Monographs Details: Dichothrix 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:Rivulariaceae
Description:Species Description - Filaments about 1 mm. high, forming a dense flocculent stratum, profusely branched, 12-15 µ diam.; trichome narrow, 7-9 µ at the base, very gradually attenuated, ending abruptly, about 2.5-3 µ diam. at maturity, extending into a hair when young, constricted very slightly only at the base; cells quadrate, pale greenish or bluish green, densely congested with small granules; cross-walls very thin, in part very inconspicuous; sheath thick, subgelatinous, as thick as or thicker than the trichome, hyaline when young, homogeneous, changing later to yellowish or honeycolor and very finely lamellose; heterocysts hemispherical to spherical at maturity, same diameter as the trichome; branched, 2-5 remaining within a common sheath for only a short distance, the sheath merely enlarging, not ocreate.

Distribution and Ecology - Growing in a ditch on rocks by the road about ten kilometers north of Utuado, no. 1554, type, and nos. 1555,1541,1566, 1527 b, and 1539 d.

Discussion:PLATE 14, FIGURE 24