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

Aleurodiscus penicillatus Burt
no common name
Stereaceae

Species account author: Ian Gibson.
Extracted from Matchmaker: Mushrooms of the Pacific Northwest.

Introduction to the Macrofungi

© Adolf Ceska  Email the photographer   (Photo ID #19185)

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Distribution of Aleurodiscus penicillatus
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Species Information

Summary:
features include 1) resupinate growth on dead branches and twigs of conifers especially Douglas-fir and Western Hemlock, 2) corticioid patches up to 0.3cm across which become confluent, color light buff to cream-buff, margin distinct and tightly attached, 3) round to suboval spores that are amyloid with spiny surface in Melzer's reagent, with germ pores at opposite ends of the spore, 4) catahymenium composed of a) basidial elements, b) simple paraphysoids, c) ampulliform pseudocystidia (often with a conspicuous globe-like mass inside, and bearing one or more asexual propagules at tip), and d) numerous, thin-walled acanthophyses with delicate acicular projections toward the apex, and 5) context monomitic with clamp connections; recorded from BC, WA, OR, ID, also ON, PQ, CA, NH, NY, NC, VT, (Ginns), collections examined from BC, OR, ID, ON, PQ, CA, NY, VT, (Lemke)
Fruiting body:
corticioid, at first in separate patches, 0.2-0.3cm across, "readily confluent, forming irregularly effused areas", 0.02-0.04cm thick, in western North America up to 0.07cm thick, "texture granular-pruinose to compact-pulverulent"; light buff to cream-buf
Microscopic:
SPORE 15.5-20(25) x (13)14-19(21) microns, round to suboval, flattened adaxially, walls appearing smooth to roughened in KOH, echinate [spiny] in Melzer's reagent, walls amyloid, "thickened at maturity up to 2 microns thick, and then bearing opposite germ-pores at the poles of the spore"; spores of fruitbodies from Picea sitchensis with a larger average spore range, 22-25 x 15-21 microns; catahymenium composed of basidial elements, simple paraphysoids, ampulliform pseudocystidia, and numerous, thin-walled acanthophyses; BASIDIA (2)4-spored, 55-90(110) x 16-24 microns, clavate, thin-walled, often with lateral acicular prongs, sterigmata 14-19 microns long, 4-5 microns wide at base, subulate, slightly incurved; PARAPHYSOIDS (1.5)2-2.5 microns wide, simple to branched, hyphal-like; PSEUDOCYSTIDIA embedded at first, (35)50-60(75) x (9)10-12 microns, flexuous-cylindric to emergent-ampulliform, bearing one to several apical gemmae [asexual propagules], contents of pseudocystidia often "with a conspicuous globoid, hyaline in KOH, not darkening in sulphobenzaldehyde"; ACANTHOPHYSES 20-100 x 5-20 microns, cylindric to broadly clavate, uniformly thin-walled, bearing scattered, delicate, acicular prongs mostly toward apex, the individual prongs seen to advantage in Melzer's reagent, 3-7 microns long and about 0.7 microns wide; CONTEXT monomitic, composed of hyphae that are 2-2.5(3) microns wide, subregular, branched, thin-walled, and clamped, (Lemke)

Habitat / Range

on dead branches and twigs of various conifers, in the Pacific Northwest occurring commonly on Pseudotsuga menziesii (Douglas-fir) and Tsuga heterophylla (Western Hemlock), (Lemke)

Taxonomic and Nomenclatural Links

Additional Range and Status Information Links

Additional Photo Sources

Related Databases

Species References

Lemke(1), Ginns(5)

References for the fungi

General References