408 A. HESSELBO 



20. Gymnomitrium revolutum (Nees) Phil. 



XW. Iceland: Sugandafjordur! at an altitude of about 200 metres). 

 It occurred here, on wet gravelly soil upon a slope, scantily among 

 Hypnum callichroum, Dicmmim Starkci, Scapania iiliginosa and Lophozia 

 Floerckei. 



21. Marsupella Funckii (W. et M.) Dum. 



E.Iceland: Hof!, in brownish-black cushions about one cm. high, 

 in rock-clefts associated with Lophozia alpestris and Dicranum Andersoni; 

 Seljaland! (at about 350 metres), on the ground between blocks of basalt 

 and mixed with Marsupella emarginata and Dicranum Blyttii. 



22. Marsupella emarginata (Ehrh.) Dum. 



NW. Iceland: Dyrafjordur on damp rocks at an altitude of about 

 250 metres!. S. Iceland: Holt! (at about 400 metres), on marshy ground 

 among Hypnum sarmentosum, Oncophorus virens, etc.; Seljaland!, in 

 several places from an altitude of 350 to 650 metres, both on gravelly 

 soil and on rocks. 



This species is recorded by Morch from Iceland (figured in Flora 

 Danica. tab 1945), and by Gronlund from Thingvellir and Hafnarfjordur. 

 The specimen from Hafnarfjordur has proved to be Anthelia julacea. 

 Morch's specimens are not to be found in the collections. 



23. Marsupella aquatica (Lindb.) Schiffner. 



NW. Iceland: Kaldalon! by the bank of a small lake intermixed in 

 a tuft of Hypnum sarmentosum and H. exannulatum- Isafjordur!, abun- 

 dantly in an almost dried up river, at an altitude of about 250 metres. 



24. Alicularia scalaris (Schrader) Gorda. 



Very common over the whole of Iceland. 



Alicularia scalaris is one of the most commonly occurring Hepaticse 

 in Iceland, and is of almost equal frequency in the lowlands as in the 

 higher mountainous regions. Fruit is rather common. 



It grows especially on a somewhat damp substratum, both on rocks 

 and on gravelly ground and also by streams and in bogs, sometimes 

 as pale green or in exposed localities brownish mats, sometimes 

 sprinkled in the tufts of other Bryophyta. On peaty ground it often 

 forms extensive, continuous carpets in company with Pogonatum urni- 

 gerum. On warm clayey flats it also occurs abundantly, and forms 

 together with Haplozia crenulata dense, reddish-brown or pale green 

 mats along the warm water near both sulphurous and alkaline springs. 



