The North American Species of Pholiota

81. Pholiota melliodora sp. nov.

Illustrations: Text figs. 110-112.

Pileus 1-8 cm latus, convexus, melleus, viscidus, virgatus. Caro fragilis, mollis, lutea, odor fragrans. Lamellae adnatae, confertae, latissimae, luteae. Stipes 4-7 cm longus, 3-7 mm crassus, flexuosus, fibrillosus, luteus, deorsum subfulvus. Sporae 5.5-7.5 x 3.5-4 µ. Pleurocystidia 28-37 x 9-12 µ, ovata veil elliptico-pedicellata, ochracea. Caulocystidia 24-48 x 3-7 µ. Specimen typicum in Univ. Mich. Herb. conservatum est.; legit prope Portland, Ore., 2 Nov. 1957, R. Oswald.

Pileus 1-8 cm broad, convex, near honey-yellow, viscid, fibrillose, at first the margin appressed to stipe, finally expanding. Context brittle, soft, thick on disc, yellow; odor like honey. Lamellae adnate, notched near stipe, yellow, up to 13 mm broad at broadest point, crowded, edges eroded.

Stipe 4-7 cm long, 3-7 mm thick, flexuous, fibrillose, yellow, darkening toward the base, apex enlarged.

Spores (5.5) 6-7.5 x 3.5-4 µ, smooth, apical pore distinct but apex not truncate; shape oblong in face view varying to elliptic, in profile obscurely inequilateral to subelliptic or obscurely bean-shaped; in KOH pale tawny and in Melzer's reagent paler.

Basidia 18-22 x 4.5-6 µ obese, 4-spored, yellowish to hyaline in KOH, yellowish in Melzer's reagent and with numerous yellowish globules. Pleurocystidia scattered, imbedded, 28-37 x 9-12 µ, subglobose, ovate in optical section or elliptic, with a short pedicel; with granular-reticulate ochraceous content in KOH, thin-walled, some debris adhering on wall, the content darker (yellow-brown) in Melzer's than in KOH. Cheilocystidia versiform, 24-48 x 3-7 µ, contorted-filamentous, filamentous-capitate, narrowly fusoid-ventricose, or any of these shapes proliferating at apex (see figs.), walls thin to slightly thickened (-0.5 µ), yellowish in KOH, smooth, content homogeneous. Caulocystidia resembling the cheilocystidia or greatly elongate-subcylindric with a slight thickening of the wall at obtuse apex (50 x 5 µ ±), smooth, content homogeneous.

Gill trama of subparallel floccose hyphae with greatly elongated cells 5-12 µ wide; walls thin, yellowish in KOH, smooth; subhymenium a gelatinous zone of interwoven narrow (2-3 µ) hyaline hyphae. Pileus cutis a gelatinous pellicle of narrow ochraceous hyphae; hypodermial region of rusty to yellowish-tawny hyphae with smooth to slightly incrusted walls. Context hyphae interwoven, cells greatly inflated, walls smooth and yellowish in KOH. Clamp connections present. All hyphae inamyloid.

Habit, Habitat, and Distribution: Caespitose, on soil and near buried wood, Oregon, October-November.

Observations: This is distinguished by its honey odor and its pileus with an incurved margin. It is close to P. ornatula, which has smaller cheilocystidia and subdistant, pallid gills. The pleurocystidia are not typical chrysocystidia but because of their distinctive content would have to be classified there in a broad sense of the term. Apparently the cheilocystidia may proliferate more than once as several were seen in which it was thought that at least 3 stages could be seen.

Material Examined: OREGON. Smith 68780, 68781 (type, from Portland, collected by Ruth Oswald, November 2, 1957).