Summary:
Mycoacia nothofagi is distinguished particularly by soft, brittle teeth and abundant, thick-walled, encrusted cystidia (Nakasone(11) who says it is variable in form and color but shows little variation in microscopic characters). Other features include flat growth on hardwoods, a somewhat waxy surface with soft white membranous flesh, the surface color shades of brown, orange-brown, orange, gray-brown, or yellowish brown, often darker between and at base of teeth, the teeth 0.1-0.6cm long and glaucous to velvety, the margin of the fruitbody lighter in color. The description is derived from Nakasone(11).
Collections were examined from BC, WA, ID, CA, DC, FL, LA, MT, NC, NY, TN, WI, Azerbaijan, Macedonia, Czech Republic, France, Georgia, Germany, Russia, Slovak Republic, Spain, Switzerland, United Kingdom, Australia, and New Zealand, (Nakasone(11) who says also reported from Portugal, Romania, and Thailand).
Fruiting body:
resupinate (flat on wood with spore-bearing surface facing outwards), "beginning as small coalescing, circular patches that become widely effused" [spread out], up to 15cm x 7cm, moderately thick, up to 0.1cm thick, surface layer subceraceous [somewhat waxy], up to 0.01cm thick, with infrequent cracks exposing the white, soft, felty, fibrous-membranous context layer that is up to 0.053cm thick, spore-bearing surface spinose, 1-2 teeth per millimeter, "occasionally smooth with scattered teeth", the teeth in cross-section round to flattened, "single, fused at base or laterally throughout length, gradually tapering toward apex", 0.1-0.6(1)cm long and 0.1cm wide at base, "soft, brittle, with an overall glaucous and velutinous appearance from protruding cystidia, apices acuminate, entire or blunt and tufted"; color of surface "variable, typically darker between and at base of teeth", brown, then becoming brownish orange, light brown, grayish brown, light orange, grayish orange or yellowish brown toward apex, sometimes brownish orange or brown throughout; margins "typically distinct, ropy, abrupt, closely appressed, adherent", 0.2-0.4cm wide, sterile, lighter in color than spore-bearing surface, pale yellow, light yellow, pale orange, light orange to grayish orange, "odontoid to warted or with ridges, edges deeply lacinate and incised or sometimes indistinct, thinning out"; "light colored specimens turning pinkish red to dark brown in KOH"
Microscopic:
SPORES (4.5)5-5.5(6) x 2.2-2.5(2.9) microns, elliptic, "adaxial side straight or slightly concave", smooth, inamyloid, the walls colorless, thin, distinct; BASIDIA 4-spored, 20-32(36) x 4-6 microns, clavate, tapering to 2-2.5 microns wide at base, with basal clamp connection; CYSTIDIA of two types 1) tramal - fusiform, rarely cylindric, with a long stalk, up to 180 microns long, 3.5-8(14) microns wide including crystals, tapering to 3.5-4 microns wide at base, with basal clamp connection, "often with secondary septa, apex acute to rounded", walls colorless to yellowish brown, "thin throughout but sometimes slightly thickened at distal end, smooth or lightly to moderately encrusted at apex" with colorless, "loosely adherent, coarse, crystalline materials", "originating in subiculum or tooth trama, often curving into subhymenium and hymenium", becoming embedded or protruding up to 55 microns beyond the hymenium, "also extending into tooth apex, numerous in tooth trama", 2) hymenial - cystidia fusiform, 35-90 x 5-7 microns, tapering to 1.5-2.5 microns wide at base, with basal clamp connection, walls colorless, slightly thickened, up to 0.1cm thick, but often thinning at base, "basal part smooth, distal part lightly to moderately encrusted" with closely adherent, colorless crystalline materials, "embedded or protruding" up to 45 microns, "arising from subhymenium, numerous in subhymenium and hymenium"; HYMENIUM "a dense palisade of basidia and cystidia, not agglutinated but difficult to separate individual elements, occasionally interspersed with clumps of reddish brown, resinous materials"; SUBHYMENIUM thickening, 25-80 microns thick between teeth and near apices of teeth, up to 300 microns thick at base of teeth, "hyphae oriented perpendicular to substrate or to long axis of teeth, dense, compact, agglutinated, often indistinct and collapsed", hyphae 2-3.5 microns wide, nodose-septate, "frequently branched, conglutinate, short-celled", walls colorless, thin, smooth; TOOTH HYPHAE - teeth with "central core of vertically arranged, parallel, subicular hyphae that may be smooth or encrusted, and smooth or encrusted cystidia enclosed by subhymenium and hymenium", sometimes with elongate clusters of acerose or flattened, colorless crystals and resinous materials, "often with cystidia protruding at apex and through hymenium"; SUBICULUM of smooth areas between teeth up to 900 microns thick, "sometimes stratose, with a very thin, yellow-orange basal layer", up to 50 microns thick, "of agglutinated hyphae arranged parallel to substrate and a thicker layer of non-agglutinated hyphae, first arranged more or less parallel to substrate in a loose, open textura intricate that develops into a dense vertical palisade near subhymenial interface", hyphae 2.5-5.5 microns wide, rarely orange, nodose-septate, "sparingly to moderately branched, often branching from clamps and forming H-connections", walls colorless, "thin to slightly thickened, smooth"; HYPHAE monomitic
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