219 First 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 commonly 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 alge of the lower tidal zone. 
Pterosiphonia woodi (Harv.) Falk. 
(Figures 118 and 119) 
Commonly epiphytic on Nereocystis. Length of cells commonly 
2mm. Diameter of cystocarps, .4 mm.; tetraspores .12 in diameter. 
