Monographs Details: Tolypothrix robusta 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 more or less matted together, forming a pannose stratum, 1-2 mm. long, 22-30 µ diam., straight or arcuate, fairly rigid; trichomes 12-18 µ diam., the smaller diameter in the older parts of the filament, the larger at the apex, constricted more or less at the dissepiments; cells very short, 2-4 µ long in the meristematic region, quadrate in the older parts, bright aeruginous, densely and finely granular; heterocysts of the same size and shape as the cells; sheath hyaline, homogeneous, and subgelatinous when young, changing to lamellose and becoming successively colored brown from the trichome outward.

Distribution and Ecology - Growing in association with other algae in Laguna Tortuguero, no. 827, type, and no. 826.

Discussion:PLATE 20, FIGURE 49