Monographs Details: Anabaena 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.
Description:Species Description - Trichomes bright aeruginous, long, relatively straight, deeply constricted at the dissepiments, 4.8-5.2 µ diam., attenuated at the apices; cells short, mostly quadrate, cylindrical, finely granular; apical cell conical; heterocysts cylindrical or somewhat doliof orm, 5-6 µ diam., 9-12 µ long, hyaline; spores cylindrical, 6.5-8.6 µ diam., 15-20 µ long, smooth, outer layer slightly brown in color, densely granular, bright blue-green, 2-3-catehate next to the heterocysts.

Distribution and Ecology - Growing in a pool among other algae, Jayuya, no. 1750, type; in a ditch, Ponce, no. 1670 a; in a small stream about five kilometers east of Coamo, no. 237.



Anabaena Willei belongs to the Sphaerozyga section of the genus, as limited by Agardh (Aufzaehlung, 634, 1827) and is related to A. oscillarioides.