196 Alexander W. Ez'ans, 



portions being reduced to vague and imperfect unistratose wings, 

 scarcely more than a single cell wide. So far as the material indi- 

 cates, the openings into the antheridial chambers are separated by- 

 two rows of cells. In one instance a male inflorescence had given 

 rise to a secondary inflorescence, after producing about ten anthe- 

 ridia, and both the primary and secondary inflorescences had con- 

 tinued to develop additional antheridia to the number of ten or 

 twelve. Each had then proliferated, one growing out into a flat 

 branch and the other into a stolon-like branch. On the whole the 

 male branches appear less differentiated than in the majority of the 

 species. 



No female branches have been seen in the writer's material. 

 According to Stephani such branches are very short, conduplicately 

 concave, incised-bilobed at the apex, and entire. He adds that the 

 "calyptra" attains a length of 3 mm. and that its surface is smooth, 

 except for a few long cilia at the base. 



It would be impossible to confuse R. crassicrispa with any of the 

 other Chilean members of the genus. It shows an approach, 

 however, to Aneura cochleata (Hook. f. & Tayl.) Mitt, of Xew 

 Zealand and Tasmania, a species which Stephani has recently 

 reported also from the Falkland Islands and South Georgia (32, 

 p. 6). A. cochleata is still incompletely known but is more robust 

 than R. crassicrispa, the thallus having a width of 5 mm. and a 

 thickness of sixteen cells. It differs further in its more definitely 

 lobate thallus, the lobes being described as ovoid, cochleate, thick 

 and fleshy, and two-lobed at the apex, thus representing apparently 

 the latent rudiments of branches. 



