428 A. HESSELBO 



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

 Nordredalur!; Brynjudalur (Grl.)!; Reykjavik (Grl.;!); several places 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 especially 

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

 Vestmannaey it grew sometimes in abundance among fallen stones in 

 Heljusdalur, and sometimes on slopes associated with Thu.id.iiim abic- 

 tinum and Hylocomium 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. JUBULE^E. 

 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 compan} 7 

 with Hypnacece, Grimmia spp., Antitrichia curtipendula, etc.; in Rhaco- 

 mitriam heaths (both R. cancscens and R. hypnoides); on slopes among 

 Hylocomium spp.; on the top of knolls 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 Tayl. 



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

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

 and Lejcaiiea. 



92. Lejeunea cavifolia (Ehrh.) Lindb, 

 Lcjeunea serpyllifolia (Dicks.) Spr. 



"In Islandia" (Morch)!. \V. Iceland: Snsefellsnes!; 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 furcata, Madotheca Cordceana, Amphidium Moiif/eoltii, 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 Iladnla 

 and Frullania fragilifolia. 



