Ilß !.. K()I.I)i;iU 1' lioSKNVINCiK. 



specimen, collected Aug. lô"', has a soriis al llie base of Ihe old 

 lamina, and a new sorus is develoj)ing in the lower part of the new 

 lamina, bul in llie ollii'i- [)lanls coilecli'd in July and August a new 

 soius was yet not visible'. 



The muciparous canals are i)aiticularly well-developed in this 

 species; they form a network which is easily visible with the naked 

 eye in dried specimens and in s[)ecimens preserved in alcohol; they 

 become particularly conspicuous after staining with methylen-blue-. 



Loc. liensUaMel, 2 I inelers; along (-ape Bismarck l^eninsula; east side 

 of Koldewey Island; DanmarUs Havn; Baadskærel. 



I^'am. Cliordaccœ. 

 Chorda (Slackh.) 



27. Ch. tomentosa Lyngb. 



K. Rosenvinge (189:5) p. 8.-)4. 



In a gathering preserved in alcohol two small specimens of a 

 Chorda were found, intermingled among other algæ. They were 

 certainly sterile and feebly developed, but the hairs containing 

 numerous chromatophores showed them to belong to Ch. tomentosa. 

 They were about 5 cm. long and had not yet begun to develop the 

 outer, fertile layer. 



Loc. liay off Vesterdalen in a (lei)th of at most 1 meters, .\ug. 2<Sth. 



Fani. Dcsmarestidccœ. 



Desniarestia Lamx. 



28. D. aculeata {L.} Lamx. 



K. Rosenvinge (18rø) p. 857, (1898 I) p. 59; Jinisson (1904) p. 'à'2. 



Found a I several localities, but only abundant at one. One 

 specimen has the basal portion; in this the primary axis bears 

 below two pairs of opposite branches, while the branches otherwise 

 are always alternate. I have found the same in plants collected on 

 the shores of Denmark. Plants collected in the middle of Julv 



Jonsson found man\- specimens in Kruuses collections from East Greenland, 

 the lamina of which was divided into four parts (in one plant into five) and 

 he takes it for granted that these sections or laminæ have developed in four 

 (five) consecutive years. The fact that some of these plants bear a sorus or 

 mark after an emptied sorus on the uppermost section only, while the three 

 younger segments do not 3'et show an}^ trace of a sorus, (I. c. p. 28, fig. 2), sug- 

 gests the question whether more than one section maj"^ not exceptionally be 

 formed in the same year. 



While Areschoug (1883 p. 7i did not find muciparous canals in the lamina of 

 this species, Guignard (1892 p. 37) found them in all examined specimens, though 

 in some cases thej' were small and not easih' visible. 



