54= 



BULLETIN OF THE BUREAU OF FISHERIES. 



Id Rock 



Chart 272. — Distribution of algae on Spindle Rocks, September 2, 1905. 



The rocks on September 2 presented an aspect similar to that on July 22 (chart 271) with some 

 features, however, more pronounced. The prevailing green alga was Ulva Lactuca var. rigida (5) form- 

 ing large patches on the tops of rocks. The most conspicuous brown algae were Chordaria flagelliformu 

 (28), growing in large masses, sometimes as a zone below low-water mark (the dotted line), and old 

 Scyiosiphon lomeniarius (26) forming patches higher up on the rocks. The most conspicuous zone (much 

 more pronounced tlian in chart 271) was that near low-water mark composed of Ceramium r«6r«?» (43) and 

 Polysiphonia violacea (48). There was much less Xemalion muttijidum (40), which, however, formed a 

 zone on rocks V, VII , and VIII . Chondrus crispus (49) was plentiful in deeper water below the Chordaria. 



List of algae: Calothrix scopulorum, i, small patches on barnacles and rocks; Rivularia atra, 2, on 

 barnacles; Ulva Lactuca var. rigida, 5, plentiful on tops of rocks; Enkromorpha crinita, 6, few plants; 

 Enicromorpha prolifera, 8, few plants; Eciocarpus cotifen'oides, 14, on old plants of Scylosiplion; Ecto- 

 carpus fasciculalus, 15, abundant on Chordaria and Chorda; Scyiosiphon lomeniarius, 26, patches of old 

 plants; Chordaria flagelliformis , 28, abundant; Chorda filum, 31, large patches; Laminaria Agardhii, 33, 

 occasional plants; Fucus vesiculosus , 35, scattered plants; Porphyra laciniaia, 37, scattered plants; Ncma- 

 lion viuliifidum , 40, abundant; Callilhamnion Baikyi, 41, many on Chordaria; Calliihamnion corym- 

 bosum, 42, many on Chordaria; Ceramium rubrum, 43, very abundant; Dasya elegans, 45, occasional 

 plants; Polysiphonia violacea, 48, very abundant; Chondrus crispus, 49, abundant; Champia parvula, 

 50, occasional on Chordaria and rocks. 



