Name: Elaphomyces subviscidus (Zeller) Trappe & Guzmán
Version: 2
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First person to use this name on MO: Nathan Wilson
Editors: walt sturgeon

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Nomenclature:

Rank: Species

Status: Accepted

Name: Elaphomyces subviscidus

ICN Identifier: missing

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Author: (Zeller) Trappe & Guzmán

Citation: Madroño 21(3): 128 (1972) 1971

Classification:
Lifeform:
Brief Description: [See More | Edit]

FRUIT BODY up to 5 cm x 3 cm, nearly round, squat, firm. PERIDI- UM white to grayish, drying yellowish. Often encrusted with soil held by incon- spicuous, but abundant, pale yellowish hyphae; smooth if the soil is rubbed off. Peridium 0.2–0.3 cm thick, with a thin, pale yellow outer layer, and a thick, white to light gray inner layer. GLEBA a powdery spore mass with sparse hyphal threads; dark brown to nearly black. STIPE absent. RHIZOMORPHS absent. ODOR like onions. TASTE not sampled. MICROSCOPY: Spores globose, 12–21 μm broad excluding ornamentation, 14–24 μm broad including ornamentation, covered with crowded spines, 1–2 μm long; separated by 0.2–0.5 μm, sometimes two or three spines are joined to form short ridges, but not forming a partial reticulum. Ornamentation is often embedded in an inconspicuous, gelatinous matrix. Smaller spores with moderately thick walls, and dark brown in color; larger spores pale brown, and thin-walled; all containing a large round oil droplet. Asci unknown, (“not observed” in type description), spores are often in spherical clusters of eight. Gleba hyphae dispersed among spores, mostly 1.5–3 (6) μm wide, thin-walled, colorless to pale yellowish brown, with scattered, dark brown, amorphous deposits between hyphae. Peridium epicutis ~150 μm thick, of densely interwoven, single to bundled hyphae 3–5 μm wide; walls mostly thin and colorless, thickened to 0.5 μm in areas, and often yellowish. The entire layer obscured by colorless to yellowish amorphous debris. Emerging, soil-binding hyphae thin-walled, colorless, 2.5–4 μm wide. Peridium subcutis ~2,500 μm thick, circumferentially aligned and interwoven fascicles of a few to many, colorless, highly refractive hyphae, 4–8 μm wide, with gelatinous-thickened walls, nearly filling the cells, and with yellowish amorphous debris scattered throughout.
ECOLOGY: Hypogeous, solitary or scattered in duff or soil under Lodgepole Pine (Pinus contorta), Western Hemlock (Tsuga heterophylla), and Mountain Hemlock (Tsuga mertensiana). Ectomycorrhizal. The type collection was exposed (“above ground on decayed granite soil”). Fruiting in late spring and summer. Most Elaphomyces species fruit bodies are long-lasting. If this is the case with this species, it could potentially be found from early spring into late fall.
SIMILAR SPECIES: Members of the Elaphomyces granulatus group have a granu- lated to warty peridium, and larger spores. The Elaphomyces muricatus group has a warty to pimply exterior peridium and is distinctly marbled in cross-section.

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