PHYTOSOCIOLOGICAL STUDY OF THE INTERTIDAL MARINE ALGAE : II. THE ALGAL COMMUNITIES ON THE VERTICAL SUBSTRATUM FACES ON SEVERAL DIRECTIONS

Abstract

The intertidal algal communities on the vertical faces of the breakwater at the fisherman's wharf were observed at Toyoura, Hokkaido. Comparing the results with those from Usujiri^<3)>, we derive the following conclusions : 1. The algal communities on vertical substrata seemed to be strongly related to the direction the substratum faces. 2. Ptilota pectinata, provisionally reported earlier to be a species peculiar to vertical substrata, is now confirmed in respect to this tendency, and it is also designated as a shade alga. Heterochordaria abietina and Corallina pilulifera seemed to be sun forms.