Summary:
Also listed in Veined and Crust categories. Features include shelf-like growth in overlapping clusters on hardwoods, reddish brown to yellow brown to tan cap that is dry, tomentose, and somewhat concentrically zoned, whitish to grayish gill-like folds with wavy edges, and small narrow spores.

Cap:
1-2.3cm, shelf-like, in overlapping clusters or groups, "fan-shaped to shell-shaped, concentrically zoned", margin "undulating, lobed, scalloped", downcurved to inrolled; "yellow-orange to reddish brown or yellow-brown", with whitish to pale yellow margin; dry, finely tomentose, (Bessette), 1-2.5cm, shelf-like with lobed margin; yellow-brown to tan; hairy, (Lincoff), individual caps semicircular and flabellate [fan-shaped] or conchate [shell-shaped], with short stem or now and then almost circular with more or less central stem at top; upper surface ocher-brown to red-brown; appressed-tomentose, with concentric zones of undulations; margin undulating [wavy], crenate [scalloped], often lighter in color, often downcurved to inrolled, and often bearing smaller caps 1-2cm across, (Breitenbach), 1-2cm, seldom more, usually dimidiate [semicircular], flabelliform [fan-shaped], or cup-shaped, mostly crowded-imbricate, on underside of wood lying almost flat with spore-bearing surface down, on vertical sides of wood laterally attached; young fruitbody white, but upper side soon pale brown to tobacco brown; finely velvety, often subzonate [somewhat zoned], (Eriksson)

Flesh:
thin, membranous, flexible when moist, hard and brittle when dry, (Bessette), thin, tough, membranous, (Lincoff), when fresh membranous, soft, elastic, when dry brittle and hard, (Breitenbach), when young soft and pliable, when mature firmer, when dried brittle, (Eriksson)

Gills:
gill-like, crimped [with wavy edges], often forked and vein-like, often anastomosing, moderately distant, narrow; whitish to grayish, (Bessette), "gill-like, crimped, typically forked", "sometimes shallow and vein-like, well-separated, narrow"; whitish, (Lincoff), lamellate-venose [gilled-veined], ribs strongly undulating, forked and anastomosing; dingy white to gray-ocherish, (Breitenbach), "folded in dichotomously branched gill-like ridges with uneven - crispate edge"; "white - glaucous white, darkening in old specimens and in the herbarium", (Eriksson)

Stem:
very short, a narrow central to lateral extension of the cap, sometimes absent, (Bessette), without stem or with the fruitbody narrowed into a short pseudostem, (Eriksson)

Odor:
not distinctive (Bessette), none (Breitenbach)

Taste:
not distinctive (Bessette), pleasant and mild (Breitenbach)

Microscopic spores:
spores 3-4 x 1-1.5 microns, sausage-shaped to elliptic, smooth, colorless, often containing 2 droplets, (Bessette), spores 3-4 x 1-1.5 microns, cylindric to narrowly elliptic, (Lincoff), spores 3.5-4 x 1-1.3 microns, cylindric, allantoid, smooth, iodine positive but weak, colorless, with 2 droplets; basidia 4-spored, 12-16 x 3-4 microns, clavate, clamped; cystidia none; hyphal system monomitic, "hyphae of the trama and subhymenium thin-walled and sometimes with cross-banded structure", 3-5 microns wide, "richly branched, septate with large perforated clamps", hyphae of the cap surface thick-walled, all hyphae swell in KOH, (Breitenbach), spores 3-4.5 x 0.75-1.25 microns, exceptionally larger, allantoid, smooth, amyloid reaction distinct to difficult to observe, thin-walled; basidia 4-spored, 15-22 x 3.5-4.5 microns, subclavate, clamped; cystidia none; hyphal system monomitic, hyphae 3-5(7) microns wide with large clamps that often have a conspicuous "eye"; hyphae of trama 3-5 microns wide, coarse, thick-walled, swelling in KOH or Melzer''s reagent, ends of such hyphae form the tomentum on the upper side, in old fruitbodies these more or less glued together into bristles, (Eriksson)

Spore deposit:
white (Bessette)

Notes:
Plicaturopsis crispa has been found in BC, AB, NB, NF, NS, ON, PQ, YT, AK, IA, MI, MN, MT, NY, and WI, (Ginns). It is reported from eastern WA (Andrew Parker, pers. comm.), ME, ND, and TN, (Lincoff), and Denmark, Finland, Norway, and Sweden, (Eriksson).

EDIBILITY

inedible (Bessette)

Synonyms and Alternate Names:
Plicatura crispa (Pers.: Fr.) Rea
Plicatura faginea (Fr.) P. Karst.
Polyporus collabens Fr.
Poria rixosa P. Karst.
Trogia crispa (Pers.) Fr.