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

Aleurodiscus aurantius (Pers.: Fr.) J. Schroet.
no common name

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

Introduction to the Macrofungi

© Adolf Ceska  Email the photographer   (Photo ID #19186)

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Distribution of Aleurodiscus aurantius
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Species Information

Features include 1) growth on twigs and stems of species of Rosaceae, 2) fruitbodies as patches that are palish with orange tinges, thin and leathery, and often pruinose, 3) spores that are oval to oval-elliptic, amyloid, and finely spiny, 4) a catahymenium composed of a) a loose network of basidial elements, b) naked dendrohyphidia (may be covered with crystals), and c) abundant yellowish pseudocystidia (macrocystidia) of a deep origin, and 5) a monomitic context without clamp connections.

Aleurodiscus aurantius has been recorded from BC, ON, and CA, (Ginns). It occurs in Europe including Denmark, Norway, and Sweden, (Eriksson). Collections were examined from BC, CA, France, Germany, Norway, and Sweden, and the range includes South America, Japan, and New Zealand, (Lemke).
Fruiting body:
0.01-0.03cm thick, effused (spread out on substrate), closely attached, consistency subcoriaceous (somewhat leathery); "palish with orange tinges"; usually smooth; without distinct margin, (Eriksson), corticioid, in resupinate patches 0.5-1.5cm wide, 0.015-0.0375cm thick, sometimes coalescing to form wider areas, texture densely pruinose to compact-submembranous; color variable, drying isabelline to cinereous, or even fuscous; drying rimose [cracked] to continuous; margin at first indeterminate [indistinct], adnate [tightly attached], fimbriate [fringed], and lighter in color, becoming more distinct and colored like the rest of the surface, (Lemke), spore deposit white (Buczacki)
SPORES about 20 x 13 microns, elliptic to nearly round, finely echinulate (spiny), amyloid; BASIDIA 4-spored, about 60 x 15 microns, sterigmata about 15 microns long; DENDROHYPHIDIA numerous, richly branched and covered with crystals; PSEUDOCYSTIDIA "variable in shape, narrowly paraphysoid with rounded apex, or wider and more rounded, tapering basally to a long shaft with a +/- moniliform apex, or even smooth to simply tapering", cell contents yellowish (darken in sulfovanillin), making pseudocystidia easy to separate from basidia; HYPHAE monomitic with hyphae 2.5-4 microns wide, simple-septate, thin-walled, in an open texture, (Eriksson), SPORES (14)16-20(22) x (10)12-15(16) microns, oval to oval-elliptic, "apiculate, flattened adaxially, firm-walled, finely echinulate in Melzer''s, amyloid"; catahymenium composed of a loose network of basidial elements, naked dendrohyphidia, and abundant pseudocystidia (macrocystidia) of a deep origin; BASIDIA 4-spored, (30)50-70(80) x 10-14 microns, cylindric to flexuous-subclavate, sterigmata divergent and up to 20 microns long and 4 microns wide at base; PSEUDOCYSTIDIA embedded, (30)40-60 x 12-20 microns, variable, mostly ampulliform with one to several apical constrictions, contents yellow brown in KOH, PARAPHYSOIDS 2-2.5 microns wide, hypha-like, "without clamps, simple to branched, forming a mass of naked dendrohyphidia at the level of the hymenium"; HYPHAE monomitic, of hyphae 2.5-4 microns wide, simple-septate, thin-walled, branched, (Lemke)

Habitat / Range

on dead twigs and stems, in Europe primarily on Rosaceae, in BC a collection from Vaccinium, in California from Arctostaphylos columbiana (hairy manzanita), Rhododendron occidentalis (western azalea), Ribes sanguineum (redflower currant), Rubus ursinus (Pacific blackberry), Umbellularia californica (California laurel), Notholithocarpus densiflorus (Tanoak), (Lemke), also recorded from Tsuga (hemlock), (Ginns), usually on Rosaceae, but recorded from Taxus (yew), (Eriksson for North Europe), fall, winter, spring, (Buczacki)

Taxonomic and Nomenclatural Links

Genetic information (NCBI Taxonomy Database)
Taxonomic Information from the World Flora Online
Index Fungorium
Taxonomic reference: in F. Cohn, Kryptogamen-Flora Schlesien 3(1): 429. 1888

Additional Range and Status Information Links

Additional Photo Sources

Related Databases

Species References

Lemke(1), Eriksson(2), Ginns(5), Buczacki(1)*

References for the fungi

General References