1920] Setchell^Gardner : Chlorophyceae 175 



seems to be inclined to refer here no. 628 of the Phye. Bor.-Amer. 

 from La Jolla, California, which was distributed under the name of 

 Codium Lindenhergii (cf. plate 31). We have examined the specimens 

 of no. 628 in our copies of the distribution. Altogether there are 

 three specimens available and all are much branched, rather broad 

 (up to 1.5 cm.) plants which seem distinctly flattened. The utricles 

 vary more than we have found to be the case in European C. tonien- 

 tosum. In fact there is almost a "dimorphism" and the occasional 

 larger type of utricle reaches a diameter of 150-330/x while the diam- 

 eters of the smaller, somewhat differently shaped, utricles range from 

 45-80/x or more. The walls of both sorts of utricles may be thickened 

 at the top, even to 28ju,. The gametangia (?) are broadly fusiform 

 and measure close to 200/x long and lOOju, wide. More information is 

 needed concerning these plants and it is hoped that further collections 

 may be made. They do not seem to belong to C. Lindenbergii since 

 they, although flattened, differ decidedly in details of branching and 

 in breadth. The utricles of C. Lindenhergii, as described and figured 

 by Kuetzing, are probably at least 250/a in maximiun diameter, and 

 in specimens distributed by Tyson (no. 55) occur up to at least 380/x, 

 in diameter, while the gametangia ( ?) are 200/a to 228jit long and 

 76ja to 95;u, wide. It should be mentioned, however, that there are 

 three flattened species described from Cape Colony, viz., C. Linden- 

 hergii Kuetz., C. danmecome (Bory) Kuetz., and C. platylohium 

 Aresch., usually combined (cf. J. G. Agardh, 1886, p. 46) under the 

 name of the first species, but possibly without good reason. 



Bornet (1892, pp. 216, 217) discusses at length a similar problem 

 connected with Schousboe's plants from Tangiers and refers C. Lin- 

 denhergii as a form with smaller utricles under C. elongatum Ag. 

 More has been said of this under C. decorticatum. 



In conclusion, we may say that we are not satisfied in referring 

 the plant of southern California (as represented by no. 628, Phyc. 

 Bor.-Amer.) to C. tmnentosum and feel that it is probably an unde- 

 scribed species. More experience with the living plant is needed, 

 however, satisfactorily to determine its exact status, 



6. Codium latum Sur. 



Plate 15, fig. G 



Thallus arising from a small, spongy disk, 15-25 cm. high, or more, 



the lower stipitate portion cylindrical, 3-5 mm. diam., 2-3 cm. long, 



more or less branched and abruptly flattened into broad, di-tricho- 



tomously branched lobes rounded at the apices; lobes 2-3 mm. thick 



