Monographs Details: Scytonema longiarticulatum 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 associated with other algae, not forming a definite stratum alone, 400-500 µ long, 15-18 µ diam., arcuate or almost straight; trichomes not constricted at the dissepiments, 9-11 µ diam. at the apices, 5-8 µ diam. in the body of the filament; cells olive-green, finely granular, 18-25 µ (up to 35 µ) long in the body of the filament; heterocysts cylindrical, of the same size as the cells, sparse; sheath at first completely hyaline, finally becoming brown in contact with the trichome, the thick surface layer remaining hyaline for considerable length of time but finally the whole sheath becoming dark brown, homogeneous or faintly lamellose at maturity, the lamellae not diverging.
Distribution and Ecology - Growing in association with other species of Myxophyceae on pulverized rock at "Campo," Maricao, no. 1229 a, type; on rock at Jayuya, no. 1768
PLATE 15, FIGURE 28
The species of Scytonema diagnosed above has the longest cells of all of the known species and is closely related to S. pulchellum.