PLATE XI. 



riG. PAGE 



1 . Nitophyllum laeeratum ] 43 



1 a, marginal processes with tetraspores, magnified. 



2. Chylocladia articulata 187 



2 a, part of a branch with spores, magnified. 



3. Gloiosiphoiiia capillaris 196 



3 a, branchlet with fructification, magnified. 



4. Callithamnion plumula 234 



4 a, spore-clusters, magnified. 



