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Summary: features include small size, pale convex cap, absent ring but slight evidence of veil at cap margin when young, and dark brown spore deposit; var. platysperma has larger spores, and frequently watery spots or streaks on cap; Breitenbach(4) give this species as a synonym of Agrocybe semiorbicularis (Bull. ex St. Am.) Fay., but Watling describes them separately; Arora's description is for A. pediades group; included in Pacific Northwest key of Hermanson(1), occurs in WA (Andrew Parker, pers. comm.), and in BC (Oluna Ceska, pers. comm.)
Cap: 1.5-3.5cm across, convex, expanding only slightly and becoming flat on top, margin slightly incurved at first; not hygrophanous, rich pale ochraceous or cream, yellowish cream on drying; "greasy-viscid to touch often with adhering soil, smooth, not cracked or slightly wrinkled with age", margin "non-striate, with white feathery fibrils of veil when young", (Watling), 1-3(4)cm across, hemispherical to convex, or sometimes broadly convex to flat when old; ocher to golden brown or yellow-brown, but varying to yellowish buff, creamy, or even rusty brown; dry or slightly viscid, smooth or sometimes cracked when old, margin not striate but sometimes has whitish veil remnants, (Arora), 1-6cm across, hemispherical to broadly convex; whitish to dull yellow brown; bald, slightly viscid when moist, (Hermanson)
Flesh: quite thin, even at disc; white or ivory becoming pale buff, (Watling), thin; pallid, (Arora), thick, whitish, (Hermanson)
Gills: adnate, distant; pale sepia then darker, finally snuff brown, edge distinctly whitish, (Watling), "close, at first adnate but often seceding"; pallid, soon brown to rusty brown or cinnamon brown, (Arora), "adnate, seceding, broad"; "very pale brown becoming +/- rusty brown", (Hermanson)
Stem: 2.5-4cm x 0.43-0.5cm, widening downwards; pale ochraceous, at first with distinct ochraceous fibrils, finally cream or ivory; smooth, (Watling), 2-5(7)cm x 0.15-0.3(0.6)cm, more or less equal; pallid or buff to yellow-brown (often paler at top and darker in lower part); dry, often longitudinally striate, (Arora), 2-7cm x 0.15-0.3cm, equal, tapering downward or with a slightly enlarged base; pale yellow orange in upper part with yellowish brown near base; more or less fibrillose, furfuraceous [with branny particles], becoming bald, (Hermanson)
Veil: absent or if present then fleeting and fibrillose (not membranous) and either disappearing or leaving slight remnants on cap margin and/or stem, (Arora), none (Hermanson)
Odor: very mealy (Watling), mild or farinaceous (Arora)
Taste: very mealy (Watling), mild or farinaceous (Arora), farinaceous (Hermanson), farinaceous and disagreeable (Miller)
Microscopic spores: spores (10.5)11-13.5(14) x (6.5)7-7.5(8) microns, broadly elliptic in face view, slightly flattened on one side in side view, snuff brown in water and alkali, thick-walled, germ pore very large; basidia 4-spored, colorless, clavate-cylindric; pleurocystidia very rare, scattered, similar to cheilocystidia, cheilocystidia variable, ventricose-rostrate with +/- subcapitate head to lageniform, colorless, +/- with mucilaginous cap, 30-45 x 7-10 microns, head 2-4 microns; cap cuticle "a hymeniform layer of subglobose to ellipsoid cells not intermixed with hairs"; stem cuticle "of cylindric hyphae supporting groups of variously shaped cells similar to those on gill-margin"; clamp connections present, (Watling), spores 9-13 x 6.5-8 microns, elliptic, smooth, truncate with germ pore, (Arora), spores 10-12 x 6-6.5(7) microns, with distinct germ pore; basidia 2-spored and 4-spored; cheilocystidia present, (Hermanson)
Spore deposit: snuff brown (Watling), brown (Arora), dark brown (Hermanson), rusty brown (Miller), dark tobacco-brown (Miller)
Habitat / Range
scattered to gregarious in grass, cultivated ground, dung, manure, sand, (Arora), grasslands, pastures, May to June, (Phillips), scattered to gregarious, "grassy areas, waste land, poor pastures, and sand dunes", (Hermanson), "amongst grass in sandy areas in gardens and fields", (Watling for Britain), spring, summer, or fall, (Miller)
three other related species: A. semiorbicularis, A. subpediades (status in Pacific Northwest not given clearly) and A. stepposa (status in Pacific Northwest not given clearly) are 2-spored with larger spores, (Hermanson), A. semiorbicularis has more hemispherical, less pale cap that is quite viscid when wet, and has 2-(4-)spored basidia, (Watling), A. subpediades (Murrill) Watling has cap more dingy, +/- viscid, gills dark dirty brown, (Courtecuisse); Stropharia semiglobata averages larger, has different spore color, and has a ring on stem, (Watling), and has slimy cap and stem, lilac spore deposit and grows on dung or in manured places (Breitenbach)
Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2019. E-Flora BC:
Electronic Atlas of the Plants of British Columbia [eflora.bc.ca]. Lab for
Advanced Spatial Analysis, Department of Geography, University of British
Columbia, Vancouver. [Accessed:
18/11/2019 5:16:20 AM
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