ABSTRACT: Glomus spinosum forms yellow brown to dark red brown spores in sporocarps or single in the soil. The chlamydospores are 40-90µm in diam, and have a 4-10µm thick wall which consists of a thin pale yellow-brown outer wall covered with a hyaline to light yellow dense mass of flexible hairy spines, up to 15µm long and each up to 3µm in diameter, a thick dark brown laminated middle wall with warts on the surface, up to 1µm high, and a thin yellowish brown inner wall in one wall group. Glomus spinosum forms typical vesicular-arbuscular mycorrhizae with Cunninghamia lanceolata and other plant species.

KEYWORDS: Cunninghamia lanceolata, sporocarp, vesicular-arbuscular mycorrhizae

NOMENCLATURAL NOVELTIES:
Glomus spinosum H.T. Hu, p. 160