The North American Species of Pholiota

201. Pholiota lurida sp. nov.

Illustrations: Text figs. 458-462.

Pileus 3-7 cm latus, se expandens, margine "cartridge-buff," vel "cream-color," disco "tawny." Caro flavido-alba; odore et gustu mitis vel tenuis. Lamellae adnatae demum adnexae, pallido-flavae, subdistantes, medio-latae. Stipes 4-9 cm longus, 4-9 mm crassus, supra albus, infra brunnaceus, fibrillosus. Velum arachnoideum, album. Sporae 5.5-7 x 3-3.7 µ, ellipsoideae demum ovoideae, leves. Pleurocystidia 49-68 x 9-15 µ, ventricosa; cheilocystidia 28-47 x 9-4 µ, ventricosa, subellipsoidea, obclavata. Cuticula gelatinosa. Caulocystidia fasciculata, clavata, fusoidea, ventricosa. Specimen typicum in Herb. Univ. Mich. conservatum est; lectum prope Pellston, Michigan, 30 Sept. 1962. Smith 66386.

Pileus 3-7 cm broad, convex with an incurved margin, expanding to broadly convex or nearly plane, "cartridge-buff" to "cream-color" on margin, more or less ochraceous tawny on disc, marginal area streaked with agglutinated fibrils or nearly glabrous, margin for a time decorated with a fringe of pallid veil fibrils. Context yellowish white; odor none, taste slight; in FeSO4 instantly olive, flesh and cutis with KOH instantly yellow to finally tawny brown.

Lamellae adnate to adnexed, yellowish pallid, nearly subdistant, moderately broad, edges becoming uneven.

Stipe 4-9 cm long, 4-9 mm thick, whitish above, soon dull rusty below from handling, equal, to slightly enlarged downward, cartilaginous, hollow, lower half fibrillose from veil, but not leaving a distinct annulus, scurfy above. Veil arachnoid, whitish.

Spores 5.5-7 x 3-3.7 µ, smooth, apical pore very minute (under 1.4 N.A.) to absent, shape in face view suboblong to ovate, in profile obscurely inequilateral; color pale tawny in KOH, nearly hyaline in Melzer's reagent; wall less than 0.25 µ thick (estimated).

Basidia 4-spored, 18-25 x 4.5-6 µ, clavate, hyaline in KOH. Pleurocystidia 42-58 (68) x 9-15 µ, fusoid-ventricose with obtuse apex to utriform, thin-walled, content ochraceous to rusty brown but slowly hyaline in KOH (or hyaline from the beginning), wall thin and smooth. Cheilocystidia 28-47 x 9-14 µ, subfusoid to utriform or clavate, smooth, thin-walled. Caulocystidia numerous over apex of stipe, in rosettes, versiform, fusoid, clavate, vesiculose, or ventricose above and below a median constriction, pedicel often greatly elongated, apex in any of above types may be drawn into a filamentous crooked prolongation 3-6 µ diam., walls thin smooth and hyaline or some of the vesicular elements golden yellow.

Gill trama with a distinct gelatinous subhymenium and a floccose central strand of subparallel hyphae 4-8 µ broad, and walls hyaline to pale tawny in color. Pileus cutis a gelatinous pellicle of narrow (2-5 µ) ochraceous smooth to encrusted hyphae, hypodermium of rusty brown floccose hyphae. Clamp connections present. All hyphae inamyloid.

Habit, Habitat, and Distribution: Scattered on debris, among fallen aspen, Michigan, September; Smith 66386, type.

Observations: The pale, although rather bright, buff to cream-color margin and the tawny disc make it a striking agaric. The flesh, gills, and stipe are likewise pale, and the veil white. In addition, the stipe base is also pallid, but becomes dull rusty from handling. The caulocystidia are in rosettes and are rather striking in form.