347 
4. P. miniata (Ag.) Ag. Rosenv., 1. c. p. 826. 
f. typica Rosenv., 1. c. p. 827. 
f. amplissima (Kjellm.) Rosenv., 1. c. 
f. abyssicola (Kjellm.) Rosenv., 1. c. 
After having examined my Fseroese material of this species I cannot 
do otherwise than follow Rosenvinge’s definition of this species. 
To begin with f. 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 interior 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 f. abyssicola I may remark that in Trangisvaag- 
fjord opposite Tvseraa I gathered some large and small specimens 
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 differed from Kj ell man’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 »callus 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 cms., 
consisted both of one and two layers 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 cms. below the apex the thallus 
consisted distinctly of two layers of cells — and was here quite 
sterile. Taken as a whole the specimens were as yet almost sterile, 
only a few had begun to develop d just at the margin of the thallus. 
Hence I can form no opinion as to whether these specimens are 
dioecious or not; Kjellm an 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 says: 
»Porphyra abyssicola is monoecious (rarely dioecious).« Hus, who 
curiously enough does not appear to know Rosenvinge’s definition 
(1. c.), is of opinion that both f. abyssicola and f. amplissima ought 
to be regarded as distinct species, and points out several characters 
1 Hus, H.T. A.: Preliminary Notes on West Coast Porphyras (Zoe, vol. 4). 
