Monographs Details: Phormidium rubriterricola 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 - Trichomes 2.2-2.4 µ diam., short, not constricted, apices straight; cells quadrate to slightly longer or shorter, contents homogeneous, caerulescent to slightly drab-colored; apical cell blunt-conical; cross-walls very distinct; sheath hyaline, very thin, but distinct, not confluent.

Distribution and Ecology - Growing on red earth, Maricao, no 1056, type.

Discussion:PLATE 9, FIGURE 86