Monographs Details: Oscillatoria refringens
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 bright aeruginous, rigid or more or less flexuous, not constricted at the dissepiments, two or three end cells slightly tapering, not uncinate, terminal wall thickened; terminal cell somewhat enlarged, 9-10 µ diam.; cells short, 1.8-2 µ long, with occasional biconcave, refringent cells, slightly larger than the trichome, interspersed, homogeneous.
Distribution and Ecology - Growing among water plants in the Turabo River, Caguas, no. 486 b, type, and no. 478; upon water plants, Jayuya, no 17.56.
PLATE 8, FIGURE 74
The biconcave, refringent cells are sufficiently abundant in a mass of trichomes to characterize the species, but there are some trichomes, especially young trichomes, which have none. The mature filaments develop a characteristic end resembling very much Oscillatoria proboscidea but the end is straight and the trichome is less in diameter than in that species. It is also close to O. anguina Bory, but lacks the attenuated terebriform apices characteristic of that species.