THE GREEN ALGAE OF NORTH AMERICA 329 



those of the main filaments, the terminal cell abruptly conical. 

 Me., Conn. 



5. R. KOCHIANUM Kiitzing, 1845, p. 206; Vickers, 1908, p. 

 1 8, PI. XI ; L,e Jolis, Algues marines de Cherbourg, No. 236. 

 Filaments simple, cells 12-14 /x diam., 1-2 diam. long. Form- 

 ing masses of contorted filaments on other algae. Barbados. 



Europe. 



6. R. KERNERI Stockmayer, 1890, p. 582; P. B.-A., No. 

 623; R. Kochianum Farlow, 1881, p. 49. Filaments pale 

 yellowish- green, cells 10-14 /A diam., 3-7 diam. long ; no branch- 

 ing. Me. to Conn. 



This species and the preceding are of about the same diam- 

 eter, differing chiefly in the length of the cells. R. Kcrncri 

 grows in masses, loose or mixed with other algae, in tide pools 

 or below. 



7. R. HIEROGLYPHICUM (Ag.) Kiitzing, 1845, p. 206; P. 

 B.-A., Nos. 718, 1192 ; R. lacustre Kiitzing, 1849, p. 385 ; 1853, 

 PI. LXXII, fig. 4; R. antillarum Kiitziug, 1849, p. 384 ; R. 

 lacustre forma americannm Wille, 1899, p. 149 ; "P. B.-A., No. 

 624; R. hicroglyphicum var. amciicanum Wolle, 1887, p. 144, 

 PI. CXXI, figs. 31 and 32 ; Rabenhorst, Algen, No. 2496. 

 Filaments not much curved or contorted, 10-25 p. diam., 2-5, 

 rarely 1-7 diam. long, cel!s sometimes inflated at the middle, 

 and of larger diam. there than given above ; wall not over 2 ^ 

 thick ; branches usually absent, when present, small, tuber- 

 cular or rhizoidal, rarely partitioned off from the cell. Fig. 119. 

 Mass., Conn., Pa., 111., Mo., Minn., Fla., W. I., Cal. 



Europe, Asia, So. America, New Zealand. 



A very common and variable species, including the greater 

 part of the fresh water forms. 



Var. MACROMERE;S Wittrock in Wittr. and Nordst., Alg. 

 Exsicc., No. 630; P. B.-A., Nos. 119, 1191. Cells 20-30 //. 

 diam., 5-12 diam. long. Mass., Conn., Cal. Europe 



Var. Hosfordii (Wolle) nov. comb.; R. Hosfordii Wolle, 

 1887, p. 145, PI. CXXII, figs. 13-16; P. B.-A., No. 719. Cells 

 36-40 /u, diam., 3-6 diam. long, membrane thick; branches 

 short, rhizoidal. Mass., N. Y. 



Quite different from the ordinary form of R. hieroglyphicum, 

 but connected by var. macromeres. 



8. R. CRISPUM Kiitzing, 1845, p. 206; 1853, PI. LXXI, fig. 

 i ; Filaments 12-22 p diam., usually much crisped, firm ; cells i- 



rarely 2 diam. long ; membrane thick, 3-4^ ; branches infre- 

 quent, unicellular or continuous with the cell, acute. Me., 

 N. J., Md. Europe. 



