212 



jTirst Annual Report 



BONNEMAISONIACEAE 

 Ricardia montagnei Durbes and Solier 

 Commonly epiphytic on Laurencia virgata. 



RHODOMELACEAE 

 Laurencia virgata J. Ag. 



(Figure 116) 



This is a very variable species in both form and habits, growing 

 either on rocks or on the basal portions of Phyllospadix. In the lat- 

 ter case the stems usually exhibit a remarkable tendril action. Diam- 

 eter of the stems is commonlv 1.5 mm. 



Figure 125. Dasya pacifica Harv. 



Laurencia pinnatifida (Gmel.) Lamx. 

 On rocks of the lower tidal zone. 



Polysiphonia verticillata Harv. 



(Figure 117) 

 Epiphytic on other alga? of the lower tidal zone. 



Pterosiphonia woodi (Harv.) Falk. 



(Figures 118 and 119) 



Commonly epiphytic on Nereocystis. Length of cells commonly 

 2 mm. Diameter of cystocarps, .4 mm. ; tetraspores .12 in diameter. 



