This is one of two species in Archaeosporaceae which is distinctly dimorphic, with each spore type classified as a member of separate families (one in Acaulosporaceae and one in Glomaceae). The taxonomic problem of classifying two morphotypes of the same species in separate families required characters at the molecular level to resolve.

Acaulosporoid synanamorph (prior taxonomic history)

Nicolson & Schenck (1979)	Schenck et al. (1984)	Morton et al. (1997)
Described as a new species, Acaulospora gerdemannii	Described as a new species, Acaulospora appendicula	Synonymization of the two species as A. gerdemannii

Glomoid synanamorph (prior taxonomic history)

Schenck and Smith (1982)	Schenck and Smith (1982)	Morton et al. (1997)
Described as a new species, Glomus leptotichum	Described as a new species, Glomus fecundisporum	Synonymization of the two species as G. leptotichum

REFERENCES

Morton, J. B., J. D. Bever, and F. L. Pfleger. 1997. Taxonomy of Acaulospora gerdemannii and Glomus leptotichum, synanamorphs of one anamorphic fungus in Glomales. Mycological Research 101:625-631. 

Nicolson, T. H. and N. C. Schenck. 1979. Endogonaceous mycorrhizal endophytes in Florida. Mycologia 71:178-198.

Schenck, N. C. and G. S. Smith. 1982. Additional new and unreported species of mycorrhizal fungi (Endogonaceae) from Florida. Mycologia 74:77-92.

Schenck, N. C., J. L. Spain, E. Sieverding, and R. H. Howeler. 1984. Several new and unreported vesicular-arbuscular mycorrhizal fungi (Endogonaceae) from Colombia. Mycologia 76:685-699.