GLOMUS SPURCUM - A NEW ENDOMYCORRHIZAL FUNGUS FROM ARIZONA

A new species of endomycorrhizal fungus (Glomus spurcum) is described and illustrated. The fungus is known to form arbuscular mycorrhizae wi th at least eight species of plants. Intraradical vesicle formation by G. spurcum has not been observed. Intraradical hyphae can be enlarged and lobed in a manner similar to that described for a species of Acau lospora. The mycorrhizae formed by G. spurcum are similar to that of s ome species of Acaulospora but the gross morphology of the spores and spore development place it in Glomus as that genus is currently define d.