Monographs Details: Oscillatoria tenuis C.Agardh ex Gomont
Authority: Gardner, Nathaniel L. 1927. New Myxophyceae from Porto Rico. Mem. New York Bot. Gard. 7: 1-144. pl. 1-23.
Family:Oscillatoriaceae
Description:Species Description - Plants not forming a definite stratum, but distributed among other algae; trichomes 6.8-7.8 M diam., not constricted, end walls decidedly thickened; contents homogeneous or with a few scattered fine granules in rapidly dividing cells.

Distribution and Ecology - Floating among numerous other algae, both Chlorophyceae and Myxophyceae, in the Turabo River near Caguas, no. 486 a, type; in a ditch along the way to the Playa, Fajardo, no. 696 b.

Discussion:

PLATE 7, FIGURE 66

Most of the plants referred to O. tenuis Agardh do not have the end walls thickened. Gomont does not figure them in his monograph of the Oscillariees as having capitate or thickened ends, although according to his description the end wall should be slightly thickened.

The plants described here vary from the species in having decidedly thickened end walls, in not being constricted at the cross walls, and in not having granules collected at the cross walls.