250 



306. B. pectangularis Wittr. 



Frodebo (Syd.); Sand and Grothusvatn (San do). 



307. B. gpacilis Pringsh. 



Grothusvatn (Sand 6). 



Order XXI. COLEOCHÆTACEÆ. 



308. Coleochæte scutata Bréb. 



Found growing on different fragments of piants in gatherings from 

 Grotliusvatn (San do); and tlie lake in Kvalbo Ejde (Syd.). 



309. C. Nitelleapum Jost. 



On Nitella opaca from different localities. Dr. O. Nordstedt de- 

 tected tilis species in some material of Nitella which I had sent to him 

 to determine. 



Order XXII. CLADOPHORACEÆ. 



310. Cladophora glomerata (L.) Kiitz. 



Lyngbye (Hydrophyt. p. 154) mentions this species under the 

 name of Conferva glomerata and says it occurs »in rivilis Færoen- 

 sibus«. In Lyngbye's Herbarium there are two specimens labelled 

 Conferva glomerata of which one was collected : in rivulo ad Qvalbo 

 and the other: ad Vaag, Sudero; I take both to be this species. 



Formå macrogonia Lyngb. 



Hydrophyt. p. 154, tab. 53. In Lyngbye's Herbarium there are 

 three specimens of which two were collected in a lake near Kvalbo 

 and one is labelled: »in lacubus alpinis, Færoæ«. A form which 

 quite agrees with Lyngbye's figure I have found in a gathering 

 collected by Professor Warming on Kalso. It forms small, dense, 

 erect tufts; the cells are 50 — 60 fi thick. 



Another specimen was collected by Ostenfeld in the lake in 

 Kvalbo Ejde, i. e. perhaps in the same locality whence Lyngbye 

 gathered his material, but it differs from it in being more unilate- 

 rall}^ ramified and in the cells being somewhat shorter. Lastly on 

 Hesto I found a form which bears a close resemblance to Lyngbye's 

 figure and has rather thick cell-walls. 



311. C. fracta (Dillw.) Kiitz. 



Mentioned by Rostrup (Fær. Fl. p. 87) as common in the Færoes. 

 I have not found this species in the material which I had for exami- 

 nation. 



