406 A. HESSELBO 



older lists, and Gronlunds records it from many localities in Iceland, 

 but all the specimens found in the collections under this name are 

 those of Pelliu Xeesiana. 



15. Blasia pusilla L. 



N. Iceland: Reykum (Grl.)!; Melar (Grl.)!; several places near Modru- 

 vellir near Eyjafjordur O. D.) ! ; Reykjalaug in Fnjoskadalur (O. D.)!; 

 Oxnadalur!; Stadr near Hrutafjordur!. W.Iceland: Gilsbakki!; common 

 in Reykholtdalur!. S. Iceland: Reykirdalur!. 



Only the $ plant has been found in Iceland. 



This species occurs in rock-clefts and along the banks of streams, 

 on wet gravelly ground, and also on clay near hot springs. For instance, 

 it grows abundantly in Reykholtdalur, and more scantily in Reykir- 

 dalur on the damp, steaming clayey flats, the temperature of which 

 just below the surface is about 25 J -40; it is found associated with 

 Gymnocolea inflata, Haplozia crcmilata and Fossombronia Dnmoiiieri. 



On banks of streams it usually grows rather scantily and associated 

 with Dicranella crispa, Pellia Xeesiana, Didijmodon rnbellns, Angstromia 

 longipes, Scapania subalpina, etc. 



Note. Morchia Biyltii (Morch) Brockm. is recorded by Gronlund 

 to occur in Brynjudalur, but the specimens preserved in the Botanical 

 Museum in Copenhagen belong to Blasia pusilla. 



FAM. CODONIE.E. 



16. Fossombronia Dumortieri (Hub. et Genth) Lindb. 



N. Iceland: near Mvvatn!. S. Iceland: near hot springs on Rej'- 

 kjanes (Ostf. ! ; Reykir!: Thorlakshver!; Laugarashver!; Sydri Reykjahver!; 

 Thingvellir!; Kolvidarhol!; Geysir Ho.;!). W. Iceland: common near 

 hot springs in Reykholtdalur!. 



Fossombronia Dumortieri is one of those species which are rarely 

 absent from the neighbourhood of any hot springs if only the water 

 does not contain too much sulphuretted hydrogen. There it grows on 

 warm clayey flats with a temperature of about 40, and especially on 

 damp slopes along the outlets of springs; as a rule it sets fruit which 

 ripens during June July. 



In Reykholtdalur it is common near all the hot springs, also near 

 the springs on Riskupstungur, near Geysir and on Reykjanes. In Reykir- 

 dalur, where the majority of the springs give out abundance of sul- 

 phuretted hydrogen in their vapours it occurred less frequently, but 

 nevertheless was found near several springs, also around some small 

 fumaroles near Kolvidarhol from which issued aqueous vapours im- 

 pregnated with sulphuretted hydrogen. It grows in all these localities 

 associated with other Hepatica?, for instance Gymnocolea inflata, Haplozia 

 crcmilata and Anlhoccros punctatiis. Near Mvvatn it was growing around 

 a fumarole, on a damp clayey flat with a temperature of about 40, 

 associated with Kicciu bifurca and Haplozia crenulala. The only place 



