THE BRYOPHYTA OF ICELAND 441 



In Iceland Dicranum Andersonii is i\ decidedly lowland plant, which 

 is probably widely distributed in the southern and south-eastern parts 

 of the country. It occurs especially near the coast; in the interior of 

 the country it has been found only near Thingvellir, where it grew very 

 sparingly on a lava block in company with D. fulvellnm, which it 

 resembles in the fact that the peristome teeth are wide-spreading when dry. 

 Dicranum Andersonii is however easily distinguished by its shorter seta 

 and by the extremely thick-walled cells of the capsule-walls and by the 

 absence of stomata. 



23. Dicranum falcatum Hedw. 



E. Iceland: Lonsheidi!, at an altitude of about 400 metres; Beru- 

 fjordur!. N.Iceland: Ljosavatnsberg!. NW. Iceland: Dyrafjordur!; Isa- 

 fjordur!. W. Iceland: Snaefellsnes: Saxarhol (H.J.)!; Frodarheidi (H.J.)!; 

 Reynivellir (Grl.) ! ; Svinaskard (Grl.) ! ; Kolvidarhol ! ; Esja !. S. Iceland : Holt ! ; 

 Seljaland!. The plant is recorded by Morch from Iceland and figured 

 in Flora Danica, tab. 2003, but Morch's specimens in the Botanical 

 Museum in Copenhagen belong to Dicranoweisia crispala. 



Dicranum falcalum is a plant characteristic of the damp gravelly 

 flats of mountain heights, where it often occurs abundantly in large, 

 compact, rounded cushions in the neighbourhood of patches of snow. 

 Usually it is not met with until an altitude of about 600 metres; near 

 Kolvidarhol, however, it was common even at an altitude of about 400 

 metres. This species is very common in NW. and in S. Iceland and 

 occurred also abundantly on Ljosavatnsberg. It is probably common 

 everywhere on mountain heights, but, as for instance in E. Iceland, it 

 has only been collected scantily, as its habitats are snow-covered in 

 June when that part was explored. 



The fruit, which is always present abundantly, ripens about the 

 middle of July. 



24. Dicranum Blyttii Schimp. 



Dicranum Schisti (Gunn.) Lindb. 



E. Iceland: Hamarfjordur!. N. Iceland: Reykjaheide!; Vidvik (P. S.)!; 

 Hof (O. D.)!. NW. Iceland: Patreksfjordur (Wiinstedt)!; Glama (St.)!, com- 

 mon on mountain heights!. W. Iceland: 0xarrhyggur!; Svinahraun!; 

 Hafnarfjordur!. S. Iceland: Seljaland!, from an altitude of 350 metres 

 upwards; Holt!, common on mountain heights; Thingvallahraun !. 



This species is common, at any rate in NW. and SW. Iceland, while 

 it has been found but scantily in E. Iceland and only in a few localities 

 in N. Iceland. But the same is probably the case here as mentioned 

 for Dicranum falcatum, that its habitats, at the time when E. Iceland 

 was explored (June 1909), were covered with snow. 



Dicranum Blyttii belongs to the Alpine region and is not met with 

 until an altitude of 300 400 metres. Near Hamartjordur, however, it 

 grew in the lowlands on rocks near the coast. It grows partly on 

 stones and partly on gravel, and is especially frequent at a height of 

 600800 metres, both on gravelly flats soaked by the melting snow, 



The Botany of Iceland. Vol. I, part II. 29 



