Monographs Details: Hassalia granulata
Authority: Gardner, Nathaniel L. 1927. New Myxophyceae from Porto Rico. Mem. New York Bot. Gard. 7: 1-144. pl. 1-23.
Family:Microcystaceae
Scientific Name:Hassalia granulata
Description:Species Description - Filaments 100-200 µ long, 11-13.5 µ diam., straight or somewhat arcuate, forming a very thin, more or less flocculent stratum; trichomes 10-12 µ diam., pale aeruginous, very slightly constricted at the dissepiments, of uniform diameter throughout the entire length; cells one-third to one-fourth the diameter"long, densely congested with granules, often collected along the very inconspicuous cross-walls; heterocysts subglobose to much compressed, golden yellow, mostly terminal, brought about by rupture of the sheath at that point in the filament; sheath very thin, smooth, homogeneous, golden yellow; branching sparse.

Distribution and Ecology - Growing on bark along the road near Coamo Springs, no. 1913, type.

Discussion:

PLATE 18, FIGURE 41

The medium size of the filaments, the thin, close-fitting colored sheath, and the pale-colored cells densely congested with granules distinguish this species of Hassalia from others. In size it is between Scytonema Hofmanni and S. javanicum, but the branching is all single under the heterocysts, a typical Hassalia.