216 jffrst annual Report 



Heterosiphonia subsecunda (Suhr) Falk. 



(Figure 124) 

 Epiphytic on other algae. Stichidia .8 mm. in length. 



Dasya pacifica Harv. 



(Figure 125) 

 Occasional in beach wrack. Stichidia .45 mm. in length. 



CERAMIACEAE 

 Spermothamnion snyderae Farlow 



(Figure 126) 



Occasional in small colonies on the under side of ledges in the 

 lower tidal zone. Sporangia .1 mm. in diameter. 



Griffithsia sp. 

 (Figure 127) 



A common epiphyte on the algas of the lower tidal zone. Spor- 

 angia .08 mm. in diameter. Dr. Setchell says of this plant: "The 

 specimens all have tetraspores. I wish very much that it might be 

 found with cyxtocnrps. Until then we shall be uncertain as to the 

 genus. Griffithni(i is perhaps hardly to be applied to this plant. In 

 all probability it is more likely to belong to one of the related genera, 

 but it is impossible to decide this witli certainty until we have the 

 cystocarpic fruit." 



Callithamnion rupicolum forma pygmaeum Collins 



(Figures 128 and 129) 



An occasional epiphyte on other algae of the lower tidal zone. 

 Sporangia .07 mm. in diameter. Cystocarps .2 mm. in diameter. 



Antithamnion floccosum (Muell.) Klein 

 An epiphyte on Nereocystis. 



Spyridia filamentosa ( \Yulf.) Harv. 

 Rare in the beach wrack. 



Ceramium codicola J. Ag. 



(Figure 130) 

 Common on Codium ntcro>iatni, length commonly 1 cm. 



Centroceras clavulatum (Ag.) Mont. 

 Abundant on the rocks of the upper tidal zone. 



Microcladia coulteri Harv. 

 Epiphytic on Prioititix. 



