THE BRYOPHYTA OV ICELAND 537 



occurred abundanlly in scveral piaces, for instance in Esja, but onlv 

 sterile specimens were foiind. 



304. Hypnum callichroum (Brid.) Br. eur. 

 Stereodon callichrous Brid. 



E. Iceland: Seydistjordur!. NW. Iccland: Conimon everywhere!. 

 W. Iceland: Budahraun (H. J)!; Grundarfjordur (H. J.;!; comnion every- 

 where in the lava-fields east of Reykjavik and around HafnarfjordurI; 

 Svinahraun!; Esja, in G ri mm ia-heaih at an attitude of about 400 metres, 

 and in man}^ piaces along the banks ofstreams!. S. Iceland: Skalholt!; 

 Thingvellir! ; Holt!, common on tuff-slopes in clefts. 



Tilis species is common in the south-western part of Iceland, and 

 ver\' common in North-west Iceland. In North Iceland it has not been 

 found, and in East Iceland only near Seydisfjcirdur. It occurs in Ice- 

 land in two forms. The most frequent form is the typical bog-soil 

 form, which is exceedingly common especially in NW. Iceland. and 

 sometimes forms the bulk of the vegetation in damp situations, especially 

 along streams, on wet slopes and at the edge of bogs, usually in 

 association with Harpanthns, Lophozia quinqiiedentata , Cephalozia biciis- 

 pidata, etc. Around Isafjordur it occurs up to a height of about 

 300 metres, and in S. and S\V. Iceland up to almost 500 metres above 

 sea-level. 



Everywhere in the depressions and at the bottom of the clefts of 

 the lava-fields of South-western and West Iceland a mesophilous form 

 is found, which is distinguished by its size and by its almost regularh^ 

 two-rowed ramification. It grows in deep, loose and soft cushions, 

 either among grass or mixed with Hylocomiiiin spp., Rhacomitrinm hijp- 

 noides and species of Dicraiiiiin and of Lophozia. 



Fruit was collected only in Kaldalon in NW. Iceland: it was quite 

 undeveloped even at the end of June. 



305. Hypnum Lindbergii Mitten. 



Stereodon arcnatns Lindb. 



Very common. 



This species grows on wet ground, especialh^ in bogs, associatcd 

 with H. revolvcns. H. cuspidatnm, Hylocominm sqnarrosnm, Meesea, etc. : 

 but also on damp gravellj^ ground and on soil-covered rocks. It appears 

 lo be of almost equal frequency everywhere. Near Berufjordur it was 

 collected up to a height of about 500 metres above sea-level, and on 

 Eyjafjall in S. Iceland it was frequent at Ihe same height. Near Akureyri 

 it occurred abundantly on boggy ground even at an attitude of 500- 

 600 metres. Only sterile specimens have been found. 



Hijpnnm pralense is recorded by Gronlund from several localities, 

 bul the record is due to a confusion with H. Lindbergii. 



Nole. Hijpnnm incnrvatnm is recorded from Iceland by Morch, 

 bul the specimens in his collection belong to Plagiothcciiim piilchellum. 



The Botany of Iceland. Vol. 1, part. II. 35 



