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

Summary:
Pseudotomentella vepallidospora is characterized among Pseudotomentella species by the dark greenish surface, the pale color and bifurcate ornamentation of the spores, and the presence of clamp connections, (Larsen, M.J.(6)). Features include 1) resupinate growth on wood, 2) a cottony to cobwebby or somewhat tomentose fruitbody with a smooth, dark green spore-bearing area, the margin darker and fringed, the subiculum darker than the spore-bearing area and fibrous, rhizomorphs present but obscure, 3) spores that are irregular to irregularly round, with bifurcate warts, the walls moderately thickened and pale yellowish to nearly colorless, 4) basidia with greenish or yellowish contents in KOH, 5) a monomitic hyphal system, the hyphae with clamp connections (nodose-septate), and grayish blue in water, becoming dull purplish brown, greenish, or yellowish in KOH, and 6) rhizomorphs associated with colorless to golden brown chlamydospores.

Pseudotomentella vepallidospora has been found in BC, WA, and OR, (Larsen, M.J.(8)).

Fruiting body:
annual, resupinate, effused up to 8cm x 4cm, up to 0.04cm thick, "separable, pelliculose"; spore-bearing area continuous, dark green, "smooth, frequently cracking and exposing the subiculum"; sterile margin fimbriate [fringed], darker than the spore-bearing area and colored as the subiculum; subiculum fibrous, darker than the spore-bearing area; cordons present but obscure, (Larsen, M.J.(8)), annual, resupinate, in small patches or effused up to 8cm x 4cm, separable in both fresh and dry state, byssoid [cottony] to arachnoid [cobwebby] or somewhat tomentose; spore-bearing area "continuous in small patches and then discontinuous and exposing the subiculum, dark green when fresh, dusky green to dusky blue green when dry", smooth, conforming to substrate; "subiculum loose, fibrous", darker than the spore-bearing area, colored as the subiculum; "cordons present, obscure"; fruitbody becoming blackish green in KOH, (Larsen, M.J.(6))

Microscopic:
SPORES 8-11(12) microns in diameter, mostly irregular to irregularly round when mature, irregularly round when immature, "strongly warted, the warts normally bifurcate", walls pale yellowish to nearly colorless; BASIDIA 4-spored, 60-80 x 9-11(13) microns, somewhat spheropedunculate to napiform [turnip-shaped] when immature, "clavate to clavipedunculate when mature, contents greenish or yellowish in KOH", "nodose-septate at the base, occasionally with median simple septa", "sterigmata up to 8 microns long and often with simple septa"; HYPHAE monomitic; SUBHYMENIAL HYPHAE 3-4.5 microns wide, "grayish blue in water becoming pale green to yellowish in KOH", thin-walled, nodose-septate; SUBICULAR HYPHAE 3.5-5.5(6.5) microns wide, "dark grayish blue in water and becoming dull purplish brown, dull greenish, or yellowish in KOH", wall thickening apparent, nodose-septate; CORDONS up to 45 microns wide, "dark grayish blue in water and becoming greenish or yellowish in KOH", individual hyphae 2.5-4.5 microns wide, nodose-septate, (Larsen, M.J.(8)), SPORES 8-11(12) microns in diameter, mostly irregular (often somewhat round), "strongly warted, the warts usually dichotomously branched", walls moderately thick, pale yellowish to nearly colorless; BASIDIA 4-spored, 60-80 x 9-11(13) microns, "arising from the hyphae of the subhymenium", clavate when mature, somewhat spheropedunculate when immature, "contents greenish or yellowish in KOH", "nodose-septate at the base, occasionally with median simple septa", "sterigmata up to 8 microns long and often with simple septa"; SUBHYMENIAL HYPHAE 3-4.5 microns wide, "arising from hyphae of the subiculum and cordons", "grayish blue in water, becoming pale green to yellowish in KOH", thin-walled, nodose-septate, branching at and from the clamp connections; SUBICULAR HYPHAE 3.5-5.5(6.5) microns wide, "dark grayish blue in water, becoming dull purplish brown, dull greenish, or yellowish in KOH", moderately thin-walled to somewhat thick-walled, nodose-septate, branching at or adjacent to the clamp connections; CORDONS up to 45 microns wide, "arising from the hyphae of the subiculum", "dark grayish blue in water, becoming greenish or yellowish in KOH", composed of individual hyphae that are 2.5-4.5 microns wide, nodose-septate, (Larsen, M.J.(6)), chlamydospores closely associated with cordons, up to 35 microns across, terminal or intercalary, colorless to pale yellow when first formed, becoming dark golden brown when mature, (Larsen, M.J.(4))