1920] Setchell-Gardncr: Chlorophyceae 227 



Spongomorpha saxatilis var. Chamissonis (Kupr.) Collins 



Filament.s 40-6()/x diam., cells 3-4 diam. long, nodes constricted; 

 cells slightly shorter towards the base. 



Alaska to Washington. 



Collins, Green Alg. N. A., 1909, p. 360. ClMophora Chamissoms 

 (Rupr.) De-Toni, Syll. Alg., vol. 1, sect. I, 1889, p. 333; Collins, 

 Holden and Setchell, Phyc. Bor.-Anier. (Exsicc), no. 920. Conferva 

 Chamissonis Ruprecht, Tange, 1851, p. 403. 



Sponcjomorpha saxatilis resembles looser conditions of S. arcta, 

 but is even more lax, as a rule, than any condition of that species. It 

 resembles >S'. spinescens in having very much attenuated branches and 

 even moderately sharp branchlets, but it never has hooked, acute, 

 tipped branchlets. It is also more lax and less split up into symplocoid 

 tufts than is usual with the S. spinescens of our coast. 



The tj'pe of Conferva saxatilis Ruprecht was found at ''Cap 

 Nichta" in the Sea of Ochotsk, and the other specimens referred to 

 it seem to differ from it and among themselves in coarseness and pro- 

 portions of segments. Yendo, who has examined the type specimens 

 of Ruprecht 's species of Conferva, refers (1916, p. 245) Conferva 

 Chamissonis and C. saxatilis to the same species, as Collins had already 

 done. Collins, however, was inclined to add Conferva Mertensii and 

 C. viminea as well, but Yendo says that while the type specimens in 

 St. Petersburg show that the two latter are identical they also show 

 that they are quite distinct from the two former. We, also, have felt 

 it necessary' to keep C. Mertensii separate from C. saxatilis. 



5. Spongomorpha Mertensii (Rupr.j S. and G. 



Plants up to 11 cm. high, erect, moderately rigid, lax, bright green; 

 branching alternate, branches erect, angles acute ; main filaments and 

 branches 110-160/x diam. above, 80-110/x diam. below; segments 0.5- 

 2.5 times as long as the diameter, terminal rounded or gradually taper- 

 ing, even prolonged into long spinous rhizoids, up to 5 times as long 

 as the diameter; spiny branchlets absent; short, ])luiit, l)ranched, 

 hooked branchlets generally present. 



Alaska (Unala.ska and Sitka) to California (San Francisco). 



Setchell and Gardner, Phyc. Cont. I, 1920, p. 280. Conferva 

 Mertensii Ruprecht, Tange, 1851, p. 403. Canferva viminea Ruprecht, 



