347 



4. P. miniata (Ag.) Ag. Rosenv., 1. c. p. 826. 



/'. typica Rosenv., 1. c. p. 827. 



f. amplissima (Kjellm.) Rosenv., 1. c. 



/'. abyssicola (Kjellm.) Rosenv., 1. c. 



Alter having examined niv Færoese materialof this species I cannot 

 do otherwise than follow Rosen vin ge's definition of this species. 



To begin with /'. amplissima of this species, it occurs most com- 

 monly in detached, floating examples which attain a considerable 

 size, just in the same manner as, e. g. detached Monostroma fuscum 

 does in the inlerior of fjords, in which the former often occurs 

 intermingled with the latter, though it is also met with floating in 

 the open sea. 



With regard to /". abyssicola I mav remark that in Trangisvaag- 

 fjord opposite Tværaa I gathered some large and small spceimens 

 which grew attached to stems of Laminaria at a depth of about 

 5 fathoms, and which, except for their size, were exactly alike in 

 colour (pale rose-red) and habit. They diiTered from Kjellman's 

 (N. I., p. 191) description in having a distinct, short stipe, but this 

 was doubtless due to their habitat, as specimens growing, e. g. 

 amongst Corallina almost invariably have several eallus radicalis« 

 and no stipe. A transverse section of the smaller specimens showed 

 that these consisted of one layer of cells, but the larger specimens 

 of which I examined more particularly one measuring 50 ems., 

 consisted both of one and two lavers of cells. By far the greater 

 part, from the base to beyond the middle, appeared to consist of 

 one layer of cells, but some 10 ems. below the apex the thailus 

 consisted distinctly of two lavers of cells — and was liere quite 

 sterile. Taken as a whole the specimens were as yet almost sterile, 

 only a few had begun to develop <3 just at the margin of the thallus. 

 Hence I can form no opinion as to whether these specimens are 

 diæcious or not; Kjell man mentions that this is the case with 

 Porphyra abyssicola, but the latter character can hardly be regarded 

 as important (cfr. Foslie, Contribution I, p. 57 and Rosenvinge, 

 1. c). And Hus has recently published a paper 1 in which he savs: 

 »Porphyra abyssicola is monæcious (rarely diæcious).« Hus, who 

 curiously enough does not appear to know Rosen vin ges definition 

 (I. c), is of opinion that both /'. abyssicola and /'. amplissima ought 

 to be regarded as distinct species, and points out several characters 



1 Hus, H. T. A. : Preliminary Notes on West Coast Porphyras J.oe, vol. 4). 



