vol.i] Setchell— Gardner. — Algce of Northwestern America. 305 



Ahnfeldtia plicata (Hudson) Fries. 



On rocks in the lower literal and upper sublitoral zones. 

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

 Island and Port Clarence, Alaska, Kjellman (1889, p. 30); St. 

 Michael. Alaska, Herb. I). C. Eaton, No. 16!; St. Paul Island, 

 Alaska, Supreehf (1851, p. 326, under Gymnogongrus fastigiatus 

 f. crassior!) ; Unalaska, Alaska, Ruprecht (1851, pp. 251 and 

 o 2 7 . under Gymnogongrus fastigiatus) ; Kadiak Island, Alaska, 

 Rupreelit (1851, p. 326, under Gymnogongrus fastigiatus f. 

 crassior) -. Prince William Souud and Yakutat Bay, Alaska, 

 Saunders (1901, p. 435): Sitka, Alaska, Postels and Ritprecht 

 (1840. p. 16, under Gigartina fasti giata) ; North Pacific Ocean, 

 Postels and Ruprecht (1840, p. 16, under Gigartina plicata); 

 Esquimalt aud Fuca Strait, Harvey (1862, p. 171) ; Port Renfrew, 

 B.C., Butler and Polley, Xo. 8 (in part) ; Whidbey Island, N.L.G., 

 No. 30! 



While it seems certain that this species is distributed along 

 the whole coast of North America, so far as our own experience 

 is concerned, it seems to be scarce. 



We do not know what to do with Ruprecht's species Gymnogon- 

 grus fastigiatus and its f . crassior, but refer it here with a feeling 

 that perhaps some of it may belong with the next. Schmitz 

 (1893, p. 394) seems inclined to reckon the Ruprecht plant as a 

 variety, at least, of A. plicata. 



Ahnfeldtia concinna J. Agardh. 



Port Renfrew, B. C, Butler and Polley, No. 27; west coast 

 of Whidbey Island, Wash., X.L.G., No. 35! 



A coarser species and, in No. 35, provided with cystocarps. 

 We have united under this name the A. concinna and the A. 

 Gigartinoides of J. G. Agardh. 



Sterrocolax crassior Schmitz. 



On Ahnfeldtia plicata, apparently parasitic. St. Michael, 

 Alaska, Herb. I). C. Eaton, No. 16! ; Unalaska, Alaska, Ruprecht 

 (1851. p. 327, as nemathecia of Gymnogongrus fastigiatus f. 

 crassior), Schmitz (1877, p. 394); Kadiak Island, Alaska, 

 Ruprecht (1851, p. 327, as in Unalaska specimen) ; Port Renfrew, 

 B. C, Butler and Polley, No. 81 (in part). 



