Summary:
Features include 1) resupinate growth on the bark and on the underside of branches of Douglas-fir and Western Hemlock, 2) corticioid whitish fruitbodies, at first in separate patches 0.5-1.5cm across, readily confluent, with tightly attached margins that become more distinct as they mature, 3) nearly round, amyloid spores that are densely echinulate in Melzer''s reagent, 4) a catahymenium consisting of a) initially embedded basidial elements, b) scattered paraphysoids, c) deep-seated to emergent pseudocystidia (flexuous-cylindric to subclavate, often bearing an apical bulb, darkening in sulphobenzaldehyde), and d) numerous acanthophyses (thin-walled, aculeate-pronged parts borne laterally or apically or both), and 5) a monomitic context with clamp connections.
Aleurodiscus spiniger has been recorded from BC, OR, ID, and AZ, (Ginns). Collections were examined from BC, OR, ID, and China, (Lemke).
Fruiting body:
corticioid, at first in separate patches 0.5-1.5cm across, "readily confluent, and then effused indefinitely", 0.02-0.06cm thick, texture pruinose to farinose-pulverulent; white when fresh, drying cream to cartridge-buff; drying rimose to [cracked like dried mud]; margins "indeterminate, thinning toward the edges, adnate, at length more determinate", (Lemke)
Microscopic:
SPORES (10)11.5-14(16) x (9)9.5-12(13) microns, nearly round, slightly flattened adaxially, densely echinulate in Melzer''s reagent, amyloid, firm-walled, apiculate; catahymenium consisting of initially embedded basidial elements, scattered paraphysoids, deep-seated to emergent pseudocystidia, and numerous acanthophyses; BASIDIA 4-spored, obscured, 60-90 x 10-13 microns, flexuous-cylindric to subclavate, sterigmata 7-9 microns long and 1.5-2.5 microns wide at base; PARAPHYSOIDS rare, 3-4.5 microns wide, simple to slightly branched; PSEUDOCYSTIDIA (macrocystidia) 50-85 x 4-7 microns, flexuous-cylindric to subclavate, often bearing an apical bulb, pseudocystidial contents yellowish to golden brown in KOH, darkening in sulphobenzaldehyde; acanthophyses 25-35 x 7-12 microns, subclavate to clavate, thin-walled, "aculeate-pronged parts borne laterally or apically or both", semisolid, pronged parts "separable, and then in the mount appearing as free-floating fragments", 7-15(18) x 5-10 microns, individual prongs 4-10 x 1-1.5 microns, appearing to advantage in Melzer''s reagent; CONTEXT monomitic, composed of hyphae that are 1.5-3 microns wide, subregular, thin-walled, and clamped, BASAL HYPHAE 3.5-5(6) microns wide, with partially thickened walls, (Lemke)
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