Glomus arenarium, a new species in Glomales (Zygomycetes)

Abstract

A new ectocarpic arbuscular mycorrhizal fungal species, <em>Glomus arenarium</em> (<em>Glomales</em>, <em>Zygomycetes</em>), was recovered from maritime sand dunes of northern Poland. <em>Glomus arenarium</em> forms spores with a narrow and hyaline subtending hypha. Spores are orange to raw umber, globose to subglobose, (55-)97(-120) µm diam or ovoid, 65-105 x 95-140 µm. Their wall consists of three layers: a hyaline outermost layer present only in very young spores, a semiflexible, hyaline middle layer rarely present in mature spores, and a permanent, laminate, orange to raw umber innermost layer. No spore wall layers of <em>G. arenarium</em> reagent. This fungus formed spores and arbuscular mycorrhizae in single-species pot cultures with Plantago lanceolata.