— 18G — 



have seen, from America^), are, as also has been pohiled out by Borgesen 

 (Faer. Alg. p. 468), fully agreeing with the specimen in Aresch. Exsicc. 

 No. 401. Fucus edentatus De la Pyl. belongs consequently to the main 

 form of F. inflatus L. According to Strcimfell (1. c.) an original specimen 

 of F. edentatus De la Pyl. is to be found in J. Agardh's herbarium. 

 J. Agardh was of opinion (Stromfelt 1. c.) that some of Stromfelts Icelandic 

 specimens (E. evanescens * edentatus Stromf. 1. c.) had a resemblance to 

 it. I have seen Stromfelts Icelandic specimens in question, and some of 

 them are, I think, to be placed near to F. furcatus Aresch., some are 

 transitional forms to F. evanescens G. Ag., and other are approximately 

 agreeing with the last-named species. It is thus possible that the men- 

 tioned original specimen resembles F. evanescens G. Ag. 



J. Agardh (cfr. above p. 185) has already noticed transitional forms, 

 and Kjellman (Arct. Alg. p. 203) remarks that he has seen specimens of 

 F. edentatus Kjellm. (= F. furcatus Kleen) "very nearly approaching" 

 F. evanescens Kjellm. and on the other hand forms of F. evanescens 

 Kjellm. "much resembling" F. edentatus Kjellm. Further Stromfelt (1. c.) 

 has noticed the common transitorial forms, and under a name of F. 

 evanescens G. Ag. lim. dilat. he unites F. evanescens J. Ag. and F. 

 furcatus Kleen. The enlarged F. evanescens Stromf. is further by him 

 divided into four subspecies: * arcticus Stromf. (= F. evanescens Kjellm.), 

 *norvegicus Stromf. (=^ F. furcatus Kleen, and consequently also including 

 F. edentatus De la Pyl.) , * edentatus Stromf. (non F. edentatus De la 

 Pyl. cfr. above) and * dendroides Stromf. (= a transitional form between 

 the main form and f. exposita of F. inflatus, closer connected to the 

 former). Uniting the named species Stromfelt takes them as they have 

 been limited before, and he does not observe that the species, which he 

 unites, are partly identic, and therefore it is most natural that he comes 

 to the conclusion that smaller specimens of the dwarf forms, f. nana of 

 *arcticus and f. contracta of * norvegicus, are fully resembling one an- 

 other. 



Under the name of F. inflatus L. K. Rosenvinge (Grl. Havalg. 1. c.) 

 also unites F. edentatus De la Pyl., F. edentatus Kjellm. {= F. furcatus Kleen) 

 and F. evanescens Kjellm., moreover he includes F. linearis Oed. Fl. Dan. 

 (with the syn. : F. filiformis Gmel., F. distichus auct. salt, ex parte and F. 

 divergens J. Ag.). Rosenvinge divides the species in three varieties : var. 



') Hauck et Richter: Phycotheca universalis No. 119. The specimen is col- 

 lected by Frank Collins at Marblehead „ about at low-water mark on the 

 most exposed rocks". Another specimen, which I have seen, is gathered 

 by Dr. Delamave at Miquelon. The specimen in Phycotheca Boreali-americana 

 Fasc. A. No. XIII is less typical. 



