254 



according to Kjellman are wanting in Æ. Martensii I must remark 

 that though I have had many cænobia for examination I have, as 

 mentioned above, only once come across such a basal body, this, 

 at all events proves that they are rare. 



To this species I think we may furthermore refer the Færoese 

 species which are to be found in Lyngbye's Herbarium under the 

 name of Conferva ægagropila and with regard to vs^hich Lyngbye 

 (l.c. p.l51) writes: »In lacu prope Vay Suderoe Færoæ copiosissime, 

 totum fundum lacus, quantum e ripa videre licuit, globulis suis 

 numerosissimis denso crassoque velamine ubique tegens, etiam in 

 ripam ejecta, sed nunquam in aquæ superficie natans«. True, 

 Lyngbye's description also suits Cladophora Saiiteri to which spe- 

 cies Wille (1. c. p. 59) has referred Lyngbye's Conferva ægagropila, 

 but the faet is that Lyngbye has mentioned several species collec- 

 tively under this name, also Ægagropila Saiiteri, as specimens of 

 this species are to be found in his herbarium (from the well-known 

 habitat in the lake of Soro) and it is to these specimens that his 

 description and figures at least partly refer. 



314. Rhizoclonium hieroglyphicum (Ag.) Kiitz. 



Lat. fil. - 20—26 ^. 



Found in material from Midvaag (Vaago); and in a gattiering from 

 mountain heights on Bordo (450 m.;. 



315. R. pachydepmum Kjellm. /3 tenuior Kjellm. Plate X, tig. 2. 

 Kjellman: The Algæ of the Arctic Sea p.310. Rovenvinge: Grøn- 

 lands Havalger p. 911. 



Amongst moss in a ravine near Tværaa Professor Warming 

 has collected a Rhizoclonium which I think may be referred to 

 the above -named species. This alga, which Kjell man found 

 on the shores of Nova Zembla and Wormskiold — according to 

 Rosenvinge ^ in Greenland (unfortunately the specimens in the 

 herbarium in Copenhagen is wanting in nearer indication of habitat 

 and way of growth), occurs in the Færoes in freshwater. This fresh- 

 water form from the Færoes agrees on the whole with Kjellman 

 and Rosenvinge's descriptions, but some smaller differences are to 

 be found of which I shall especialiy mention that the cells are 

 generally longer, the cell-walls thinner and the breadth of the fila- 

 ments smaller. The breadth of the older filaments varies with an 

 average of about 30 jw, often smaller than broader. In the older 

 filaments the cell-wall attains a thickness 3—4 /^, but is considerably 



