538 



BULLETIN OP THE BUREAU OE FISHERIES. 



Chart 268. — Distribution of algae on Spindle Rocks, April 22, 1905. 



Rocks still very bare above low-water mark, where they were scraped clean during the winter by 

 floating ice. Cladophora lanosa var. uncialis (11) formed a green fringe on certain rocks near low-water 

 mark (the dotted line), with the brown algae Phyllilis fascia (24) and Scytosiphon lomentarius (26) begin- 

 ning to appear lower down; this rather imperfect brown zone was composed of young growth and was 

 not very conspicuous at this date. Well below low water were growths of the conspicuous red algae 

 Polysiphonia urceolata (47) and Chondrus crispus (49). 



List of species: Cladophora lanosa var. uncialis, 11, very abundant; Ectocarpus cccidioides, 13, on 

 old Laminaria; Ectocarpus fasciculatus , 15, abundant on larger algae; Ectocarpus ovatus, 17, on mussel 

 shells; Ectocarpus penicillatus, 18, very abundant on larger algae; Sorocarpus uvceformis, 21, on mussel 

 shells; Desmotrichum balticum, 22, mixed with Scytosiphon; Desmotrichum undulatum, 23, mixed with 

 Scytosiphon; Phyllitis fascia, 24, young growth on rocks; Scytosiphon lomentarius, 26, young growth on 

 rocks; Desmarestia viridis, 27, many young plants; Chordaria flagelliformis, 28, young plants; Chorda 

 tomentosa, 32; Laminaria Agardhii, 33; Acrochcetium virgatulum, 39, on Ceramium; Ceramium rubrum, 

 43; Polysiphonia urceolata, 47, abundant; Chondrus crispus, 49, abundant. 



