506 A. HESSELBO 



FAM. BUXBAUMIACE.E. 



209. Diphyscium sessile (Schmid.) Lindb. 



Webera sessilis Lindb. 



Common in East, South and West Iceland, and rather frequent in 

 North-west Iceland, where it is common for instance in the district of 

 Dyrafjordur. In North Iceland it has not been found east of Blondudalur. 



It grows on firm, bare ground, especially on the top of knolls 

 or on small elevations of earth on slopes, where it forms low, dense 

 cushions, dark brown in colour; it is common, at any rate in E. Iceland, 

 as far upwards as 600700 metres above sea-level. Fruit, which oc- 

 curred only scantily in all places, was collected near Reykjavik, near 

 Lundur in West Iceland and near Geitaskard in Blondudalur. 



FAM. FONTINALACE.E. 

 210. Fontinalis antipyretica L. 



Found in all parts of the country and common on stones in brooks 

 and rivers, and sometimes also in stagnant water, up to about 300 400 

 metres above sea-level. Near Ljosavatn in N. Iceland it was found 

 abundantly in a river even at an altitude of 300 400 metres, and near 

 Isafjordur it occurred frequently as far upwards as 300 metres. It 

 varies considerably in size, leaf-form and colour. In stagnant water 

 (thus in very wet bogs near Jokulsfjordur) it becomes very robust, light 

 brownish-yellow, with broad leaves. 



In swiftly flowing water there often occur slender, dark-green or 

 brownish-green forms with strong metallic sheen, which agree most 

 closely with var. montana H. Mtiller. In such forms the basal angles 

 of the leaves are often somewhat concave, and formed of a single layer 

 of cells, in which respects it comes very near to F. gracilis. This species 

 is recorded Irom several localities by Gronlund, H. Jonsson and 

 Feddersen, but all the specimens which have been investigated belong 

 either to F. antipyretica or to F. androgyna. Only sterile specimens have 

 been found. 



211. Fontinalis islandica Cardot. 

 E. Iceland: Faskrudsfjordur (Jardin, 1865) (specimens not inspected). 



212. Fontinalis longifolia C. Jensen (Bot. Not. 1885, p. 83). 



"Gracilis, viridis et flavoviridis, elongata, mollis, rubricaulis, ramulis 

 brevibus, patulis subremotis. Folia laxa, imbricata vel erecto-patentia 

 mollia, carinata, annosiora, bifida, ovato-lanceolata, sensim longe acumi- 

 nata, integra vel ad apicem lenissime serrulata, decurrentia, cellulis 



