430 A. HESSELBO 



II. SPHAGNALES. 



1. Sphagnum imbricatum (Hornsch.) Russow. 



S. Austim Sull. 



S. Iceland: Thorlakshver and Laugarashver near Skalholt!. It grew 

 there on the warm substratum along the outlets from the hot springs 

 in immense yellowish-brown cushions as much as 25 cm. deep. 



2. Sphagnum cymbifolium (Ehrh.) Hedw. 



W. Iceland: near several hot springs in Reykholtdalur!. S. Iceland: 

 Thorlakshver!; sydri Reykjahver!; Laugarvatnshver ! ; Hurdarbak (H. J. !). 



In all the above localities it grows on damp ground around hot 

 springs. 



3. Sphagnum medium Limpr. 



NW. Iceland: Baeir!; Armuli!. S. Iceland: Common in the district 

 around Skalholt!. W. Iceland: Reykjavik! 



The plant grows everywhere in wet bogs. 



4. Sphagnum papillosum Lindb. 



\V. Iceland: Reykjavik!, common on boggy ground; Reykholtdalur 

 (Grl.;!), around numerous hot springs. S. Iceland: Hraun; Grimstadr 

 (H. J.)!; Hraundalshraun (H. J.)!; Sydri Reykjahver!. 



In Reykholtdalur Sphagnum papillosum constitutes the bulk of the 

 vegetation around the hot springs and, for instance at Deildatunguhver, 

 covers large areas of the warm, damp ground with cushions as much 

 as about 20 cm. deep. It appears to be rather widely distributed in 

 S. Iceland and is found there, as near Reykjavik, on the knolls in the 

 bogs, sometimes on a rather dry substratum. 



5. Sphagnum inundatum Russow. 



W. Iceland: Grundarfjordur (H. J.!). S. Iceland: Thorlakshver!; Sydri 

 Reykjahver!. 



In the two latter localities it grew along the outlets from the hot 

 springs, near S3 7 dri Reykjahver it grew also on the knolls in a small 

 bog near the spring. 



