THE BRYOPHYTA OF ICELAND 459 



79. Grimmia commutata Hubener. 

 Grimmia ovalis (Hedw.) Lindb. 



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

 supplement to "Isl. Kryptogamflora" (B. T., vol.20, p. 105) Gronlund 

 has recorded G. ovata from Myvatnshraun and G. commutata from Val- 

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

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

 Myvatn is Grimmia commutata and those from the two other localities 

 are G. ovata. Gronlund has. therefore, probably r confused the two 

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



80. Grimmia Doniana Smith. 



E. Iceland: Common from Hornafjordur to Seydisfjordur!. N. Iceland: 

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

 DVnjandi!. 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-lying districts of the 

 country 7 , 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 r grows in 

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

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

 hlid it occurs also on faces of tuff-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: Kolfreyjustadur (H.J.)!; Vallanes 

 (H. J.)!; Seydisfjordur!; Berufjordur!. N. Iceland: Hnausar in \ 7 atnsdalur !; 

 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. 



V 



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 Lagarfljot. 



30* 



