1920] Setchell-Gard7ier : Chlorophyceae 159 



upon the relationships of the two plants. Concerning the type locality, 

 which is also the type locality for other species published by J. G. 

 Agardh in the same paper, it seems probable it is on the coast of the 

 state of Oajaca in the vicinity of Pochutla and Pt. de Huatulco. (See 

 Oersted in Liebmann, Chenes de I'Amerique Tropicale, 1869, p. viii.) 



2. Bryopsis hypnoides Lamour. 



Thallus 5-10 cm. high, flaccid, rather pale green, profusely and 

 variously branched; branches in no definite order, growing smaller 

 in the successive series, and with no sharp division between the lesser 

 branches and the pinnules that clothe them on all sides, the latter 

 themselves being frequently more or less branched; pinnules usually 

 long and slender, gradually attenuate at the apices, suddenly con- 

 stricted and symmetrically rounded at the bases. 



Growing on logs, floats, shells, stones, etc. Ranging from Victoria, 

 British Columbia, to San Pedro, California. 



Lamouroux, Mem. sur trois nouv, genres., 1809a, vol. 2, p. 135, 

 pi. 1, f . 2 a, b ; Setchell and Gardner, Alg. N.W. Amer., 1903, p. 230 ; 

 Harvey, Phye. Brit., 1846, pi. 119 ; Vickers, Phyc. Barb., 1908, p. 30, 

 pi. 53, f. 1, 2 ; Collins, Holden and Setchell, Phyc. Bor.-Amer. 

 (Exsiec), no. 1028. 



Only three illustrations of this species are available to convey an 

 idea of the characteristics of the species. The first, and only strictly 

 authentic illustration, is that of Lamouroux (1809a, pi. 1, f. 2 a, b). 

 Figure 2a represents the habit, while figure 2b shows the enlarged tip 

 of a pinnule. The plant is evidently polystichous with the ultimate 

 branchlets gradually attenuated in the lower third, or even half. The 

 second is that of Harvey in the Phycologia Britannica (pi. 119), which 

 does not represent the plant with sufficient detail to make as certain 

 as desirable the shape of the base and apex of the pinnules. It is 

 very evident, however, that the conception of Harvey was of a much 

 branched, polystichous plant with long slender pinnules which are 

 more or less constricted at the base and with the base itself unsym- 

 metrical. The third illustration is that given by Anna Vickers in 

 her Phycologia Barbadensis (pi. 53). The pinnules of this species, 

 both as to proportions and as to branching, seem very different from 

 those of both the others. The illustrations of the plumules (loc. cit., 

 f. 2) seem also to indicate that the gametes ( ?) are formed in restricted 

 basal segments of the pinnules. 



