Mycoacia uda (Fr.) Donk
no common name
Meruliaceae
Species account author: Ian Gibson.
Extracted from Matchmaker: Mushrooms of the Pacific Northwest.
Introduction to the Macrofungi
no common name
Meruliaceae
Species account author: Ian Gibson.
Extracted from Matchmaker: Mushrooms of the Pacific Northwest.
Introduction to the Macrofungi
Species Information
Summary:
Features include 1) resupinate growth on the underside of dead branches and trunks of hardwoods, 2) dense spines that are waxy, yellow to ochraceous, the tip usually smooth, the margin of the fruitbody with smaller spines and ending smoothly, sometimes pruinose or rather fringed, 3) the young yellow parts of the fruitbody turning deep red with drops of KOH, 4) narrowly elliptic spores that are smooth and inamyloid, 5) cystidia present as small subfusiform cystidioles somewhat projecting beyond the hymenium, and 6) a monomitic hyphal system, the hyphae with clamp connections.
Microscopic:
SPORES 5-6 x 2-2.5 microns, narrowly elliptic, smooth, inamyloid, acyanophilic, thin-walled, often with 1-2 small oil droplets; CYSTIDIA present as small cystidioles, about 25 microns long, subfusiform, "somewhat projecting and apically provided with a cap of non-crystalline matter, easily dissolved in mounting media"; HYPHAE monomitic, hyphae 2-3 microns wide, with clamp connections, "with thin or slightly thickened walls", packed in parallel fashion in the aculeal trama, "subhymenial hyphae densely intertwined"; "in mature specimens aculeal trama filled with rod-like crystals, in old specimens often united to larger lumps", "in such specimens apical hyphae end more or less encrusted", (Eriksson), SPORES 5-6 x 2-3 microns, oval, smooth, inamyloid, colorless, with 1-2 droplets; BASIDIA 4-spored, 15-20 x 4-5 microns, narrowly clavate; CYSTIDIA inconspicuous, 20-25 x 4 microns, fusiform; HYPHAE monomitic, 2-3 microns wide, some with clamp connections; CRYSTALS in the trama of the aculei, (Breitenbach)
Notes:
Mycoacia uda has been found in BC, WA, OR, MB, ON, IA, IN, LA, MI, MT, NY, TN, and WI, (Ginns(5)). Distribution includes BC, WA, OR, ID, MB, ON, QC, IA, IL, MT, NY, SD, TN, VA, WI, Armenia, Austria, Azerbaijan, Czech Republic, Denmark, Estonia, France, Georgia, Germany, Italy, Netherlands, Russia, Spain, Sweden, and Turkmenistan, (Nakasone(11) who says also reported from Portugal, Turkey, Iran, Ethiopia, and Morocco). Distribution includes Switzerland (Breitenbach), and Denmark, Finland, Norway, and Sweden, (Eriksson).
Habitat and Range
SIMILAR SPECIES
Mycoacia fuscoatra has a pale yellow to ochraceous spore-bearing surface that stains red to purple in KOH on the yellow parts, and its spores are subcylindric and only 1.7-2.5 microns wide, whereas M. uda has a distinctly yellow spore-bearing surface, the yellow parts staining red in KOH, and spores are narrowly elliptic and 2-3(3.2) microns wide, (Ginns(23)). In M. fuscoatra 1) mature fruitbodies are dark brown to almost black rather than ochraceous as in M. uda, 2) apical hyphae are strongly encrusted, conspicuous, and cystidia-like in mature specimens (in M. uda encrusted hyphae if present are few and inconspicuous), 3) cystidioles are acicular, whereas those of M. uda are short, and not acicular, and 4) yellow, oily bodies are present in cotton-blue, (Eriksson). Mycoacia aurea does not stain in KOH, (Ginns(23)). M. aurea 1) does not stain red in KOH when young like M. uda, 2) has spores that are shorter and suballantoid, and 3) normally lacks cystidioles, (Eriksson). Mycoacia austro-occidentale Canf., found in Arizona, is pale buff to cream, with spores measuring 4.0-4.5 x 2.0-2.5 microns, (Ginns(23)). Mycoacia is separated from other resupinate, odontioid fungi by its wax-like consistency, (Breitenbach).Habitat
on "underside of dead branches and trunks of hardwoods, with and without bark", throughout the year but matures only in the summer half, (Breitenbach), on much decayed hardwood, (Eriksson), Acer (maple), Alnus (alder), Arbutus (madrone), Cytisus scoparius (broom), Fagus (beech), Fraxinus (ash), Populus, Pseudotsuga (Douglas-fir), Quercus (oak), Salix (willow); associated with a white rot, (Ginns)
Status Information
Synonyms
Synonyms and Alternate Names:
Coriolellus cuneatus Murrill
Coriolus washingtonensis Murrill