220 University of California Publications in Botany [Vol. 8 



Harvey, Characters new alg., 1859.a, p. 333 ; Collins, Green Alg. 

 N. A., 1909, p. 338, Mar. Alg. Vancouver Island, 1913, p. 104; Collins, 

 Holden and Setchell, Phyc. Bor.-Amer. (Exsicc), no. 729. 



As Collins remarks (1909, p. 338), this is "a soft, delicate, silky 

 plant, reminding one of the more delicate forms of C gracilis, but 

 distinct in manner of branching, substance and cell dimensions." It 

 seems possibly a not unusual plant about San Pedro, California. We 

 have compared our plants with a specimen collected by Yendo at 

 Hakodate, Japan, the type locality, and it certainly seems to come very 

 close to it, although careful study of a larger series of specimens might 

 show some essential differences. 



17. Cladophora delicatula Mont. 



Plants loosely tufted, soft, dull green, about 10 cm. high ; filaments 

 40-60/A diam. below, 4r-Q diam. long ; loosely branching, branches vir- 

 gate, erect; ramuli in short, secund series, seldom over 8 segments in 

 length, segments 20-30ju diam., 1-2 diam. long, joints somewhat con- 

 stricted. 



Growing on rocks along high water limit exposed to the svirf. 

 San Pedro, California. 



Montague, Crypt. Guyan., 1850, p, 302 ; Collins, Green Alg. N. A., 

 1909, p. 337 ; Collins, Holden and Setchell, Phyc. Bor.-Amer. (Exsicc), 

 no. 1582. 



The reference of these delicate plants to Cladophora delicatula is 

 on the authority of Collins. He is also inclined tQ refer here, with 

 some doubt, plants collected on shaded, sandstone rocks in quiet water 

 at Coos Bay, Oregon (Gardner, no. 2747). 



14. Spongomorpha Kuetz. 



Plants composed of profusely branched, monosiphonous filaments, 

 with terminal segments frequently larger and longer than the seg- 

 ments below, and usually blunt and rounded, though acute in some 

 species; intercalary divisions predominate, though divisions of the 

 apical segments may occur; in age the filaments are usually bound 

 tightly together in cushion-like or rope-like tufts by descending 

 rhizoidal branches below, or by special, short, spine-like or hooked 

 branches, segments uni- or plurinucleate ; chromatophore either a 

 thin, closed band, or a finer or coarser reticulum with few to many 

 pyrenoids. 



