438 JOHS. HOVK PETERSKN : THK AKIUAL ALGÆ OV ICELANI) 



Wlu'ii I visitcd thc same loc«lity in 191 J. I foiind similar condi- 

 lions. A siiKill strcnni fldws out by tlic mondow. llie inoiilli of wliicli 

 has becDiiH' riinnol-sliapi'tl owinj^ lo Ihc slr<)iij4 lides, with aii enoniioiis 

 bed in i)ro|)ortion lo ils voliiine of waler. On tlic slo|)in{^ sides {»rew 

 \'. splHvrosponi . Ibrniin«^ connedcd, somewhat liifled <^r()\vths on thc 

 nniddy bottom. niirin;« iiigh tide tiiesc f^rowUis will be llooded witii 

 sall water. » l'i^. 1. p. 357 . in Ihe same way il <4re\v in a small slreani 

 ciillin}^ Ihc littoral nicadow, and in a de|)ression wilh othcrwise nakcd 

 claycy botloni, in l>olh placcs under such condilions Ihal il must be 

 tloodcd wilh sall waler al hif^li lide. 



Thc species must bc desij^naled as a lialophilous species , hardly 

 {»rowin'4 mucli above high waler mark. 



Vaucheria terrestris Lyn-^b. Heering 1907, p. 160. 



N \V Icel. 264. 



I iiave only mel with Ibis species in one placc, viz. on a road 

 ncar Isafjon^ur. As in Denmark Boye Petersen 1915, p. 349), so also 

 in Iccland il seems to be of rarcr occurrence than V. tiamulu. 



RHODOPHYCEÆ. 



Rhodochorton islandicum Hosenv. 

 Kolderup Hosenvinge 1900, p. 61. 

 H.Jonsson 1<»]1. p. 119. 



This species I have mentioned on p. 363, and I have nothing to add. 



