Monographs Details: Scytonema ocellatum var. constrictum N.L.Gardner
Authority: Gardner, Nathaniel L. 1927. New Myxophyceae from Porto Rico. Mem. New York Bot. Gard. 7: 1-144. pl. 1-23.
Family:Scytonemataceae
Description:Species Description - Filaments much contorted, 15-19 µ diam.; trichomes 12-14 µ diam., heterocysts subspherical to much compressed, frequently of less diameter than the trichomes, the filament being constricted at the heterocysts under such circumstances.

Distribution and Ecology - Growing with other species of Scytonema on rocks by the road north of Maricao, no. 1253, type.