The North American Species of Pholiota

99. Pholiota penningtoniana sp. nov.

Illustrations: Text figs. 196-198.

Pileus 3-9 cm latus, convexus, squarroso-squamulosus, ad centrum fulvus, ad marginem subluteus (in siccatis). Lamellae confertae, angustae, subdecurrentes, luteae demum subfulvae; stipes 9-12 cm longus, 8-15 mm crassus, aequalis, squamosus, sursum subluteus, deorsum pallide fulvus. Sporae 6-7.5 x 4-4.8 (5) µ, leves. Chryso-pleurocystidia 33-52 (68) x 7-12 (15) µ, clavato-mucronata. Specimen typicum in Herb. Univ. of Mich. conservatum est; legit prope Marquette, Mich. 29 Aug. 1906. L. H. Pennington.

Pileus 3-9 cm broad, convex expanding to broadly umbonate, surface dry and recurved-squamulose as in P. squarrosa, possibly subviscid in age, color pale tawny on disc, yellowish over marginal area (as dried).

Lamellae crowded, narrow, subdecurrent, yellowish becoming subfulvous (as dried). Stipe 9-12 cm long, 8-15 mm thick, equal, covered below the apical fibrillose annulus with recurved dry squamules, base of stipe pale tawny.

Spores 6-7.5 x 4-4.8 (5) µ smooth, apical pore none or exceedingly small; shape in face view broadly ovate to elliptic, in profile obscurely bean-shaped to elliptic; wall thin (-0.25 µ); color in KOH dull cinnamon, paler to nearly the same color in Melzer's reagent.

Basidia 18-23 x 5.5-6.5 µ, clavate, yellowish in KOH and in Melzer's reagent. Pleurocystidia numerous and prominently projecting 33-52 (68) x 7-12 (15) µ, clavate, clavate-mucronate, or fusoid-ventricose, content evenly refractive as in P. squarrosoides (relatively few with a highly refractive inclusion and hence typical for chrysocystidia); color in Melzer's reagent evenly yellowish, in KOH refractive-hyaline or some with bright ochraceous content and connected to laticiferous elements with the same colored content, walls thin, smooth and hyaline. Cheilocystidia 28-37 x 6-11 µ, clavate, utriform, or fusoid-ventricose, with hyaline to yellow content in KOH, walls tlin and smooth content, homogeneous. Caulocystidia scattered as clavate cells 29-48 x 8-12 µ, thin-walled, smooth, content homogeneous.

Gill trama with a floccose central area flanked on either side by a subgelatinous subhymenium. Pileus cutis with a subgelatinous layer (as a subcutis), the hyphae 3-5 µ and yellowish in KOH; hypodermium not differentiated. Context hyphae hyaline to yellowish in KOH, walls thin and becoming inflated. Clamp connections present. All hyphae inamyloid.

Habit, Habitat, and Distribution: Caespitose at base of tree, Marquette, Michigan. Aug. 29, 1906. L. H. Pennington, type.

Observations: The specimens were identified as P. squarrosoides by Kauffman, but as dried almost exactly resemble in color and markings those of P. squarrosa. The subcutis is merely subgelatinous-an intermediate state between the two species already mentioned. The spore shape, however is not typical of either. The pleurocystidia are much larger than in P. rigidipes.