506 



ensia sat frequens«. In his herbarium in Copenhagen there is a Færoese 

 specimen of this variety from Thorshavn. 

 Rostrup records it from Klaksvig. 



ACROSIPHONIA (J. Ag.) Kjellm. 



Before I try to describe those of Kjell man' s species which I 

 think I have been able to distinguish in my Færoese material I 

 must make a few short preliminary remarks. Kjell man records 

 a great many species in his standard work 1 on this species. They 

 are described and figured very accurately and divided into two 

 subgenera, and then again subdivided into sections; he further 

 gives a key to the determination of the species, and by tbe help 

 of this key and more particularly by the help of tbe numerous 

 figures and tbe exhaustive descriptions I think, as I said before, I 

 have been able to distinguish some of Kjell man 's species in my 

 Færoese material ; but, on the other hånd, the occurrence of several 

 forms has made it necessary to somewhat amend Kjell man' s 

 systematic classification of this genus, as, at any rate, the charac- 

 ters which Kjellman utilises for his sections have proved to be un- 

 maintainable. Sectio I. Speirogonicæ is, e. g., described thus: — 

 »Cellulæ fertiles saltim ab initio sparsæ, solitariæ, binæ vel ternæ«. 

 Sectio II, on tbe other band, is characterized by »Cellulæ fertiles 

 jam ab initio 10 — 30 vel plures seriatæ, series intercalares forman- 

 tes«. But I have now found a great many examples which had 

 from I to 10 and even more fertile cells in a continuous row and 

 which, as must be remembered, excepting this agreed well with 

 Kjell man's description in Sectio I. Kjellman certainly writes 

 »saltim ab initio«, but on consulting his description of species in 

 Sectio I we find that be describes the species mentioned there as 

 baving at most 3 fertile adjacent cells in a row. The conclusion 

 therefore is that the two sections must undoubledly be united, from 

 which again follows that at least some of the species referred to 

 different sections will unqucstionably prove to be allied. 



I think, on tbe one hånd, thai it is justifiable lo emphasize 

 the faet, that we owe Kjell man much in baving pointed out to 

 us several characters by means of which we can better than hitherto 



1 Kjellman, F. R.: Studier ofver Chlorophycéslågtet Acrosiphonia och dess 

 skandinaviska Arter (Bihang till K. Svenska Vet.-Akad. Handlingar, Band IS, Aid. 

 III, No 5). 



