THE BRYOPHYTA OF ICELANI) 459 



79. Grimmia commutata Hiibener. 

 Grimmia ovalis (Hedw.) Lindb. 



N. Iceland: Myvatnshraun (St.) !. W. Iceland: Budir (H.J.)!. In the 

 supplement to "Isl. Kryplogamflora" (B. T., vol. 20, p. 105 Grønlund 

 has recorded G. ovala from Myvatnshraun and G. commntala from Val- 

 lanes and Kolfreyjustadr. But according to the specimens in the Bota- 

 nical Museum in Copenhagen, determined by C.Jensen, the plant from 

 Mvvatn is Grimmia commiilata and those from the two other localities 

 are G. ovata. Grønlund has, therefore, probably confused the two 

 names {G. ovata and G. ovalis) used by C.Jensen. 



80. Grimmia Doniana Smith. 



E. Iceland: Conimon from Hornafjordur to Seydisfjordur!. X. Iceland: 

 Holar (Grl.)!; Vidimyri (Grl.)!. NW. Iceland: Dyrafjordur!; Gnupsdalur!; 

 D\njandi!. Common in SW. and S. Iceland. 



With the exception of N. Iceland, where it appears to be rare, this 

 species is widely distributed in the more low-Iying districts of the 

 country, as it is only by exception that it ascends higher than 200 — 

 300 metres. Near Holt in S. Iceland it has, however, been collected 

 plentifully at about 500 metres above sea-level. It usually^ grows in 

 small, round tufts on loose blocks, more rarely in wide cushions, 

 irregular in form. In South Iceland proper — for instance near Dnings- 

 hlid — it occurs also on faces of tuflf-rock. The fruit, which occurs 

 everywhere, was hardly ripe even at the end of July. 



81. Grimmia alpestris Nees. 



E. Iceland: Arnkelsgerdi; Eidar (H.J.)!, sterile. S. Iceland : Hafurs- 

 holt!, fr. 



82. Grimmia ovata W. et M. 



Grimmia ovalis Lindb. 



Iceland leg Morch!. E. Iceland: Kolfreyj ustad ur (H.J.)!; Vallanes 

 (H.J.)!; Seydisfjordur!; Berufjordur!. N. Iceland: Hnausar in Vatnsdalur !; 

 Reykjaheidi!; Herjardalsheidi (Grl.)!. Only sterile specimens have been 

 found. 



This species grows on dry stones and rocks; it is rather frequent 

 in East and North Iceland, but has not been found in the other parts 

 of the country. 



83. Grimmia incurva Schwgr. 



E. Iceland: Vallanes!. 



It was growing in the above locality on a slightly inclined, partly 

 inundated rock-surface in the river Lågarfljot. 



30* 



