Monographs Details: Phormidium purpurascens var. homogeneum N.L.Gardner
Authority: Gardner, Nathaniel L. 1927. New Myxophyceae from Porto Rico. Mem. New York Bot. Gard. 7: 1-144. pl. 1-23.
Description:Species Description - Filaments forming a thin, compact, pale-purplish stratum; trichomes 1.2-1.5 µ diam., pale purplish, not constricted; cells quadrate to one-half as long as the diameter, homogeneous; cross-walls distinct; apical cell blunt.

Distribution and Ecology - Growing on rocks in warm water flowing from Coamo Springs, no. 367, type.

Discussion:The above-described form differs from the species in lacking granules at the cross-walls, in having the trichome smaller in diameter, and the cells shorter.