PLATE 25. 



Platythamnion heteromorphum f. reversum Setehell and Gardner f. nov. 



42. Portion of the tip of a plant from Whidbey Island, showing the 



arrangement of branches and branehlets. (Zeiss 2 X D) 



Fauchea laciniata J. Agardh. 



43. Portion of a tetrasporic plant, showing the habit and the arrangement 



and shape of the sori. (nat. size) 



44. Oiitline of a portion of a cystocarpie plant, showing the extreme of 



laciniate margin, (nat. size) 



All the figures were drawn by H. N. Bagley, under the direction of 

 W. A. Setehell. 



414 



