The North American Species of Pholiota

103. Pholiota romagnesiana sp. nov.

Pileus 3-8 cm latus, obtusus demum campanulatus, sordide luteolus, squamulosus. Lamellae confertae, latae, adnatae, pallide luteae. Stipes 6-12 cm longus, 8-14 mm crassus, solidus, connato-cespitosus, squamulosus. Sporae 4-5 x 2.5-3 µ. Pleurocystidia 32-46 x 9-13 µ, clavata vel ellipticopedicellata. Specimen typicum in Herb. Univ. Mich. conservatum est; legit prope Santa Fe N. Mexico, Aug. 1964, Chas. Barrows 1739.

Pileus 3-8 cm broad, obtuse with an incurved margin, expanding to broadly campanulate or nearly plane but with a low obtuse umbo, ground color very pale dingy yellow (near cream color) and with small ochraceous tawny scales over the surface, scales most numerous over disc, scales recurved to appressed (reminding one of those of P. squarrosa). Context as in P. squarrosa but more pliant, taste pleasant, odor pleasant.

Lamellae close, moderately broad, adnate becoming slightly adnexed, cream-buff to slightly yellower (none completely colored by spores).

Stipe 6-12 cm long, about 8-14 mm thick, solid, equal, connate below, surface scaly as in P. squarrosa with dry recurved scales up to the ragged submembranous annulus or fibrillose veil-line, fibrillose-scurfy above the line, concolorous with pileus except for scales and only weakly fulvous at base as dried.

Spores 4-5 x 2.5-3 µ, smooth, no apical pore visible, elliptic to ovate in face view, obscurely bean-shaped to nearly oblong in profile, in KOH dingy ochraceous, in Melzer's reagent nearly hyaline. Basidia 4-spored, 18 x 4 µ, hyaline to yellowish in KOH or Melzer's reagent. Pleurocystidia 32-46 x 9-13 µ, clavate to elliptic-pedicellate or clavate-mucronate, evenly refractive in KOH and Melzer's reagent, or some with an even dull brown content (not typical chrysocystidia). Cheilocystidia similar to pleurocystidia or clavate and thin-walled and up to 18 µ broad. Caulocystidia rare, present as fusoid end-cells of hyphae, 2-4 µ diam.

Gill trama with a gelatinous subhymenium and a hyaline floccose central strand of subparallel hyphae, walls hyaline and smooth. Pileus cutis a layer of narrow (2-4 µ) filaments interwoven, gelatinous and often with yellow content; hypodermial region of greatly inflated hyphal cells nearly colorless and with thin walls. Context hyphae with thickened "double" walls beneath the hypodermium, hyaline, walls smooth, cells mostly inflated. All hyphae inamyloid. Clamp connections present.

Habit, Habitat, and Distribution: Caespitose on a dead conifer stub, Jemez Mountains near Santa Fe, New Mexico, August 1964, Chas. Barrows 1739, type.

Observations: This is a most interesting species identical in aspect with P. squarrosa as it occurs in New Mexico but lacking olive or green tones, lacking a garlic odor, and in having narrower spores than P. squarrosoides. Barrows considers it far superior to P. squarrosa as an edible species. No heliotrope stains were noted anywhere on the basidiocarps, it lacked a fruity odor and occurred on conifer wood. Hence with the data available it cannot be properly referred to Dryophila ochropallida Romagnesi. However, we take pleasure in naming our species in his honor.