106 



always only monosporangia, but Kylin states (1907 p. 118) that tetrasporangia may 

 occur together with the monosporangia. The size of the sporangia was found to 

 be somewhat ditferent, the length varying from 11 to 19//, the breadth from 8 to 

 10 [J.. It seems however that tw^o groups of sporangia are distinguishable with re- 

 gard to the size, the one being 11 — 14// long, 8 — ■'da broad, the other 15 — 19// long, 

 9 — 10 ij. 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, 1 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 Algse, especially Laminarice, 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 Flnstra foliacea and once 

 on Liitorina 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 Hirslials, 11 to 15 met. Kn: XK, TX and TU 

 near Hirsliolmene ; Krageskovs Rev, 5 met. ; port of Frederilcshavn ; Busserev; Borrebjergs Rev; TP, 

 Tonneberg Bauiie, 16 met. — Ke: Lille Middelgrund, on Odonthalia, 17 to 19 met. — Sb: Kerteminde, 

 9,5 to 11,5 met., on Liitorina littorea. 



8. ChtHitransia attenuata sp. nov. 



Discus basalis bene evolutus, unistratosus, e fills repentibus confluentibus, cel- 

 lulis fere isodiametricis, constructus. Fila erecta sat numerosa, parce ramosa, api- 

 cem versus sensim attenuata, usque ad 550 /jf longa, basi 6,5 — 7 /^, superne c. 5 // 

 crassa, cellulis inferioribus diametro c. duplo, superioribus 3 — 4-plo longioribus. 

 Chromalophorum ut videtur unicum parietale, pyrenoide laterali instructum. Rami 

 sparsi vel oppositi. Crescentia apicalis sajpe sistitur, formatione pili vel sporangii (?), 

 et rami oppositi infra apicem extinctum egrediuntur. Monosporangia 7,5 — 9// longa, 

 4,5 — 6/i 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 



