Glomus trufemii (Glomeromycetes), a new sporocarpic species from Brazilian sand dunes

Abstract

Glomus trufemii, which forms large aggregates (≤ 850 × 1200 μm) in the rhizosphere of a herbaceous plant community in NE Brazilian sand dunes, is described as new. Its subglobose glomerospores measuring 72–92 × 79–105 μm have two spore wall layers: an evanescent hyaline 0.3–0.8 μm thick outer layer and a laminate orange brown to dark red brown 7.4–15.5 μm thick inner layer. The pigmentation of the subtending hypha is similar but often much lighter than that of the laminate spore wall layer. The spore size and color, spore wall structure, and features of the spore base and subtending hyphae separate this species from similar yellow-brown to brown spored species like G. badium, G. glomerulatum, and G. brohultii.