Monographs Details: Calothrix braunii var. mollis 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:Rivulariaceae
Description:Species Description - Filaments growing in small tufts 80-110 µ long, decidedly bulbous at the base, 8-10.8 µ diam. at the base; trichome tapering gradually from the base, terminating in a slender hair as long as or longer than the main body, bright aeruginous, 5-6 µ diam. at the base; hair 1.4 µ diam.; sheath hyaline, ocreate.

Distribution and Ecology - Growing on earth among other Myxophyceae, Maricao, no. 1037 b, type.