Monographs Details: Oscillatoria chalybea var. insularis 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 straight except at the slightly unicinate apices, and relatively rigid, 6.4-7.2 µ diam., not constricted; cells quadrate or less than the diameter long, otherwise as the species.
Distribution and Ecology - Collected by Dr. W. C. Earle in the vicinity of Manati, Porto Rico, growing on aquatic plants and free-floating.
PLATE 7, FIGURE 68