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Species Information
Summary: The sporocarp [fruitbody] is up to 0.8cm in diameter, grayish brown and tuberculate, without a peridium and containing spores 35-105 microns in diameter when they are round, the spores "free in soil, in dead rootlets, in loose aggregations, in small compact clusters, and in sporocarps". Trappe(8) corrected the Latin ending to neuter, because Glomus is a neuter noun despite its ending. The description is derived from Gerdemann(1). It is abundant in the Pacific Northwest and common worldwide, (Trappe(13)).
Gerdemann(1) examined collections from BC, WA, OR, ID, and CA. It was noted to be a common mycorrhizal fungus, also widely distributed elsewhere in North America and Europe, and known from Trinidad and Australia.
Outer Surface: sporocarp [fruitbody] up to 0.8cm by 0.5cm by 0.5cm, irregularly spherical or flattened; grayish brown; tuberculate
Microscopic: chlamydospores 35-105 microns in diameter when round, 75-150 x 35-100 microns when nearly round to oboval, elliptic, nearly lens-shaped, cylindrical or irregular; smooth or appearing rough from debris; spores borne "free in soil, in dead rootlets, in loose aggregations, in small compact clusters, and in sporocarps"; spore walls 3-17 microns thick, colorless to light yellow or yellow brown, "the thicker walls often minutely perforate with thickened inward projections"; peridium absent
Habitat / Range
underground: in dunes, cultivated fields, meadows, orchards, and forests, greenhouses (where sometimes on top of soil), collected most commonly in November through February in the field, (Gerdemann), forms arbuscular mycorrhizae with many plants (Trappe(13))
