Fig. 184 Nematophytales. Nematothallus. A, specimens on rock 



( X I). B, large and small tubes, the former with fine annular 



thickenings ( x 150). C, cuticle ( x 150). (After Lang.) 



Fig. 185 Nematophytales. Nematophyton. A, longitudinal section 

 ( X 120). B, transverse section ( x 120). (After Seward.) 



304 



