Name: Stropharia acanthocystis Cortez & R.M. Silveira
Version: 1

First person to use this name on MO: Erlon Bailey

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Rank: Species

Status: Accepted

Name: Stropharia acanthocystis

ICN Identifier: missing

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Author: Cortez & R.M. Silveira

Citation: Mycologia 99(1): 135 (2007)


Domain: Eukarya

Kingdom: Fungi

Phylum: Basidiomycota

Class: Agaricomycetes

Order: Agaricales

Family: Strophariaceae

Genus: Stropharia

Brief Description: [See More | Edit]

Pileus 17-40 mm diam., convex, umbonate, reddish brown (2.5YR 4/4), red (2.5YR 4/6) to yellowish red (5YR 4/6); surface slightly moist, cottony toward the margin, especially in younger basidiomata, due to the presence of whitish floccose remains; margin non-striate, slightly involute, with abundant appendiculate velar remnants; context white to cream-color, fleshy and soft, 5-7 mm thick. Lamellae adnexed, close, light gray (2.5Y 7/1-7/2) to pale brown (10YR 6/3) in mature basidiomes, with a paler margin. Stipe 23-62 — 4-9 mm, central, cylindrical, but sinuous to curved, pale yellow (2.5Y 8/2-8/4) with white or pale lilaceous tones; surface longitudinally striate, dry to moist; base expanded, with abundant white rhizomorphs; annulus absent. Veil not forming an annulus, but leaving abundant remnants appendiculate in the pileus margin, with a membranous consistency, pale yellow (2.5Y 8/2-8/3). Spore print dark brown (10YR 3/3) to dark yellowish brown (10YR 3/4).
Basidiospores 6-7 (-8) — 4-5 µm, Q = 1.33-1.75, Qm = 1.51, n = 50, ovoid to ovoid-ellipsoid in face view to reniform or subellipsoid in side view, smooth and thickened wall, with a reduced germ-pore, yellowish brown in KOH. Basidia 20-28 — 7-9 µm, clavate, thin-walled, bearing four sterigmata. Pleurocystidia (23-) 26-33 (-41) — 8-10 (-11) µm, as chrysocystidia, clavate, very rarely with a mucronate apex, smooth and thin-walled, with an amorphous yellow content in KOH. Cheilocystidia (18-) 22-33 — 10-15 (-18) µm, as leptocystidia, mainly pyriform, some clavate, with a smooth but slightly thickened wall, hyaline; very abundant, making the gill edge sterile. Pileipellis composed by non-gelatinized clamped hyphae (5-) 8-10 (-13) µm diam., with their walls slightly thickened and incrusted, yellowish brown. Context formed by interwoven, hyaline, thin-walled and clamped hyphae 6-13 µm diam. Gill trama regular, with hyaline, thin-walled, cylindrical to inflated hyphae (6-) 7-12 µm diam. Stipitipellis composed by hyaline, non-gelatinized, thin-walled hyphae 6-12 µm diam. Caulocystidia of three types: 1) chrysocystidia 22-28 — 9-12 µm, clavate, similar to the pleurocystidia; 2) leptocystidia 23-45 — 8-15 µm, clavate, similar to the cheilocystidia; 3) acanthocytes similar to those in the hymenium. Acanthocytes present in the hymenium, mixed with basidia and cystidia (including the cheilocystidia), in the form of cystidioid structures; composed of a basal and clamped hyphae, from which arises 7-11 thick-walled rays. Clamp connections present.

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