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.
Family:Nostocaceae
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.

Discussion:

PLATE 12, FIGURE 10

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