4'AC) jons. IJOYK l'KTERSKN 



Oli lli'iiiKicv I iilso foiind iU on woodwork s<» ncnr llic shorc llint 

 it coiild hv ihislicd l)y [hv salt watcr spray al any rate in storniy wcalhcr, 

 Init likewise on a l)ij{ stonc by Ihc sliore. 



T !•(• n I c po h 1 i a ceæ. 



Trentepohlia aurea L Mart. Ilariot 189(1. |). 192. 



Hi'lj;i .ItiiissDii mcntions (1900, p. 93) tliat thc species >is of com- 

 mon occiirrciu-c in tlu' iaintly li<4litc(i j^rotlos ol" tlic lava ficlds: hcrc it 

 grcw overywhcrc in the small lava holes, and often il was the only 

 |>iant of the j^rottos-. This is said aboiil Snæfellsnes. bul il probably 

 applics to olher parts of Iceland too. Unfortunately tbere is no collectcd 

 inaterial of the species, and as I have not lound it niyself, I have 

 nothin<^ to add. 



Trentepohlia sp. 



.\n iniperfectly dcveloped Trcnlepohlht was found on Heiniaey on 

 a large stone outsitie a cave at a height of abt. 2o m. It bore most 

 resemblance to T. iimhrind, but as no j^ametangia werc present, it could 

 nol be dclermined with certainly sample 100). 



Siphonoctadia les. 



CA n (I ophoraceæ. 



Rhizoclonium lapponicum Hrand. Brand 1913, |i. 180. 

 Veslmannacyjar 399, 410. 



In a rocky cave on Heimaey, abt. 20 m above the level of the sca 

 on highly calciferous sand wilh trickling watcr occurred green cushions 

 consisling of Vauchcria sphærosponi and a Rhizoclunium whicb seemed 

 to me to correspond quile well with 1{. htpjwniciim Brand. It formed 

 rip|)ling masses of lilaments, yellowish-green in the dried condition. The 

 lilaments were 30—39// thick. with cells IV2 times as long as they were 

 broad. The »bostrychoid« branching described by Brand was common, 

 but unicellular rhizoids were also present, while some of the pluricellular 

 short l)ranches formed rhizoid-like terminations. A similar form was 

 found on rocks below bird-dilfs on the same island. 



Si/)hon(iles. 



Va ucher i aceæ. 



Vaucheria borealis Iliin. llirn 1!)00. p. 87. 



K. Icel. 86, 93. 



.As Heering jjoiiits out (1907, p. 150), Vauchcria horealis bears a 

 grcat resemblance to V. pachijderma \\a\z. There seems, however, to be 

 a real difference betwcen the two species in the appearance of Ihe an- 

 Iheridium, which is lubular in the former, »beulelforniig in the latter. 

 However, V. pachijderma var. islandica Børgesen (1898, p. 137) has the 



