THE BRYOPHYTA OF ICELAND 443 



but the specimens in the Holanical Museum are wrongh' dcterniined; 

 most al' them must be referred to D. Starckel or D. anynsliim. 



Dicraniim mollc usually grows on damp gravelly ground on moun- 

 tain heights. In NW. Iceland it is one of the most commonly occurring 

 mosses on rocky flåts, and is common down to aboul 200 metres above 

 sca-level; but also frequently descends as far down as the bottom of 

 the Valley. It grows both on gravelly flåts soaked by melting snow 

 and on damp slopes; also on lower levels on heathy soil, with other 

 Duiannm spp. (D. scopariiun and D. fiiscescens), among Vaccinium, Em- 

 pctnim, etc, in large tufts which are usually closely interwoven with 

 Lophozia hjcopodioides, L. Kiinzeana, L. qiiinquedentatct , L. Floerckei, L. 

 veniricosa and other Hepaticæ. Near Modruvellir it grew partly on damp 

 gravelly ground, partly intermixed in abundance in Rhacomilriiim hijp- 

 /20/dt'S-heaths; in this latter locality also it was mixed with Lophozia spp. 



In lava-fields it usually grows in company with D. Slarckei, commonly, 

 as for instance in the clefts near Thingvellir, in cushions as much as 

 10 cm. deep. The piants from the latter locality and from Hafnar- 

 fjordurhraun are sometimes not quite typical and approach so closely 

 to D. Slarckei, that they can hardly be distinguished. The leaves are 

 sometimes orthophyllous, sometimes drepanophyllous. The fruit, which 

 is always present abundantly, ripens during July. In the district of 

 Isafjordur, however, ripe fruit was frequentl}- found as early as in the 

 latter days of June. 



27. Dicranum Bonjeani de Not. 



D. pahistre Br. eur. 



SE. Iceland: Hornafjordur!; Lon!. N. Iceland: near Eyjafjordur 

 (O. D.)!. W. Iceland: Dalasysla; Kctilstadr (H.'J.)!; Reykholtdafur (Grl. !); 

 Reykjavik!. 



The piants from all the above-mentioned localities agree exactly 

 with D. Bonjeani, but being quite sterile they cannot be determined with 

 perfect certainty. Bog-forms of Dicranum scoparium have often erect 

 leaves, slightly undulate at the apex, and are then extremely difficult to 

 distinguish from D. Bonjeani. This species grows in bogs, usually on 

 knolis, and is common around Reykjavik and near Hornafjordur. 



Note. In scveral older lists Dicranum undulatum is enumerated as 

 found in Iceland by Morch and is also recorded by G ro ni und from 

 Reykholt and Reykjavik, but all the specimens in the herbaria must 

 either be referred to D. scoparum or D. pahistre. 



28. Dicranum angustum Lindb. 



E. Iceland: Hornafjordur!; Berufjordur!; Lon!; Hof!. N. Iceland: 

 Myvatn (Grl.; determined as D. arc^/ciJ/??)!; Stadr near Hrutafjordur!. NW. 

 Iceland: Dynjandi!. W.Iceland: Stykkisholmur!; Reykjavik!. S. Iceland: 

 Asolfskalaheidi near Holt !, at an altitude of about 400 metres. 



This species is no doubt widely distributcd over the whole of Ice- 

 land; it is, at any rate, rather common in E. and S\V. Iceland, where 



29* 



