Monographs Details: Scytonema multiramosum 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 erect, entwined into dense fascicles more or less agglutinated by the soft, slightly gelatinous sheaths, 1.5-2.5 µ long, 9.5-13 µ diam., profusely branched in pairs in the upper parts of the filament between the heterocysts; trichomes 7-8 µ diam. at the apices, gradually diminishing to 3 µ diam. in older parts; apical cells slightly doliof orm, subquadrate, densely granular, other cells 1.5-4 times as long as the diameter; heterocysts quadrate to twice as long as the diameter; sheath thin at the apices, gradually thickening as the trichomes diminish in size, hyaline, and homogeneous when young, becoming yellowish and laminated when old, the lamellae divergent, and slightly ocreate at the apices.
Distribution and Ecology - Growing on moist rocks about ten kilometers north of Utuado, no. 1527, type.
PLATE 18, FIGURE 39
The young stages of this species of Scytonema very closely resemble S. subgelatinositm of this paper. The sheath when young is hyaline and homogeneous, and the filaments relatively short, permanent characters of S. subgelatinosum. At maturity the branching is very profuse near the outer ends of the filaments, the sheath becomes brownish, laminated, and in part ocreate, characters which do not appear in 8. subgelatinosum.