Monographs Details: Anacystis minutissima 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:Microcystaceae
Description:Species Description - Colonies spherical to somewhat irregular in outline, 15-25 µ (up to 45 µ) diam.; cells densely crowded together, 0.8-1.2 µ diam., pale aeruginous, often tinged with yellow; tegument thin, homogeneous, close-fitting, hyaline.

Distribution and Ecology - Growing in association with other Myxophyceae among moss on a water pipe near a stream, Maricao, no. 1194 a, type; on tree trunks, Coamo Springs, no. 300 d; on a wall at a bridge in Caguas, no. 462; on broken rock about seven kilometers east of Coamo, no. 1869 e; on a wall at Hot. Springs, no. 402 b; in the overflow from a hot opening, Coamo Springs, no. 402 b; on a brick wall near Juan Martin, Fajardo, no. 732 a; in the overflow from a hot spring, Coamo Springs, no. 367 e.

Discussion:

PLATE 5, FIGURE 46

The specimens of this species of Anacystis are almost perfect spheres when young, and for the most part retain the shape to maturity. Apparently the resting spores merely develop a very thin, smooth wall at maturity. The species seems closely related to A. firma (Breb. & Lenorm.) Schmidle, but does not form the firm, mucous stratum characteristic of that species. There is also much less variation in the size of the cells.