THE HKYOFHYTA OF ICELAND 413 



In the district around Isafjordur it is also niet witli abundantly on the 

 rocky flat, 500—600 metres above sea-lcvel, and near Akureyri it was 

 collected, altliough sparingly, near the snow-line (at about 770 metres alt.). 



39. Lophozia Floerckei (W. et M.) Schiffner. 



NW. Iceland: Dyrafjordur; Isafjordur; Hesteyri!; Grunnavik!; Kal- 

 dalon!; Arngcrdareyri!. S\V. Iceland: Svinahraun!. 



In the majority of the older lists of Bryophyta from Iceland L. 

 Floerckei is recorded from rather a considerable number of habitats, 

 but all the spccimens from these habitats preserved in the Botanical 

 Museum in Copenhagen, have been wrongh' determined ; the majority 

 of them must be referred to Lophozia lycopodioides. The onh' specimen 

 in the collections, correctly determined, was gathered by M5rch, but 

 no habitat is given. 



This species has a ver}' peculiar distribution as it is very common 

 in the north-west, and is also found abundantly on the highU' situated 

 Svinahraun in the south-west (about 300 metres), but has not otherwise 

 been found in Iceland. In NW. Iceland it ascends from the low land 

 to the rocky flat, but is most frequently met with from 200 to 400 

 metres above sea-level. There it grows on fairly dry ground in bil- 

 berry heaths, both on the ground and creeping over rocky blocks, as- 

 sociated with Dicraniim fnscescens, D. scoparium, D. molle, Lophozia lyco- 

 podioides and L. quinqiiedentata. At a higher level it grows especially 

 on the Salix-herbacea-hats, associated with Lophozia uentriosa, L. alpesti-is, 

 Dicranum Starkei, Pleuroclada albescens, etc, but also occurs on a more 

 damp bottom. 



In Svinahraun it occurred commonly between the lava-blocks and 

 also in a damp depression at the edge of the lava-field, associated with 

 Polytrichiim commune. 



40. Lophozia quadriloba (Lindb.) Evans. 



E. Iceland: Berufjordur!; Lon!; common near Seydisfjordur ; Val- 

 lanes!. X. Iceland: Husavik!; Akureyri!; about Ejjafjordur (O. D.; !). NW. 

 Iceland: Kaldalon!; Isafjordur!. W. Iceland: Melar (Grl.)!; Esja, several 

 piaces!. S. Iceland: Svinahraun!; Holt!; Hornafjordur!. The Vestmanna- 

 eyjar!. 



This plant is no doubt common, but usually it occurs so scantily 

 that it is only found by close search of the Bryophyte collections under 

 the microscope. It grows both on damp humus-covered rocks and on 

 boggy ground, from the low land upwards to the mountain-tops. Thus, 

 near Isaflordur it was collected at about 440 metres. Near Seydisfjordur 

 it is frequent up to about 500 metres and near Akureyri it was found 

 on clifl's at an altitude of 900 metres. 



Lophozia quadriloba hardly occurs in unmixed tufts, but always 

 mixed with other species, for instance with Dicranum spp. or on rocks 

 among Distichium montaniim, Tortella fragilis, Oncophonis, or with other 

 Hepaticæ such as Cephalozia, Lophozia alpestris and Aneiira pingiiis. On 



