206 Jfirst Annual Heport 



Pelvetia fastigiata (J. Ag.) deToni 



In immense colonies on the rocks of the high tidal zone, forming 

 a distinct zone which reaches almost to the upper limits of algal 

 growth. 



Cystoseira osmundacea (Mentz.) Ag. 



A frequent component of the beach wrack. Dr. Setchell gives this 

 determination with doubt. 



Halidrys dioica Gardner 

 Common on the rocks of the lower tidal zone. 



Sargassum agardhianum Farlow 

 Common on rocks near low tide mark. 



DICTYOTACEAE 



Zonaria tournefortii 



Dictyopteris zonarioides Farlow 



Dictyota binghamiae J. Ag. 



Dilophus flabellatus Collins 



The above four species are all frequent on rocks of the middle 

 tidal zone. 



RHODOPHYCE^E 



BANGIACEAE 



Porphyra naiadum C. L. Anderson 

 Commonly epiphytic on basal portions of Phyllospadir. 



HELMINTHOCLADIACEAE 

 Chantrasia dictyotae Collins 



(Figure 113) 



Abundant as an epiphyte on Di< ti/n/n lih/f/Juiiniae. Sporangia .02 

 mm. in diameter. 



Nemalion lubricum Duby. 



(Figure 114) 



Common on rocks of the lower tidal zone, especially on the faces 

 of rocks exposed to the direct pounding of the heaviest surf. Stem 

 commonly 1.4 mm. in diameter. 



Helminthocladia purpurea (ITarv.) J. Ag. 

 Only seen twice, both times in the lower tidal zone. 



