408 A. HESSELBO 



20. Gymnomitrium revolutum (Nees) Phil. 



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

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

 Hypnum callichroum, Dicraniim Starkei, Scapania iiliginosa and Lophozia 

 Floerckei. 



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



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

 in rock-clefts associated with Lophozia alpestiis and Dicraniim Aiidersoni: 

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

 and mixed with Marsupella emarginata and Dicraniim Blytlii. 



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 sarmentosiim, Oncophorus virens, etc. ; Seljaland!, in 

 several piaces 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 jiilacea. 

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



23. Marsupella aquatica (Lindb.) Schiffner. 



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

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

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



24. Alicularia scalaris (Schrader) Corda. 



Very common over the whole of Iceland. 



Alicularia scalaris is one of the most commonly occurring Hepaticæ 

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

 higher mountainous regions. Fruit is rather common. 



It grows especiallj' 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 companj' with Pogonatnm urni- 

 genim. On warm clayey flals it also occurs abundanth', and forms 

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

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



