304 University of California Publications. [botany 



Apparently the northern limit of this species which is abund- 

 ant on the Californian coast. Miss Tilden's plant represents a 

 young form. As growing on the Californian coast, this species 

 at first forms a frond with smooth, veined surfaces. As the 

 plant matures, papilla? appear on the surfaces until they are 

 thickly covered. The tetraspores and cystocarps are formed in 

 these papilla? in a fashion similar to the method of formation in 

 Gigartina. Finally the surfaces wear away, leaving the veins as 

 coarse cords covered still with papilla?. This final stage might 

 not be recognized as belonging to the same plant as the earlier 

 ones. The two stages have been distributed in the P. B.-A, 

 under Nos. 50 and 588, while very young and depauperate plants 

 have been distributed in the Phykotheka Universalis, No. 606. 



J. G. Agardh, in his later work (1899, pp. 57-60), doubts the 

 accuracy of the determination of the plants referred to this species 

 by other algologists and finally proposes the name Polyneura Cali- 

 fornia for the one distributed more recently. The two plants 

 seem to differ, in sterile condition, by the more denticulate 

 margin, the more simple frond, and the more completely percur- 

 rent midrib of the original plant. Our specimeus, of the same 

 age, agree perfectly with the figure given by Agardh (1879, pi. 15, 

 f. 1) and it is possible to find in the same buuch of plants, speci- 

 mens agreeing equally well with all that he has said of his Poly- 

 neura Californica . In view of the Gigartinaceons cystocarp, it 

 is necessary to place this genus here rather than with the Dumon- 

 tiacea? where Schmitz placed it, and on account of the tetraspores 

 and cystocarps being borne in papilla? or proliferations, it seems 

 to take a position next to Gigartina. 



Phyllophora Brodiaei (Turner) J. Agardh. 



Arctic coast of Alaska, Harvey (1872, p. 463). 



In Rothrock's list, Harvey reports a single specimen of a 

 broad leaved variety of this species. 



Phyllophora interrupta (Greville) J. Agardh. 



Point Barrow, Alaska, Farlow (1885, p. 192, 1886, p. 474). 



Farlow reports that fine typical specimens of this species were 

 collected by Mr. John Murdock at this locality. 



