1925] SetchcU-Gardner : Melanophyceae 395 



3. Sphacelaria californica Sauy. 



Plate 37, figs. 23-27 



Erect filaments forming light olive brown tufts, up to 3 em. or 

 more in height, naked for about 1 cm. below, attached by a small disk ; 

 joints with primary vertical and occasional, but irregularly placed, 

 secondary transverse partitions, up to 120/x diam. ; hairs and rhizoids 

 absent ; propagula broad, 140-160ja long, 80-120ja broad, without pro- 

 jecting rays or a single large cell projecting slightly at each of the 

 upper 3 corners; zoosporangia short, ellipsoidal to obovate, 75-150|a 

 long, 50-7 Oju. wide ; gametangia unknown. 



Growing on rocks, in pools, in the middle littoral belt. Southern 

 California (San Pedro to San Diego). 



Sauvageau, Remarques sur les Sphace., 1901, p. 92 (with ?). 

 Sphacelaria plumula var. californica Sauvageau, Joe. cit., p. 91, fig. 21 ; 

 Collins, Holden and Setchell, Phyc. Bor.-Amer. (Exsicc), no. 1694, 

 1910. S. trihuloides Saunders. Phyc. Mem., 1898, p. 158, pi. 26 (not of 

 Meneghini). 



Sphacelaria californica was suspected to be a distinct species by 

 Sauvageau w^ho described it {loc. cit.) under S. pluvmda var. cali- 

 fornica. He published, however, the binomial, Sphacelaria californica? 

 (loc. cit.), and it seems proper to attribute this combination to him. 

 The species, while close to S. plumiUa Zan., differs in having the lower 

 portion of the axis (for a centimeter or more) free from branches, in 

 having a basal disk and a straighter axis. Sauvageau 's plants were 

 more slender than those of S. plumula, but ours equal them in measure- 

 ment (up to 120j(x) ; many of our plants, however, have the smaller 

 measurements of those of Sauvageau. Secondary transverse partitions 

 occur in the joints of this species but they are occasional and irregu- 

 larly placed. The type locality is San Diego, California. 



4. Sphacelaria subfusca S. and G. 



Plate 37, fig. 28 



Erect filaments forming brown tufts about 0.5 mm. high, or slightly 

 higher, alternately but irregularly branching, penetrating slightly 

 among the superficial cells of the host by short thick rhizoids, not 

 forming a distinct disk; joints with primary vertical partitions only, 

 24-40/x high, 40-50ja wide ; hairs uniformly present and abundant, 

 single, seriate, opposite or secund, up to 8 cells in length, about 15fi 

 diam. ; propagula slender, with 2 or 3 slender rays, pedicel 8-12 cells, 



