mutabilis has cylindric to elliptic spores measuring 3.5-5.5 x 1.8-2.8 microns, (Ginns(23)). Leptosporomyces fuscostratus has shorter spores, (Ginns(23)). Leptosporomyces galzinii has small spores 3.0-4.2 x 1.8-2.2 microns, (Ginns(23)). Leptosporomyces montanus has wider spores and longer basidia, (Ginns(23)).
