Monographs Details: Microchaete tenera var. tenuior 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 scattered among other algae, 4.8-6.5 µ diam., largest at the apices; trichomes 3.5-4.5 µ diam.; cells densely and coarsely granular; resting spores 5-6 µ diam., 7-11 µ long, in the central and upper parts of the trichome in broken series of 2 to 16; sporo wall smooth, brown.

Distribution and Ecology - Growing among Hepaticae in company with other algae by the road near Adjuntas, no. 1571, type. Collected by Elizabeth G. Britton.

Discussion:The variety tenuior differs from the species in being smaller in all of its measurements and in having the resting spores occurring either singly or in broken series, variable in number, and in size. Very little has been said of the spores in M. tenera. Forti (in De Toni, Syll. Alg. 5: 483) says they are cylindrical and seriate.