Monographs Details: Aphanothece bacilloidea 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 - Cells aggregated into microscopic masses, indefinite in shape and size, not forming a definite stratum, short, cylindrical, 0.8-1 µ diam., about 2 times as long as the diameter.

Distribution and Ecology - Growing in depressions in limestone at Hato Arriba, Arecibo, no. 1407 a, type; in depressions in limestone between Hatillo and Arecibo, no. 1378; among other Myxophyceae in an underground passage in Fort San Cristobal, San Juan, no. 1989 c.