106. 
always only monosporangia, but Kyrın states (1907 p.118) that tetrasporangia may 
occur together with the monosporangia. The size of the sporangia was found to 
be somewhat different, the length varying from 11 to 19 y, the breadth from 8 to 
10 u. It seems however that two groups of sporangia are distinguishable with re- 
gard to the size, the one being 11—14y long, 8—9 y broad, the other 15—19y long, 
9—10 x broad, and one kind of sporangia is always only to be found on the same 
plant. As I have not found these differences of size connected with other differ- 
ences, I have not thought it necessary to distinguish the two kinds of individuals. 
It will be seen from the above that this species must be considered related 
to Ch. Thuretii; it differs from the asexual form of this particularly by somewhat 
thicker filaments, shorter cells and smaller sporangia being placed, at any rate in 
part, on repeatedly branched branchlets situated in the axils of the branches. 
The species occurs epiphytically on various Algæ, especially Laminariæ, on 
the stalks as well as on the blade, in particular on the borders of the segments 
of the digitate species; further it has been met with on Flustra foliacea and once 
on Littorina littorea. It has been collected in 1 to 23,5 meters depth. It is cer- 
tainly perennial or may be so. It has been found, in all cases with sporangia, in 
the months of May to December, in November and December in a great measure 
with empty sporangia. 
Localities. Ns: aD, 23,5 met. — Sk: N.W. of Hirshals, 11 to 15 met. — Kn: XK, TX and TU 
near Hirsholmene; Krageskovs Rev, 5 met.; port of Frederikshavn; Busserev; Borrebjergs Rev; TP, 
Tonneberg Banke, 16 met. — Ke: Lille Middelgrund, on Odonthalia, 17 to 19 met. — Sb: Kerteminde, 
9,5 to 11,5 met., on Littorina littorea. 
8. Chantransia attenuata sp. nov. 
Discus basalis bene evolutus, unistratosus, e filis repentibus confluentibus, cel- 
lulis fere isodiametricis, constructus. Fila erecta sat numerosa, parce ramosa, api- 
cem versus sensim attenuata, usque ad 550 y longa, basi 6,5—7 y, superne c. 5y 
crassa, cellulis inferioribus diametro c. duplo, superioribus 3—4-plo longioribus. 
Chromatophorum ut videtur unicum parietale, pyrenoide laterali instructum. Rami 
sparsi vel oppositi. Crescentia apicalis sæpe sistitur, formatione pili vel sporangii (?), 
et rami oppositi infra apicem extinctum egrediuntur. Monosporangia 7,5—9 u longa, 
4,5—6 » lata, in ramulis unicellularibus solitaria vel bina, vel in ramulis majoribus 
plura sessilia, pedicellata et terminalia conferta. 
This species has only been met with once, growing on Desmarestia aculeata 
dredged in the Limfjord in August, and was then in a rather advanced stage of 
development. As moreover I have had only rather few dried specimens for exa- 
mination, my description is in some respects incomplete; the species seems, how- 
ever, to be distinct from all known species. 
The well developed basal layer resembles that of Ch. Thuretii. As the most 
striking character may be mentioned the frequent occurrence of opposite branches, 
which, however, were only found when the growth of the filament was stopped 
