442 University of California Puhlications in Botany [you 8 



family, these specimens were given a careful scrutiny with the result 

 that three species new to science were detected on a single specimen 

 of the host, viz., Streblonema corymMferwrn, S. anomalum, and S. 

 Johnstonae, all of which have been published {lo<e. cit.). 



The habit of each and the size of all the parts are so characteristic 

 that, notwithstanding their intimate association on the same host, they 

 can readily be distinguished. 8. corymhiferum is the most delicate 

 of the three. The very frequent grouping cf the gametangia into 

 corymb-like clusters is one of the most prominent distinguishing 

 characters of the species. Other species of this genus are as small or 

 even smaller. In size of parts, somewhat in habit and in habitat, it 

 resembles S. minuiissimnm Saunders found growing at Sitka, Alaska, 

 on " Liehmannia sp." (Saunders, 1901, p. 416.) 



2. Streblonema anomalum S. and G. 



Plate 52, figs. 1-3 



Fronds microscopic, more or less confluent ; filaments of the 

 prostrate portion penetrating among the cells of the host, moderately 

 and irregularly branched, much contorted, up to 16/^ diam. ; erect 

 filaments unbranched, mostly cylindrical, blunt in part, and piliferous 

 in part, 200-250/x long, extending beyond the surface of the host ; 

 hair filaments sparse, arising on the creeping filaments ; cells of the 

 creeping filaments more or less divided 1-2 times lengthwise in the 

 oldest parts, producing a polysiphonous filament 18-24ja diam. ; other 

 cells somewhat irregular in form, 8-llfi diam., at times slightly con- 

 stricted at the cross-walls ; cells of the erect filaments cylindrical, 8-9/j. 

 diam., quadrate ; chromatophore a single thin parietal band, unbroken 

 in the erect filaments, more or less broken in the creeping filaments ; 

 zoosporangia ellipsoidal, ovoid or nearly spherical, 40-60/x long, 28-35ja 

 broad, sessile on the creeping filaments; gametangia cylindrico-conical, 

 mostly blunt, 50-100/a long, 10-16;u, broad, sessile or short-pedicellate 

 on the creeping filaments, single or secund. 



Growing in Cumagloia Anclersonii (Farlow) S. and G. in com- 

 pany with Streblonema corymhiferum and ^S*. Johnstonae. San Pedro, 

 California. 



Setchell and Gardner, Phyc. Cont. V, 1922, p. 392, pi. 43, figs. 1-3. 

 Streblonema fasciculatum Saunders, Phyc. Mem., 1898, p. 148, pi. 13 

 (not of Thuret, in Le Jolis, Alg. mar. Cherb., no. 100, Liste, 1863, 

 p. 73). 



