414 University of California Publications in Botany [Vol. 8 



tangia are typically of Ectocarpus and while approaching in shape 

 those of E. silicidosus, yet they are less slender and less elongated than 

 is typical for that species and are not ordinarily prolonged into 

 terminal hairs. 



So far as we may judge from the scanty specimen in our copy, 

 no. 358 of Tilden's American Algae (from Pacific Grove) belongs 

 rather under f. parvus than f. variabilis, although the determination 

 as f . variahilis is attributed to Saunders, 



Ectocarpus confervoides f. typicus Kuckuck (Orthog. mut.) 



Fronds 1-10 cm. (ours 3-10 cm.) high, feathery, profusely 

 branched ; primary filament 25-32/1, diam., not constricted at the parti- 

 tions ; zoosporangia unknown ; gametangia abundant, alternate or 

 secund on the branches, sessile or upon a one to several celled pedicel, 

 40-80/x (up to 200jtt) long, 20-3 5ja diam. 



On wood and rocks. Alaska (Juneau) to California (San 

 Francisco). 



Kuckuck. Beitr. Kennt. Ect. Arten, 1891, p. 69, fig. 3; Setchell 

 and Gardner, Alg. N.W. Amer., 1903, p. 237 (excl. spec'n). 



It may be doubtful whether the f. typicus of Ectocarpus confer- 

 voides is, as yet at least, to be included in our account. We have 

 referred here three collections, one of which (no. 5197, W. A. Setchell 

 and A. A. Lawson, Juneau, Alaska) was listed by us previously (1903, 

 p. 237) under E. siliculosus f. typicus. It is a poor and unsatisfactory 

 specimen, but seems to belong here rather than where we referred it. 

 The other specimens are from Oregon and California and are small, 

 but have the more abundant branching of this form. 



Ectocarpus confervoides f. variabilis Saunders 



Plate 46, fig. 7 



Fronds forming more or less extended layers, 0.2-2 cm. high, 

 sparingly branched, branches alternate, distant, gradually attenuated 

 above ; main filaments up to 30/x diam., not constricted at the parti- 

 tions ; chromatophores large, band-shaped, few in each cell ; zoo- 

 sporangia ovoid, 60jU, long, 40ju, broad, single on 1-3-celled pedicels, 

 often on the same plant with the gametangia; gametangia abundant, 

 cylindrico-conical, fusiform to broadly ovoid, 75-225/x long, 16-35/a 

 broad, sessile or on 1 -few-celled pedicels, lateral or occasionally ter- 

 minal on a long pedicel from the basal filament, rarely seriate, terminal 

 or intercalary, on the long erect filaments, and up to 300/x. long. 



