The North American Species of Pholiota

104. Pholiota angustifolia nom. nov.

Hebeloma appendiculatum Murrill, North Amer. Fl. 10: 220. 1917.
(non. Pholiota appendiculata Peck 1905).

Illustrations: Text figs. 208-210.

Pileus about 5 cm broad, convex, rather thick and fleshy and not fully expanding, slightly gibbous in some, surface viscid, silky and also finely imbricate-squamulose, rosy-isabelline (pinkish-cinnamon), cremeous on the disc, margin deflexed, concolorous, appendiculate with triangular fragments of the slight evanescent veil. Context white, thick at the center; taste nutty.

Lamellae sinuate, broad behind and tapering in front, narrow, arcuate, very crowded, pale cream-color and not darkening on drying, the edges pallid and distinctly crenate or dentate.

Stipe more or less 4 cm long, 1 cm thick, equal, spongy-stuffed, with creamy white pith, glabrous at apex, white above, concolorous below, revolute-squamulose.

Spores 5-6.5 (7) x 3.3-4 (4.5) µ smooth, apical pore distinct but minute and apex not truncate, shape in face view ovate to elliptic or nearly oblong, in profile slightly bean-shaped to somewhat inequilateral; color revived in KOH ochraceous to cinnamon-buff, in Melzer's reagent about the same color; wall thin (-0.25 µ).

Basidia 15-20 (22) x 4.5-6 µ, 4-spored, obese, hyaline to yellowish in KOH and Melzer's reagent. Pleurocystidia numerous 20-28 x 6-12 µ, clavate-mucronate to fusoid-ventricose, apex obtuse, wall thin, smooth and hyaline; content refractive and reticulate or contracted into a more or less distinct refractive body, hyaline in KOH and merely yellowish in Melzer's reagent. Cheilocystidia (17) 25-40 (50) x 7-10 (15) µ, cylindric-capitate, ninepin-shaped, fusoid ventricose to utriform, smooth, thin-walled; content homogeneous and hyaline in KOH. Caulocystidia none.

Gill trama with central area of floccose subparallel hyphae hyaline to pale fulvous in KOH in sections, walls thin and smooth, cells 4-9 µ broad; subhymenium a distinct gelatinous zone. Pileus cutis a thin layer of hyaline subgelatinous hypha 3-5 µ diam. over the surface but no well organized typical gelatinous pellicle found; hypodermial region differentiation as to color or structure. Context hyphae hyaline, interwoven, the cells inflated and with thin smooth walls. Clamp connections present but rare and difficult to demonstrate. All hyphae inamyloid.

Habit, Habitat, and Distribution: Caespitose on soil, at the base of a sugar maple, New York, September. Type studied.

Observations: In this species we again have a "stage" in the development of the typical chrysocystidium in that the content of the cell is not organized (as revived in KOH) into a sharply delimited refractive inclusion but involves in most cells the shrunken coagulated total cell content. The spores and gelatinous subhymenium clearly remove the species from Hebeloma where it was described, and, along with the veil features, indicate Pholiota as the correct genus. It is very doubtful if the color of the spore deposit is purplish, but on this point we have no data. Under the microscope the color of the spores is more ochraceous than usual for a Pholiota, indicating that yellow tints probably would be prominent in a deposit.

Material Examined: NEW YORK: Murrill (type, of Hebeloma appendiculatum on lawn, New York Botanical Garden, September 4, 1912).