THE BRYOPHYTA OF ICELAND 429 



Besides in the tuff districts, it is also rather frequent in the lava- 

 lields where it grows at the bottom of deep, damp clefts, but as a rule 

 only in small quantities. Sterile specimens only have been found. 



FAM. ANTHOCEROTACE.E. 

 93. Anthoceros punctatus L. 



W. Iceland: Reykholtdalur (Ho.; Grl.;!). S.Iceland: Reykirdalur!; 

 Sydri Reykjahver!. This species was first collected by Koenig and 

 figured in Flora Danica, tab. 396. 



It occurs near the majority of the hot springs in Reykirdalur. It 



grows there abundantly on damp clay-flats with a temperature of 20 



-30, associated with Fossombronia, Haplozia creiialata and Archidium, 



especially on slopes immediately above the hot water. It almost always 



bears numerous capsules. 



