Monographs Details: Anacystis willei 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, smooth, very variable in size, to 200 µ diam.; cells spherical to somewhat compressed, not densely crowded, 5-6 µ diam., remaining in separate teguments for some time in groups of 2 or 4, bright aeruginous, homogeneous; tegument tough, more or less lamellose throughout the colony, 4-5 µ thick outside of the group of cells, hyaline, changing with age to rose-pink or coral-red; resting spores 7-8 µ diam., coral-red, smooth.

Distribution and Ecology - Growing interspersed among other Myxophyceae near Laguna Joyuda, Mayagüez, no. 1209 a, type; on soil by the road to Monte Montoro, Maricao, no. 1094 a; on rocks in a ravine by Coamo Springs, no. 1901 d; on rocks near Laguna Joyuda, Mayagüez, no. 1307 a; on rocks, Jayuya, no. 1770 a.

Discussion:

This species of Anacystis belongs to a group in which the cells secrete separate teguments which do not immediately fuse with the general colonial tegument. When the color begins to develop these separate sheaths become very visible.