146 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



from Chondrus, to which several of tlio species were formerly referred, by the structure 

 of the frond and the arrangement of the tetraspores ; from Phyllophora by the absence 

 of a stipe and the immersed cystocarps. ' 



G. Xorvegigus, J. Ag. (Splucrococctts Norvegicus, Ag. — Chondrus 

 Norvegicus, Lyngb. ; Phyc. Brit., PI. 187. — Oncotylus Norvegicus, Kiitz.) 



Fronds deep red, two to four inches high, linear, dichotoinous, flat, 

 fastigiate, axils rounded, patent, apices obtuse; cystocarps immersed 

 in the upper segments projecting on both sides of the frond; neina- 

 thecia sessile, hemispherical, on both sides of the frond. 



In deep pools on rocks. 



Penobscot Bay, Mr. Hooper; Peak's Island, Maine, W. G. F.; Nahant, 

 W. G. F. ; Beverly, Mass., Miss Alexander. Europe. 



Our plant, which is apparently rather rare, is the same as that of Europe, although 

 narrower forms are sometimes seen which perhaps might be referred to the G. Torreyi 

 of Agardh. G. Griffithsicn is to be expected with us, as it is common in Europe. The 

 present species is found only in the autumn and winter, either in deep cold pools or 

 below low-water mark. Its resemblance to the simpler forrus of Chondrus crispus is so 

 great that it is perhaps mistaken for that species by amateur collectors. Its color, 

 however, is red rather than purple, and the whole plant is thinner and more delicate 

 than C. crispus, which, moreover, has quite a different microscopic structure. 



G. Torreyi, Ag. 



Frond compressed, flattish, dichotoinous, fastigiate, segments linear, 



very narrow, the axils rounded. 



2vew York, Prof. Agardh. 



A species known only by the above description of Agardh. Bailey, in Am. Jour. 

 Sci., Vol. VI, 1848, p. 39, makes the singular statement, in speaking of Dasya elegans, 

 Ag., that he has examined a fragment of the original specimen of Splwrococcus Torreyi 

 in the Torrey Herbarium, "which," he says, "unless I am greatly mistaken, was 

 founded on a battered specimen of this plant." 



AHNFELDTIA, Fries. 



(Named in honor of Nils Otto Ahnfeldl, of Lund.) 



Fronds cartilagineo-corneous, subterete, dichotoinous or irregularly 



branched, composed of densely packed elongated cells within and a 



horizontal layer of closely packed short filaments formed of small colored 



cells ; cystocarps immersed in the fronds ; tetraspores in nemathecia 



which surrounded the branches (?). 



A small genus, comprising stiff, wiry, or cartilaginous algte, whose fructification is 

 not well known. As it is, the genus is distinguished from Gymnogongrus rather by the 

 rigidity and terete character of the fronds than by any more definite character, since 

 the fact that the tetraspores in the present genus are in the nemathecia which surround 

 the branches, even if fully proved, which is not the case, would hardly constitute suf- 

 ficient ground for the sepai'ation of the genera. In the only common species of the 

 North Atlantic cystocarps have never been seen and the nemathecia have not been 

 satisfactorily examined. In Ahnfddtia gigartinoides of the west coast the cystocarps 

 form nodose swellings in the upper part of the branches, and there are numerous car- 



