Monographs Details: Anacystis nidulans 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 - Colonies spherical, 25-40 µ diam., free; cells usually 16-32 in a colony, but up to 64, subspherical to irregularly angular, 3.5-4.5 µ diam. in the juvenile stages, larger at maturity, pale aeruginous, homogeneous; resting spores 7.5-9 µ diam., of the same shape as the vegetative cells, with a thin, membranaceous, smooth, coral-red wall, obscuring the contents, densely crowded together within the mother utricle; sheath close-fitting, submembranaceous, and coral-red on the surface, pale pinkish in the interior.

Distribution and Ecology - Growing on bark near Laguna Joyuda, Mayagiiez, no. 1207 a, type.