On the Marine Algæ from \orth-East Greenland. 129 



in any species of Pilinia. By these hairs it resembles Arthrochœte 

 penetrans, and as the sporangia and the structure of the vegetative 

 cells are also similar, it might be referred to the same genus. It is 

 distinguished from the species named by the arrangement of the 

 filaments and the broader, often nearly globular sporangia. The 

 differences in the structure of the vegetative frond are probably 

 partly dependent on the differences in structure of the host plants. 

 In this respect the new species is too little known, owing to the 

 scarce material. 



Loc. OtT Baadskæret. 



Epicladia Reinke. 



51. E. Flustræ Reinke. 



K. Rosenvinge (18!)8 I) p. 115. 



The determination of the plants referred to this species is not 

 quite sure, as they were not fructiferous. They agreed with Reinke's 

 description and figures; the creeping filaments were partly confluent, 

 forming a membrane, and the cells showed here and there foldings 

 inward of the cell-wall. Found on Delesseria sinuosa and Desma- 

 restia aculeata. 



Loc. East Side oi" Koldcwey Island; Danmarks Havn. 



Gomontia Born, et Flah. 



52. G. polyrrhiza (Lagerh.) Born, et Flah. 



K. Rosenvinge (1893, p. 907, (1898 I) p. 101. 



In old dead greenish crusts of Lithothamnion lœuc and in shells 

 of Mya and Saxicava, in the latter case together with other perfora- 

 ting algæ (Conchocelis, Ostreobium) and as a rule in lesser quantity 

 than these. Found in 19 meters depth, at least. With sporangia in 

 the beginning of September. 



Loc. Entrance to the liarbour; along Vestre Havnenæs. 



Pseudeiuloclouiuiii Wille. 



53. P. submarinum Wille. 



Wille (1901) p. 29. 



In company with Calothrix scopulorum and other littoral algæ 

 a small alga was found which agreed well with Wille's description 

 and figures, as to the mode of growth, dimensions and structure of 

 the cells. The elongated cells were 5—6« broad; the cells contained 

 a parietal chromatophore. 



Loc. Vestre Havnenæs. 



