228 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



seems to disintegrate more readily than in any other species 

 of Po7-phyra, with the exception perhaps of P. leiccosticta. 

 Consequently we find in the arrangement of the fully ripe 

 carpospores an irregularity such as is met with in the 

 arrangement of the antherozoids in P. leticosticta. The 

 carpospores arrange themselves along the lines of least 

 pressure, and consequently the whole group becomes spher- 

 ical and each carpospore more or less polygonal. 



Habitat. — On rocks. Zone ? August. 



Distribution. — As far as the author is aware, this species 

 has been reported but once, and that by Kjellman (1889), 

 its author, from Bering Island. Judging from the table of 

 distribution in the paper above referred to, P. variegata 

 seemed to be very local, and the impression was created 

 that it belonged to colder waters. Much surprise was there- 

 fore experienced when it was reported from San Pedro, 

 California. Later it was found at Coupeville, Washington 

 (^^c._33'^ 40' N. lat.). It was not observed in Alaska. 



Localities. — Bering Island (Kjellman) ; Coupeville, Wash- 

 ington (N. L. Gardner, No. 177!, No. 179!); Monterey 

 Bay, California (C. L. Anderson!, C. P. Nott, No. 863!, 

 Mrs. J. M. Weeks!); San Pedro, California (de A. 

 Saunders, No. 1206!, No. 1207!). 



15. Porphyra occidentalis Setchell & Hus. 



Plate XXI, Figs, isa-iyd. 

 Porphyra occidentalis Setchell & Hus, Zoe, Vol. V, 1900, p. 69. 



Fronds 15-30 cm. long, 1.5-5 cm. broad, linear, with slightly crenulate mar- 

 gin and a cuneate to orbicular base, sessile on small disc ; color dull red ; 

 fronds distromatic, vegetative part of frond, 45-75/^1 thick, cells square or 

 once and a half to twice as broad as high, i2-i5,a high, 12-30M broad, surface 

 jelly 10-15// thick; apparently dioecious, antheridia forming a yellowish margin, 

 measuring 65-75// ii^ cross-section, 64 antherozoids in 4 tiers of 16 antherozoids 

 in each antheridium. 



This species is known to the author by but a few speci- 

 mens collected by Mrs. Weeks at Carmel Bay, Monterey 

 County, California. The plant has very much the external 



