Protologue Description:
ECTOCARPUS CONFERVOIDES (Roth) Le Jolis, forma brumalis Holden. On muddy turf of Spartina roots, near high water mark, Charles Island, near Milford, Connecticut, December 25, 1898. No. 576. A winter form; fronds mostly 1-2 cm. long; main filaments about .025 mm. diam.; branches .012-.020 mm. diam. Plurilocular sporangia varying much in shape, from cylindrical to shortly conical ; length sometimes over .15 mm. ; width .015-.025 mm. ; often curved and distorted; either sessile or terminal on a branch of one to many cells. Unilocular sporangia unknown.