Monographs Details: Scytonema guyanense var. minus N.L.Gardner
Authority: Gardner, Nathaniel L. 1927. New Myxophyceae from Porto Rico. Mem. New York Bot. Gard. 7: 1-144. pl. 1-23.
Description:Species Description - Filaments 12-18 µ diam., long, flexuous, forming a thin, floccose stratum; trichomes up to 13 µ diam. at the apices, 6-8 µ in older parts; cells cylindrical, or slightly torulose at the apices, quadrate or less at the apices of the trichomes, 2-4 times as long as the diameter in the older parts, homogeneous or with a few refringent granules; sheath slightly lamellose, lamellae not diverging.

Distribution and Ecology - Growing on lava between Arecibo and Utuado, no. 1455, type.

Discussion:Variety minus, as diagnosed above, differs from the species chiefly in having on the average smaller filaments, thinner and less lamellose sheaths, and longer and narrower cells in the main body of the filament.