78 TUPTS COLLEGE STUDIES, VOL. IV, No. 7 



5. Boreal plant, dark and stiff. 2. C. mtlagonium. 



5. More southern plant ; not dark nor stiff. 9. C. crassa. 



6. Filaments 40 ^ diam. or more. 7. 



6. Filaments not over 40 M diam. 10. 



7. Filaments not over 70 M diam. 10. C. gracilis. 



7. Filaments 80 M diam. or more. 8. 



8. Cells 3-8 diam. long. 6. C cannabina. 



8. Cells not over 2 diam. long. 9. 



9. Filaments 200-250 M diam., rarely to 125 or 400 M; yellowish green. 



4. C. f. in inn. 

 9. Filaments 125-175 M diam., dark green ; southern plant. 



5. C. brachygona. 



10. Freshwater; filaments attached by pluricellular rhizoids. 



.8. C. chtlonum. 



10. Marine; attached by a disk. u. 



ii. Saxicolons; 20-40 M diam. 7. C. calif ornica. 



n. Epiphytic; 10-20 /i diatn. 11. C. minima. 



Page 323, for C. CLAVATA, substitute, 



i. C. CLAVATA (Ag.) Kiitzing, 1847, p. 166; Vickers, 1908, 

 p. 17, PI. VII ; not P. B.-A., No. 371 ; Conferva clavata Agardh, 

 1824, p. 99. Filaments attached, erect, stiff, up to 60 cm. long, 

 base about 500 /* diam., gradually increasing to 1.5 mm. at the 

 tip; lower articulations 3-4 diam. long, those of the upper part 

 about as long as broad, more or less moniliform, color deep 

 green. Fla., W. I. 



lA. C. TORTA (Farlow) Yendo, 1914, p. 264, excl. syn. ; 

 C. clavata var. torla Farlow in Collins, 1909, p. 323 ; Alg. Am.- 

 Bor. Exsicc., No. 211 ; P. B.-A., No. 571 ; C. clavata P. B.-A., 

 No. 371. Found only unattached ; filaments of nearly uniform 

 diameter throughout, little or not at all moniliform, 400-600 JA 

 diam., cells 1-2 diam. long, filaments usually coiled in a spiral, 

 often very close. Cal. Japan. 



Yendo is probably right in separating this from C. clavata, 

 but hardly in including under it C. spiralis Okamura, dis- 

 tributed in Okamura, Alg. Jap. Exsicc., No. 94, ^903, with 

 description, and figured in Icones Jap. Algae, Vol. II, PI. XCV, 

 which seems quite distinct. Certainly nothing like it has been 

 recorded in California. Yendo has C. torla (Farlow) McClatchie, 

 and the binominal occurs in McClatchie, 1897, p. 351, but with- 

 out citation or description. Though distributed as C. clavata var. 

 /or/a in 1889, no description was published till 1909, and in case 

 it should prove that Okamura's plant is the same, his name has 



