Monographs Details: Calothrix parietina var. torulosa 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 - Filaments 400-700 µ long, rigid, straight or in part with moderate curves; trichomes olive-green, decidedly torulose in the lower part; sheath narrow, firm and homogeneous, becoming slightly lamellose and in part thickened later; a few of them slightly ocreate, and yellowish-brown.

Distribution and Ecology - In Rio Grande, near Sabana Grande, no. 914, type.