Monographs Details: Microcoleus purpureus 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 - Filaments 15-25 µ (up to 50 µ) thick, acuminate, scattered promiscuously among other algae, more or less contorted, closed at the apices when young, dissolving, and the trichomes protruding at the apices when older, with the trichomes crowded close to each other in the center and more or less intertwined but finally separating into separate strands and forming new filaments; trichomes up to 60 or more within a sheath, mostly parallel, 1.7-1.9 µ diam., pale purplish-drab, not constricted, with acute and in part uncinate apices; cells homogeneous, 3-4 times as long as the diam.; sheath hyaline, homogeneous, somewhat gelatinous and irregular along the margin.

Distribution and Ecology - Growing on a wall in Fort San Cristobal, San Juan, no. 1991 d, type; on a wall in a cemetery, San Juan, no. 130 a.

Discussion:PLATE 11, FIGURE 4