248 



Rostrup (Fær. FL p. 88) points out that Hornemann in »Dansk økonomisk 

 Plantelære- p. 636 mentions that Lyngbj'e found Trentepoblia Jolithiis (L.) Wallr. 

 in the Færoes. But as Lyngb3'e does not mention it in Hydrophytologia and as 

 no specimens from the Færoes are to be found in Lyngbye's Herbarium and as 

 furthermore this species was not found during the researches of the later years 

 it cannot with any certainty be added to the list of the algæ from the Færoes as 

 Wille (1. c. p. 58) has done, though it is very probalile that this species may occur 

 in the Færoes it having been found in Iceland. 



285. Chætosphæridium Ppingsheimii Kleb. formå conferta Kleb. 

 Plate VIII, fig. 5. 



To this species I think I maj^ refer a small, interesting alga 

 which I found on some decayed Carex straws gathered from the 

 large lake near Sand (San do). 



It forms rather large discs consisting of roundish, sometimes 

 somewhat angular cells, the angles being formed by the cells pres- 

 sing against each other, all the cells have on their npturned side 

 a long, unjointed hair, which is enclosed in a sheath at the bottom. 

 Sometimes only the sheath has been found, the hair had probably 

 been broken off. Spiral hair did not occur (cfr. Klebahn in 

 Pringsheim's Jahrbiicher tome 24, tab. 4, fig. 14). Mucilage has never 

 been found and I have not seen the alga growing together with 

 Coleochæte. The processes connecting the cells figured and fully 

 described by Klebahn, were usually wanting or very little developed ; 

 yet a few isolated examples, loosely built, with less compact cells, 

 were sometimes found with well developed connecting processes 

 (fig. 5 b) which however did not attain to the size given by Klebahn 

 as that of the connecting processes of the typical Chætospæridiiim 

 Pringsheimii. Moreover, the contents and division of the cells judging 

 from the material preserved in spirit answer exactly to Klebahn's 

 description of »formå conferta«. 



Order XX. OEDOGONIACEÆ. ^ 



286. Oedogonium cryptoporum Wittr. 

 Frodebo (S yd. I 



287. O. capitellatum Wittr. 



Skopen (San do). 



288. O. psægmatosporum Nordst. 



Grothusvatn (S a n d 6). 



^ The determination of the Oedogoniaceæ 1 owe to Miss E. Hal las. 



