230 University of California Piihlications in Botany [Vol. 8 



mens of the former from both Iceland (Jonsson) and the Faeroes 

 (Borgesen). Our plants do not agree completely with the description 

 of either of Kjellman's species nor do they correspond to either of 

 the specimens of A. albescens which specimens, in their turn, seem 

 to us to belong to different species. 



We find that our specimens, seeming to belong to this species, have 

 been variously referred in our previous paper (1903) as will be seen 

 from the synonj^my given above. It is to be easily distinguished from 

 the next, both in habit and in the unbranched, simple, hooked branch- 

 lets. The fertile segments are all intercalary, usually one or two 

 together, and rarely three to four in a series, and generally distributed 

 over the plant. 



7. Spongomorpha coalita (Rupr.) Collins 



Plate 16, fig. 4, and plate 32 



Plants elongated, at first loosely tufted, but soon forming long, 

 dense, ropelike, branching tufts, up to 30 cm. long: at first bright, 

 later dull or yellowish green ; filaments 100-250/t diam. in the terminal 

 segment; branching dichotomous below, irregularly alternate above, 

 all branches of this class erect, with blunt, truncate, or, at times, acute 

 ends; also present, except in very young plants, abundant, patent, 

 tapering, very acute, compound, or branched, sharply and abruptly 

 hooked branches by which all the older parts are densely matted 

 together; segments 0.3-1 diam. long in the lower part of the older 

 plants, 2-3 diam. in the younger plants, and even 6-25 diam. in the 

 active terminal segment. 



Growing on rocks and on other algae in the middle and lower 

 littoral belts. Very abundant along the entire Pacific Coast from 

 southeastern Alaska (Sitka) to central California (San Luis Obispo 

 County). 



Collins, Green Alg. N. A., 1909, p. 361. Cladophora scopaeformis 

 Setchell and Gardner, Alg. N.W. Amer., 1903, p. 227 ; Collins, Holden 

 and Setchell, Phyc. Bor.-Amer. (Exsicc), nos. 819 and 922; Farlow, 

 Anderson and Eaton, Alg. Exsicc. Amer.-Bor., no. 203. Cladophora 

 coalita Setchell and Gardner, loc. cit., p. 227. Cladophora Hystrix 

 Setchell and Gardner, loc. cit., p. 226 (not of Stroemfelt). Conferva 

 coalita Ruprecht, Tange, 1851, p. 404. Cladophora arcta form a, 

 Tilden, Amer. Alg., no. 373, and form h, no. 374; Collins, Mar. Alg. 

 Vancouver Island, 1913, p. 104, as to no. 374. 



