KEY TO THE GENERA. 69 



(<r.) Branches clothed: 



1. With rows or circles of closely set, very 

 short spines, which overlap each other, 

 thus covering every part of the frond. 



CladostepJms. 



2. With ^ort, fine, light olive green, delicate 

 fibrils, which fall away and leave bare 

 spines ; or with long darker green pencils 

 of hair-like filaments. Desmarestia. 



V. Frond capillary. 



I . Uitbranched. 



Frond small, parasitical on Fuais, tufted. 



Elachista. /Ik. 



2. Bra?iched. 



Frond fine, profusely branched ; from a yel- 

 lowish to a bright green; parasitical on 

 Fuais, Cho?da, Chordaria and other ,, 



Algse. Ectocarpus. V 



VI. Frond tuberform. 



Fronds look not unlike green tomatoes. , 



Leatliesia. 



(^>-«^- <tD 



