Monographs Details: Tolypothrix 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:Microchaetaceae
Description:Species Description - Filaments growing in microscopic tufts among other algae, up to 1 mm. long, 7-8.5 µ diam., sparsely branched; trichomes 2.4-2.6 µ diam. in the older parts, 4.2-4.6 µ diam. at the apices; cells quadrate to 3.5 times (up to 6 times) as long as the diameter, cylindrical when mature, slightly dolioform in the meristematic region at the apex of the trichome, mostly homogeneous; apical cell frequently subspherical; heterocysts sparse, of the same shape and size as the cells: sheath relatively thick, hyaline, homogeneous.

Distribution and Ecology - Growing in a reservoir west of the Experiment Station, Kio Piedras, no. 209 a, type; in a pool in Jayuya, no. 1649 a.

Discussion:

PLATE 20, FIGURE 50

Tolypothrix Willei apparently is a close relative of T. fasciculata Gomont. It does not form the fascicles characteristic of that species, is shorter and narrower, and has much longer cells in the older parts of the trichomes.