THE BRYOPHYTA OF ICELAND 433 



17. Sphagnum Lindbergii Sch. 

 W. Iceland: Ketilstadr among S. fimbriatum (H. .T.)!. 



18. Sphagnum riparium Angst. 



NW. Iceland: Thoroddstadaengjar (St.)!; common in pools and in 

 very wet parts of bogs near Jokulsfjordur!. 



19. Sphagnum angustifolium C. Jens. 



N. Iceland: Akureyri!. W. Iceland: Reykholtdalur near a number of 

 hot springs!. S. Iceland: Reykirdalur!; Laugaråshver !. 



This species occurs abundantly along outlets from the hot springs 

 in deep cushions of a pale green, yellowish or light brownish-yellow 

 colour. The leaves are distinctly wavy in all the piants from a warm 

 substratum. Its occurrence at Akureyri is peculiar; there it grew at 

 an altitude of about 500—600 metres on wet boggy ground as a slender, 

 pale-green, but otherwise typical, form. Only sterile specimens have 

 been found. 



20. Sphagnum Dusenii C. Jens. 



W. Iceland: Snældubeinstadahver in Reykholtdalur!. 

 In the above locality it grew in large yellowish-brown tufts in 

 warm water of a temperature of 25 °, near a hot spring. 



