300 University of California Piihlicafions. Ibotany 



A dwarf form closely approaehiiio' tlic i)i-ccedin<4' in its larger 

 conditions. 



Iridaea laminarioides f. punicea (P. & R.) Setchcll .md 

 (jiardner coml). no v. 



On rocks, upper sublitoral zone. Unga, Alaska, A.A.L., No. 

 5050!; Sitka, Alaska, Pastels and Ruprecht (1840, p. IS); west 

 coast of Whidbey Island, Wash., X.L.G., Xos. GO!, 142!, 14:5!, 

 150!, 154!, 292!, 293!; San Juan Island, Wash., Tildni. No. 

 328a, under /. layuinarioiihs. 



A large form often a meter or two in length and of an exceed- 

 ingly bright red purple color. It has been found with both 

 cystocarps and tetraspores. It is not uncommon in Puget Sound 

 and extends southward to Port Harford, San Luis Obispo County, 

 California. 



Iridaea obiongifructa Setchell 



Cast ashore and growing on the stipes of Pleurophycus and 

 Pterygophora in the sublitoral zone. West coast of Whidbey 

 Island, Wash., N.L.G., Nos. 56!, 283! 



A large species, reseni])ling jSV/rroyj /;////? .s Califoriiica in appear- 

 ance, l)ut with olilong cystocarps. This may be a species of 

 Callymenia, but the habit does not agree with that genus. It is 

 found l)ut seldom and only a few specimens are accessible to us. 



Rhodoglossum latissimum -1. Agardh. 



In the sublitoral zone. West shore of Whidl)ey Island, 

 Wash., X.L.G., Nos. 101!, 140! 



Only a few specimens have been found and these are cysto- 

 carpic. Consequently, the genus must remain in doubt, since the 

 difference between Iridtea and Rhodoglossum depends upon the 

 character of the tetrasporic sorus. The fronds are thin, the 

 cystocarps regular and circular, and evenly distributed over the 

 frond. It resembles in these respects the plants from the Calif or- 

 nian coast referred to this genus. It has seemed best to us to 

 retain J. O. Agardh's genus Rhodoglossum, since in habit, to 

 some extent, and especially in the structure of the sorus, it is 

 amply distinct from h-ida'a. 



