Top photos: Germinating spores of Glomus clarum
Left photo: Scutellospora heterogama.

The spores in these photos were incubating on membrane filters for 16 days before being stained. Note the various types of hyphal morphology (coarse vs. fine; pigmented versus hyaline). Glomus clarum, like some other Glomus species, produces intercalary and terminal swellings that do not appear to develop into spores. Scutellospora heterogama spores often produce abundant auxiliary cells from hyphae branching from the germ tube.