Monographs Details: Scytonema lyngbyoides 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 forming a dense velvety stratum, or more or less intertwined and pannose, 28-32 µ diam. in main filaments, branches as small as 20 µ diam.; trichomes 18-25 µ diam., more or less constricted at the dissepiments; cells one-third to onesixth as long as the diameter, bright violet to olive-green, homogeneous; cross-walls thin, but distinct; heterocysts of the same shape and size as the cells, hyaline, sparse; sheath hyaline, homogeneous; branching geminate for the most part, occasionally single.

Distribution and Ecology - Growing on rocks in a brook about five kilometers north of Utuado, no. 1607, type; on rocks between Utuado and Adjuntas, no. 1646.

Discussion:

PLATE 17, FIGURE 35

The violet or dark olive-green color of the trichomes, the homogeneous hyaline sheath, the sparsity of the hyaline heterocysts, and the lack of abundant branching, characteristic of the above newly described species, remind one at first sight of the genus Lyngbya; hence the specific name.