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Species Information
Summary: Pseudotomentella humicola is characterized by greenish fertile areas of the fruitbody, dichotomously warted spores measuring (5.5)6-8(9) microns in diameter, and nodose-septate, brown subicular hyphae, (Larsen, M.J.(3)). Features include 1) resupinate growth on conifer wood, 2) a somewhat crustose to mostly pelliculose fruitbody with spore-bearing area continuous, greenish, and smooth, the margin not distinctive, and the subiculum dull ferruginous brown to pale brown, 3) spores that are irregular, irregularly round, or triangular, with bifurcate warts, and moderately thick, colorless to pale yellowish walls, 4) fine granular material encrusting the basidial walls becoming greenish in KOH, and 5) a monomitic hyphal system, the hyphae nodose-septate, the subicular hyphae pale yellowish to dull ferruginous brown.
Pseudotomentella humicola has been found in BC, WA, and ON, (Ginns), and in Sweden, (Larsen, M.J.(8)).
Fruiting body: annual, resupinate, effused up to 12cm x 4cm, up to 0.05cm thick, "somewhat crustose to mostly pelliculose, cracking somewhat or apparently tearing upon drying, separable in small pieces"; spore-bearing area continuous, greenish, smooth; margin not distinctive; subiculum fibrous, dull ferruginous brown to pale brown, (Larsen, M.J.(8)), subiculum up to 0.02cm thick; fruitbodies black in KOH (Larsen, M.J.(3))
Microscopic: SPORES (5.5)6-8(9) microns in diameter, irregular to irregularly round when mature, often appearing roughly triangular when immature, "warted, the warts usually bifurcate", walls colorless to pale yellowish; BASIDIA 4-spored, 50-70 x 8-10.5(11) microns, spheropedunculate to napiform [turnip-shaped] when immature, clavipedunculate when mature, thin-walled, "nodose-septate at the base, median simple septa rare", "sterigmata up to 9 microns long and rarely with simple septa", "fine granular material encrusting basidial walls becoming greenish in KOH"; HYPHAE monomitic; SUBHYMENIAL HYPHAE 2.5-3.5(4) microns wide, pale yellowish to colorless, some parts becoming green in KOH, thin-walled, nodose-septate; SUBICULAR HYPHAE 2-3.5(4.5) microns wide, "pale yellowish to dull ferruginous brown, apparently with some brown encrusting material on walls of older hyphae, sometimes associated with a grayish green diffusate in KOH", wall thickening apparent, in some cases the lumen invisible, "commonly nodose-septate, some simple septa also present"; CORDONS up to 200 microns wide, branched, dull yellowish brown, composed of compactly arranged hyphae that are 2-3 microns wide, nodose-septate and with noticeable wall thickening, commonly associated with helicoid hyphae, (Larsen, M.J.(8)), SPORES moderately thick-walled, when immature distinctly 4-lobed, (appearing roughly triangular); BASIDIA somewhat distended 10-20 microns above the basal septa when mature, width 8-10.5(11) microns taken just below the apex; SUBHYMENIAL HYPHAE arising from hyphae of the subiculum and cordons, usually branching from the clamp connections; SUBICULAR HYPHAE moderately thin-walled to thick-walled, in some cases the lumen invisible, (Larsen, M.J.(3), additional information)
Habitat / Range
on wood of Picea mariana (Black Spruce), Thuja occidentalis (Northern White-cedar), (Ginns), on wood of Picea, Pinus, Thuja, (Larsen, M.J.(8))
Similar Species
Pseudotomentella vepallidospora also has clamp connections but has chlamydospores associated with the rhizomorphs, (Larsen, M.J.(4)).
