506 
ensia sat frequens«. In his herbarium in Copenhagen there is a Fseroese 
specimen of this variety from Thorshavn. 
Rostrup records it from Klaksvig. 
ACROSIPHONIA (J. Ag.) Kjellm. 
Before I try to describe those of Kj ell man’s species which I 
think I have been able to distinguish in my Fseroese material I 
must make a few short preliminary remarks. Kj ell man records 
a great many species in his standard work 1 on this s pec ies. 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 the help 
of this key and more particularly by the help of the numerous 
figures and the exhaustive descriptions I think, as I said before, I 
have been able to distinguish some of Kj ell man’s species in my 
Fseroese material; but, on the other hand, the occurrence of several 
forms has made it necessary to somewhat amend Kj ell 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. Speirogonicce is, e. g., described thus: — 
»Cellulse fertiles saltim ah initio sparsse, solitariae, binae vel ternae«. 
Sectio II, on the other hand, is characterized by »Gellulae fertiles 
jam ab initio 10—30 vel plures seriatae, series intercalares forman- 
tes«. But I have now found a great many examples which had 
from 1 to 10 and even more fertile cells in a continuous row and 
which, as must be remembered, excepting this agreed well with 
Kjellman’s description in Sectio I. Kjellman certainly writes 
»saltim ab initio«, but on consulting his description of species in 
Sectio I we find that he describes the species mentioned there as 
having at most 3 fertile adjacent cells in a row. The conclusion 
therefore is that the two sections must undoubtedly be united, from 
which again follows that at least some of the species referred to 
different sections will unquestionably prove to be allied. 
I think, on the one hand, that it is justifiable to emphasize 
the fact, that we owe Kjellman much in having pointed out to 
us several characters by means of which we can better than hitherto 
1 Kjellman, F. R.: Studier ofver Chlorophyceslagtet Acrosiphonia och dess 
skandinaviska Arter (Bihang till K. Svenska Vet.-Akad. Handlingar, Band 18, Afd. 
Ill, N° 5). 
