BoT.— Vol. II.] HUS—PORPHVRA. 215 



Reef, Marin County, California (W. A. Setchell, No. 

 1037!, No. 1276!, H. Hus, No. 80!); Farallon Islands, 

 California (T. W. Blankinship) ; Land's End, San Fran- 

 cisco, California (W. A. Setchell, No. 1118!, H. Hus!); 

 Monterey, California (W. A. Setchell, No. 5158!, C. P. 

 Nott!, Mrs. Bush!, R. E. Gibbs!, H. Hus!); Santa Cruz, 

 California (C. L. Anderson!); San Pedro, California (A, 

 J. McClatchie!) ; San Diego, California (Miss Reed, No. 

 107!). 



9. Porphyra amplissima (Kjellman) Setchell & Hus. 



Plate XX, Figs. i3«-i3<^. 



Zoe, Vol. V, 1900, p. 67. 



Porphyra amplissima (Kjellman) Setchell & Hus. Hus, Zoe, Vol. V, 



1900, p. 67. Gardner, in Phyc. Bor.-Amer., Collins, Holden & 



Setchell, Fascl. B, No. XLIX, 1901. 

 Diplodernia amplissimum Kjellm., The Algse of the Arctic Sea, p. 188, 



PI. 17, figs. 1-3; PI. 18, figs. 1-8, 1883. 

 Diploderma amplissimiim f. typica Foslie, Cont. to Knowledge of the 



Marine Algse of Norway, I, 1890, p. 56. 

 Wildemania amplissima Foslie, Cont. to Knowledge of the Marine Algse of 



Norway, H, 1891, p. 14. de Toni, Sylloge Algarum, Vol. IV, 1897, p. 24. 



Fronds membranous, 20-60 cm. long, 10-15 cm. broad, broadly elliptical 

 to ovate-lanceolate, with much undulate margins deeply folded, the folds usu- 

 ally reaching to the median line of the frond; color deep red-purple; base 

 slightly cuneate, sometimes cordate, sessile with small disc; fronds distro- 

 matic, 50-80/ji thick; cells in cross-section square or slightly higher than 

 broad, with rounded angles; surface jelly 5-10/^ thick; fronds monoecious, 

 antheridia and sporocarps intermixed in a marginal zone, sometimes together 

 with vegetative cells; each sporocarp consisting of 4 or 8 carpospores, each 

 antheridium consisting of 16 antherozoids. 



This alga is the Diploderma aniflissimuni of Kjellman 

 (1883), agreeing in every respect with both drawings and 

 description. It varies considerably in size. Kjellman sug- 

 gests that the greater size is due to the floating condition. 

 It is, however, doubtful if plants of this species continue to 

 grow after being torn away. The author, not having col- 

 lected this species, is unable to express an opinion, but 

 judging from the fact that plants of other species of 



