Monographs Details: Anacystis nigroviolacea 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 to irregular, 2<"HL0 p (rarely up to 80 p) diam., free; cells 8-16 (rarely up to 64) in a colony, spherical to somewhat irregular, 4-5 p diam. pale aeruginous, considerably obscured by the colored tegument, not closely crowded; resting spores of the same shape as the vegetative cells, 7-7.8 p diam., with firm, smooth, dark-violet wall; tegument subgelatinous, firm and dark violet on the outside, softer and less colored toward the center of the colony.
Distribution and Ecology - Growing among other algae on rocks about ten kilometers north of Utuado, no. 1553, type; on limestone at Hato Arriba, Arecibo, no. 1399 d; between Arecibo and Utuado, no. 1476 a; on rock in Jayuya, no. 1770 c.
Anacystis nigroviolacea is apparently closely related to Gloeocapsa violacea. No statements are made in any of the descriptions, as far as I can ascertain, regarding the life history of that species, and in the absence of authentic material it is not possible at present to state the relationship. A. nigroviolacea has a definite life cycle producing the resting spores with modified walls characteristic of the genus as understood and outlined here. For a discussion of the relation of A. nigroviolacea to A. nigropurpurea of this paper see under that species.