214 Vnivcrsity of California Publications in Botany [Vol.8 



eously determined, as stated above. We are, however, inclined to 

 refer here a specimen collected by one of us (Gardner, no. -JrlO-J:) at 

 Lands End, San Francisco, California. The specimens seem to agree 

 well with Harvey's fig-ure of Cladophora diffusa (1849, pi. 130) and 

 fairly well with the figure of Dillw^'n's Conferva diffusa (1803, pi. 21), 

 and possibly also with the plate of Roth (1800, pi. 7). The San Fran- 

 cisco plant is more slender than the type of the species, with less pro- 

 fusion of branches and branchlets, and, in this, agrees with Harvey's 

 C. diffusa. The synonymy, however, is too confused to be unraveled, 

 at least at present. 



7. Cladophora ovoidea Kuetz. 



Plants 5-15 cm. high, stiff, rather dull green ; filaments distantly 

 diehotomous, 150-200/x diam. below, branches becoming more lateral 

 and secund above ; upper ramuli not over GO/x diam., tips rounded or 

 slightly pointed ; segments in lower part cylindrical, 4-8 diam. long ; 

 above ovoid, 1.5-3 diam. long. 



Known only from Carmel Bay and Santa Cruz in California. 



Kuetzing, Phyc. Gen., 1843, p. 266, Tab. Phyc. Ill, 1853, pi. 92, 

 f. 1 ; Collins, Green Alg. N. A., 1909, p. 346. 



We have seen only specimens identified by Collins and have been 

 unable to compare them with European plants of Cladophora ovoidea. 

 Our specimens are coarse, of the same general appearance as those of 

 C. Huichinsi'ae. The branchlets, however, are much more slender 

 than the branches from which they spring and are, for the most part, 

 composed of four to six segments. The upper segments are more or 

 less ovoid. Our plants resemble reasonably" closely the figures of 

 Kuetzing (1853, pi. 92, f. 1). 



8. Cladophora MacDougalii Howe 



Plants rather stout, coarse and rigid, in strict tufts, dark or 

 yellowivSh green, 10-17 cm. high ; main filaments 135-310/x diam., 

 sparingly diehotomous below the middle of the tufts ; branching in 

 median and upper parts lateral, the branches erecto-patent, secund, 

 occasionally alternate, or very rarely opposite, becoming more or less 

 secund-pectinate toward the apices, the main axes commonly excurrent 

 beyond the last lateral branch as rather rigid tapering prolongations 

 10^0 segments long; the ultimate lateral branchlets 75-110/i, diam.. 



