104 



angia-bearing branchlets. These were namely not restricted to the inner side of 

 the branches but occurred on all sides of the filaments and at various distances 

 from the base, and the sporangia were usually only 11 — 14/^ long, 7,5 — 8// broad; 

 one, however, was found to be 16 // long, 9,5 // broad. The sporangia were for a 

 great part emptied, and new were formed within the sporangial wall from the 

 underlying cell. As these specimens agreed otherwise with the f. agama, and as 

 they were found only in very small number, I may content myself with just 

 naming them here; it need only be pointed out that they showed short descending 

 filaments near the base. 



Ch. Thuretii j9, agama occurs in depths of 2 — 31 meters. In the Limfjord it 

 has been observed in depths of 2 — 7 meters, in the other waters only in depths 



greater than 9,5 meters. It has been found growing on 

 14 dilTerent species of Algae, as species of Polysiphonia, 

 stipes of Lamimtria, Delesseria sangrinea, Gloiosiphonia, 

 Desmarestia aculeata, Fucus serratus, further on Zostera- 

 leaves and on Husira foliacea. It has only been found 

 in the months June to September, except the above 

 named, somewhat aberrant specimens collected in May. 

 Ripe sporangia have been met with in all the months 

 named. 



I.ocalities. Ns: aF, ,S1 meters. Slv: ZK'-' off Lenstrup, 11 — 

 13 met.; (? N.W. of Hirshals, 13-15 met., May, no. 7109). ~ Lf: ZU. 

 3 met., and XU, 4 met , in Nissum Bredning; MH in Thisted Bredning; 

 oft' (ironnerup in Sallingsund, ca. 2 met.; LS and MI East of Mors. — 

 Kli: Herthas Flak, 20- 22,5 met. ( !, Bergs.); Frederikshavn ; ZL' N. 

 D of L.-esa, 9,5 met.; FF and TP, Trindelen, ca. 15 met. Ke: Fladen, 

 22,5 met. — Ks: EM, Lysegrund. — Sa: MQ, S. of Samsa, 11,5 met. — 

 Lb: N. of Fsena Kalv, 13 met. 



Fig. 33.^ 



Chantransia Thurctii jj. agama. From 

 TP. l^arts ol' tihinienls with crooked 

 l)raiu-hk'ls rising mostly i'min llic spor- 

 angileroiis l)r;inclilels. :i(Nl:l. 



7. Chantransia Daviesii (Dillw.) Thur. 



Thuhi-t in Le JoLis Liste p. 100; Kylin ,1907) p. 117 fig. 27. 

 Conferva Daviesii Dillwyn, Brit. Conf. 1809 p. 73, pi. F" (teste specim.). 

 Callithamnion Daviesii Harvey, Phyc. Brit. pl.314; J. Agardh Sp. Ill p. 8. 

 Acrochcetium Daviesii N.egeli (1861) p. 405 ; Bornet (1904) p. XXII. 



This species is as a rule easily recognizable by its fairly thick, thick-walled 

 and short-celled filaments and by its fasciculated sporangia-bearing branchlets. It 

 is undoubtedly nearest related to Ch. Thuretii which it may sometimes very closely 

 resemble, while it is very different from Ch. virgatula with which it was formerly 

 often confused. Although it was the first described of all the marine species of the 

 genus, it is imperfectly known in some respects, for which reason a short descrip- 

 tion of the Danish specimens may be given here. 



The basal part consists of branched creeping filaments which may become 

 so densely interwoven that they form a continuous basal disc. When the plant is 

 growing on an irregular surface, as e. g. the stalk of Laminaria hijperborea, the fila- 

 ments are very irregularly curved and may grow over one another, and the basal 



