THE BRYOPHYTA OF ICELAND 537 



occurred abundantly in several places, for instance in Esja, but only 

 sterile specimens were found. 



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

 Stcrcodon callichrous Brid. 



E. Iceland: Seydisfjordur!. NW. Iceland: Common everywhere!. 

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

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

 Svinahraun ! ; Esja, in Grz/mnz'a-heath at an altitude of about 400 metres, 

 and in many places along the banks of streams!. S. Iceland: Skalholt!; 

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



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

 very common in North-west Iceland. In North Iceland it has not been 

 found, and in East Iceland only near Seydisfjordur. 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 Harpanthus, Lophozia quinquedentata , Cephalozia bicus- 

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

 300 metres, and in S. and SW. 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 regularly 

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

 either among grass or mixed with Hylocomiuni spp., Rhacomitrinm hyp- 

 noidcs and species of Dicranum 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. 



Stcreodon arcnatiis Lindb. 

 Verv common. 



mj 



This species grows on wet ground, especially in bogs, associated 

 with H. reuolvens. H. ciispidatum, Hylocomiam s<jnarrosiim, Meesca, etc.; 

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

 to 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 the same height. Near Akureyri 

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

 600 metres. Only sterile specimens have been found. 



Hypnnm pratense is recorded by Gronlund from several localities, 

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



Note. Hypnum incurvatnin is recorded from Iceland by Morch, 

 but the specimens in his collection belong to Plagiothecium pulchellam. 



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



