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ends, without midribs, and with irreg- 

 ular sori basally disposed. 



Eisenia. The short, stout stipe is 

 forked, and each division bears termi- 

 nally a tuft of wrinkled, serrate leaves 

 a foot or more in length. The general 

 habit of the plant is much like that 

 of Postelsia, from which it can be 

 distinguished by the strong forking of 

 the stem and the much greater size 

 and length of the leaflets. 



Cymathere. From a small, disc- 

 shaped holdfast, springs a long, slender, 

 ribbon-like lamina with short stipe and 

 a triplicate longitudinal fold along the 

 middle. 



Costaria. The leaves are broad, 

 very much wrinkled and often perfo- 

 rate. There are commonly five strong 

 longitudinal ribs, three of which are 

 prominent on the upper surface and 

 two on the lower. 



