438 University of California Publications in Botany [Vol.8 



31. Ectocarpus flocculiformis S. and G. 



Fronds densely caespitose, 0.75-1.5 mm. high, attached by inter- 

 twined, penetrating, rhizoidal filaments; erect filaments more or less 

 forked at the base, simple above or the largest plants with few, short, 

 alternate, acute ramuli, tapering slightly at the base, long-attenuate 

 upwards, not piliferous; cells cylindrical to slight doliiform, 20-25/* 

 diam., 1-2.5 times as long ; chromatophores numerous, angular-discoid 

 in the younger cells, rounded in the older cells; zoosporangia ellip- 

 soidal, 56-66/* long, 35-4% broad, on short pedicels near the base of 

 the erect filaments ; gametangia ovoid to ellipsoidal, numerous, sessile 

 or short-pedicellate, lateral near the base of the erect filaments, 

 95-110/* (up to 150/0 long, 30-45/*. broad. 



Growing on Codium fragile, the rhizoidal filaments penetrating 

 deeply into the host, among and beyond the utricles. La Jolla, 

 California. 



Setchell and Gardner, Phyc. Cont, VI, 1922, p. 409, pi. 47, fig. 24. 



The nearest relative of E. flocculiformis apparently is E. cylin- 

 dricus f. codiophilus. One marked difference between it and any of 

 the forms of E. cylindricus is in the shape and size of the gametangia. 

 This difference, along with others of less importance perhaps, though 

 apparently constant, seems to be sufficient to warrant keeping it 

 separate. 



32. Ectocarpus globifer Kuetz. 



Fronds 2-5 mm. high, pulvinate, sparingly branched, attached 

 by a few branched, rhizoidal filaments penetrating among the cells 

 of the host ; branches opposite or alternate, divaricate, constricted at 

 the base, attenuated above, at times piliferous; cells cylindrical, 

 slightly constricted at the dissepiments, 45-50/* diam. in the main 

 filaments, 0.5-1.5 times as long as the diameter in the middle, up to 

 4 times the diameter above and below; chromatophores numerous, 

 small, irregular discoid; zoosporangia lateral, spherical or subspher- 

 ical, mostly on 1-celled pedicels, 30-40/* diam.; gametangia lateral, 

 broadly ovoid to spherical, mostly on 1-celled pedicels, 70-100/* long, 

 50-70/* broad. 



Growing on Codium fragile. Southern California (San Pedro and 

 La Jolla). 



