234 University of California Puhlications in Botany [Vol. 8 



We have preferred to use the generic name Capsosiphon of Gobi 

 (1879) rather than Ilea J. Ag. for several reasons. Fries founded 

 the genus Ilea in 1825 (p. 336) to contain various species which were 

 later found to belong to Enteromorpha Link (1820). The genus Ilea 

 was refounded by Fries in 1835 (p. 321) to contain two species, viz., 

 /. Fascia (Muell.) Fries and /. foeniculaceus (Huds.) Fries. If the 

 genus lieu is to be retained at all, it ought to be retained for Ilea 

 Fascia {PhyUitis Fascia Kuetz,), since Fries states (1835) that the 

 character of 7. Fascia was the one upon which the genus was really 

 founded. Finally the genus Capsosiphon Gobi (1879) was founded 

 two to three years before J. G. Agardh (1883, p. 114) resurrected the 

 name Ilea to confer it upon the Ulva aureola Ag. (1835, no. 29, pi. 29) . 



Capsosiphon fulvescens (Ag.) S. and G. 



Fronds 1-5 cm. up to 8 cm. high, thread-like, later becoming 

 tubular, up to 2 cm. diam., cylindrical or somewhat compressed, with 

 an occasional swelling, unbranched, or in age slightly proliferating; 

 cells roundish or oval with a thick membrane resembling the cells of 

 Gloeocapsa, 4— 5/* diam., arranged in long rows, 2-4 rows grouped 

 together. 



Growing on muddy rocks. St. Michael, Alaska. 



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

 fulvescens Agardh, Sp. Alg., 1821, p. 420. Ilea fulvescens, J. Agardh, 

 Till Alg. Syst., part 3, 1883, p. 115, pi. 4, f. 95-99; Collins, Green 

 Alg. N. A., 1909, p. 206, f. 71. Enteromorpha aureola Kuetzing, Tab, 

 Phyc, vol. 6, 1856, p. 14, pi. 40; Setchell and Gardner, Alg. N.W. 

 Amer., 1903, p. 214. Capsosiphon aureolum {sic!) Gobi, loc. cit. 

 Viva aureola Agardh, Icon. Alg. Eur., 1835, no. 29, pi. 29. 



Capsosiphon fulvescens, better known perhaps as Enteromorpha 

 aureola, was included in our previous account (1903, p. 214) as having 

 been found at St. Michael, Alaska by one of us (Setchell) intermixed 

 with Rhizoclonium riparium. The specimen, on reexamination, fails 

 to show a single filament of the Capsosiphon, hence its proper inclusion 

 in our flora must remain, for the present, a matter of doubt. 



We have chosen the specific name fulvescens rather than that of 

 aureolus, because J. G. Agardh (1883, p. 115) has stated that it be- 

 longs to this species, Viva fulvescens Ag. being a younger condilion, 

 while Z7. aureola Ag. is more developed. 



