446 A. HESSELBO 



are irregular in form more or less far down the leaf, sometimes far 

 below the middle, sometimes only at the leaf-apex itself; slightly or 

 hardly porose, occasionally strongly porose in the lower half of the 

 leaf, more rarely to near the apex, in the last case the walls are strongly 

 incrassate. 



Dicranum brcvifolium Lindb. is recorded from Vatnsdalsfjall (Grl., 

 Tillseg til Islands Kryptogamflora, Bot. Tids., 20), but the plant from the 

 latter locality is only a form of D. congestum in which the irregularly 

 shaped cells are strongly incrassate and extend down below the middle 

 of the leaf. Such forms, which, as a rule, are also distinguished by very 

 strong nerves, have been found in several localities, for instance near 

 Berufjordur and about Eyjafjordur. The true D. breuifoliiim, which is dis- 

 tinguished by its shorter leaves, crisped when dry, and its thin-walled 

 cells, which are in a great measure quadrate and in rows, has not 

 been found in Iceland. 



33. Dicranum spadiceum Zett. 



W. Iceland: Hvitidalur (H. J.)!. E. Iceland: Hornafjordur!; Seydis- 

 fjordur!. N. Iceland: Hof (O. D.)!; Vatnsdalsfjall (St.)!. 



Grows on a damp substratum, especially on knolls in bogs. Only 

 sterile specimens have been found. 



34. Dicranum elongatum Schleich. 



"In Islandia" Morch ! (fr.). N. Iceland: By Hrutafjordur!. NW. Iceland: 

 Dynjandi!; Hesteyri!. W. Iceland: Stykkisholmur !. This species is also 

 recorded from some localities by Gronlund, but the specimens in 

 the collections are wrongly determined, being D. Starckei, and others. 



D. elongatum grows everywhere on wet, boggy ground. By Hruta- 

 fjordur it w 7 as common on knolls in bogs along the eastern side of 

 the fjord from Stadrbakki to Stadr, and it was also frequent in bogs 

 near Stykkisholmur. 



All the specimens collected were quite typical. The nerve was 

 about */4 the width of the leaf at its base. With the exception of the 

 specimen found by Morch only sterile specimens have been collected. 



Note. According to Gliemann, Dicranum montanum was found 

 in Iceland by Morch, but no specimens of it are to be found in the 

 collections, and the record of this species is undoubtedly due to an er- 

 roneous determination. 



35. Campylopus Schimperi Milde. 



N. Iceland: Geitaskard!. E. Iceland: Hornafjordur!; Lon!; Beru- 

 fjordur!. W. Iceland: Reykjavik!; Esja (Grl.)!. S. Iceland: Breidabolstadr!. 



Commonly distributed in South-western and South-eastern Iceland 

 on damp ground in bogs, where it forms compact cushions, 23 cm. 

 deep. It has only been found in the low land. 



