428 A. HESSELBO 



Dynjandil; Grunnavik! at an altitude of about 270 metres. W. Iceland: 

 Nordredalur!; Brynjudalur (Grl.)!; Reykjavik (Grl.;!); several piaces in 

 Esja!. Common in S. Iceland!. Vestmannaey ! 



This plant is most widely distributed in S. Iceland where, as on 

 Vestmannaey, it is common on more or less damp rock-sides especialh^ 

 in clefts of the tufl" mountains on Fljotshlid and below Eyjafjall. On 

 Vestmannaey it grew sometimes in abundance among fallen stones in 

 Heljusdalur, and sometimes on slopes associated with Thuidiiim abic- 

 tinum and Hylocomiiim spp. In E. and NW. Iceland it was rarer and 

 generally occurred only sparingly on faces of basalt rocks immediately 

 above the surface of the water of rivers or on damp slopes among 

 stones. This species has not yet been recorded from N. Iceland. 



Fam. JUBULEÆ. 



89. Frullania dilatata Nees. 



W. Iceland : Flatey, on mountain ash (name of finder not stated); 

 Dalasysla, Melar, on sea-fowl cliffs (H. J.)!. Only sterile specimens have 

 been found. 



90. Frullania Tamarisci Nees. 



Common both on dry and on somewhat damp rocks in company 

 with Hypnaceæ, GrUnmUi spp., Anlitrichia ciirtipcndula, etc; in Rhaco- 

 mitriiim heaths (both R. cancscens and R. hypnoidcs)., on slopes among 

 Hylocomiiim spp.; on the top of knolis in marshes, etc. 



I do not think the plant occurs at a much higher altitude than 

 about 300 metres and it is always sterile. 



91. Frullania fragilifolia Tavl. 



SW. Iceland: Hafnarfjordur, in a lava cave (Grl.)!; Kolvidarhol!; on 

 a rock-face at an altitude of about 400 metres associated with Radula 

 and Lejciinea. 



92. Lejeunea cavifolia (Ehrh.) Lindb. 



Lejeiinca serpyllifolia (Dicks.) Spr. 



"In Islandia" (Morch)!. W. Iceland: Snæfellsnes!; Sandur in a lava 

 cave (H. J.)!; Hafnarfjordur in lava caves!; Kolvidarhol!. S. Iceland: 

 Seljaland (Stp.)!; common on Fljotshlid and below Eyjafjall!: Thingvalla- 

 hraun !. 



This plant is common in S. Iceland where it grows especially on 

 shady rock-sides in the clefts and caves of tuff mountains, associated 

 with Metzgeria farcata, Madotheca Cordceana, Amphidiiim Moiigeottii, etc. 

 The habitat of greatest altitude is near Kolvidarhol at about 400 metres 

 above sea-level , there it grew on a rock-face associated with Radula 

 and Frullania fragilifolia. 



