Monographs Details: Plectonema murale 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:Oscillatoriaceae
Description:Species Description - Filaments much contorted and geniculate, 3.6-4 µ diam., branching sparse; trichomes 1.5-1.8 µ diam., slightly constricted at the cross-walls, not attenuated at the apices; cells pale aeruginous, quadrate to 2 times as long as the diameter; apical cell blunt.

Distribution and Ecology - Growing on the wall of a bridge, Juan Martin, Fajardo, no. 732 c, type.

Discussion:

PLATE 9, FIGURE 89

The material appears to have come nearly to the end of a period of growth as the branching is decidedly sparse, and most of the old connecting sheaths have disintegrated. The geniculate character of the filaments would indicate that branching was abundant, and more or less perpendicular to the main axis.