Monographs Details: Phormidium mucosum 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:Phormidiaceae
Description:Species Description - Filaments 7.2-7.8 µ diam., long, straight, or arcuate and smooth; trichome 2.5-3 µ diam., not constricted at the dissepiments, neither uncinate nor capitate; cells 2-2.5 times as long as the diameter, contents homogeneous, walls inconspicuous; apical cells rounded; end wall not thickened perceptibly more than the others; color pale aeruginous; sheath relatively thick, more or less gelatinous, hyaline, homogeneous.

Distribution and Ecology - Growing in a water basin in a garden in Humacao, no. 641, type.

Discussion:

PLATE 9, FIGURE 84

The relatively thick and mucous or gelatinous sheath of Phormidium mucosum as proposed above, reminds one of certain narrow species of Tolypothrix and more particularly of certain species of Hypheothrix. It does not branch, and lacks the closed and acute apices characteristic of many species of the latter genus. It is apparently not abundant.