First person to use this name on MO: walt sturgeon
Pileus 39-68 mm diam., initially campanulate, becoming flattened, with a low and broad umbo, very dark grayish brown (10YR 3/2), slightly darker in the centre than margin; surface viscid and smooth; margin regular, non-striate, with appendiculate whitish yellow velar remnants; context fleshy and soft, white. Lamellae adnate, with decurrent tooth, close, at first gray (10YR 5/1) then reddish black (2.5YR 2.5/1) at maturity, margin regular and conspicuously white. Stipe 70-111 — 7-9 mm, central, cylindrical to clavate, with a little expanded base, slightly incurved, white (5Y 8/1) at the apex to pale yellow (5Y 8/2) toward the base; surface dry to slightly fibrillose, striate above the annulus; fistulous, with numerous white rhizomorphs. Veil present on the pileus forming membranous, yellow to white remnants appendiculate on the margin, and on stipe it produces a fleshy, grooved annulus, white below and violaceous on the upper surface. Spore print not seen.
Basidiospores (10.5-) 12-13 — (6.5-) 7-8 (-8.5) µm, Q = 1.44-1.79, Qm = 1.64, n = 53, ellipsoid to slightly ovoid in both side and face view, smooth and thick-walled, with a conspicuous germ-pore making the apex truncate, dark brown in KOH. Basidia 28-37 — (8-) 10-11 µm, subclavate, bearing four sterigmata. Pleurocystidia (31-) 38-47 (-54) — 9-12 µm, as chrysocystidia, fusoid to clavate, with a long mucronate to rostrate apex, smooth and thin-walled, with yellow amorphous content in KOH. Cheilocystidia of two types: 1) chrysocystidia: (26-) 34-42 (-51) — 9-12 µm, fusoid, with a rostrate to mucronate apex, with yellow internal incrustation; 2) leptocystidia: (26-) 30-40 (-44) — (6-) 8-11 µm, lageniform, cylindrical or fusoid, with subcapitate apex, without contents, hyaline, smooth and thin-walled. Pileipellis formed of radially disposed hyphae, strongly gelatinized, hyaline, ramified, with smooth and thin walls (5-) 8-11 (-14) µm diam. Context composed of interwoven, hyaline, smooth and slightly thick-walled hyphae (7-) 8-11 (-14) µm diam. Gill trama regular, composed of inflated hyphae, (5-) 8-12 µm diam., with smooth and slightly thickened walls. Stipitipellis composed of parallel, smooth and thin-walled hyphae 4-8 µm diam. Caulocystidia (16-) 26-37 (-57) — (6-) 8-11 (-13) µm, as leptocystidia, without yellow contents, very variable in shape: clavate, cylindrical, lageniform, utriform to pyriform, capitate or not, hyaline, with smooth and thin walls, numerous on the stipe apex. Acanthocytes present in the rhizomorphs. Clamp connections present at most septa.