Monographs Details: Stigonema elegans 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:Stigonemataceae
Description:Species Description - Filaments 400-500 µ long, 16-20 µ diam., with longer or shorter curves, forming a more or less flocculent stratum; branches not abundant, of two sorts, one short and pointed, hormogoniferous, and the other like the main axis, arising at right angles, not attenuated; cells in part uniseriate and in part pluriseriate, compressed-spherical, with distinct walls between and protoplasmic connections, about one-half as long as broad, homogeneous, bright blue-green; heterocysts formed by longitudinal division of vegetative cells one-half of each becoming a heterocyst; sheath smooth, firm, 2-2.5 µ thick, homogeneous, dark brown; hormogonia secund, 45-60 µ long.

Discussion:

PLATE 20, FIGURE 51

Growing on '' Flytteblok," near Humacao, no. 573, type, and no. 575 b; on rocks at Laguna Tortuguero, no. 852 d; on soil along the road, Maricao, no. 1247; on bark by the road, north of Maricao, no. 1261; on old plants on lava in a primeval forest, near Hacienda Catalina, Palmer, nos. 768 a and 769.