PLATE 25. 



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



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



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



Fauchea laciniata J. Agardh. 



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



and shape of the sori. (nat. size) 



44. Outline of a portion of a eystoearpie plant, showing the extreme of 



laciniate margin, (nat. size) 



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

 W. A. Setchell. 



[414] 



