Two new species of Endochytrium, E. multiguttulatum and E. cystarum, are described. Nephrochytrium buttermerense Willoughby is transferred to Diplophlyctis under the binomial Diplophlyctis buttermerense (Willoughby) comb. nov. Morphologic and developmental information on an imcompletely known fungus, possibly a Solutoparies, and on other previously known cellulosic chytrid species are also given.