THE BRYOPHYTA OF ICELAND 



507 



ilexuoso-linearibus, apicalibus brevioribus, angulorum multo majoribus, 

 rectangulis. Folia ramulorum angustiora. Flores et fructus ignoti.'' 



This species, which was first found by Feddersen in the Helga 

 in S. Iceland, grew very abundantly on stones in the Reykirdalsa in SW. 

 Iceland. This river has copious influx from the hot springs, so that, in 

 the first days of June, the temperature of the water was about 12, 

 which was essentially higher than in the majority of the other rivers 

 where the temperature was, as a rule, only about 4 -6. 



Fig. 12. Fontinalis longi folia C.Jens. (Reykir: somewhat reduced). 



Fontinalis longi folia agrees most closely with F. hypnoides R. Hartm. 

 The plant from the Reykirdalsa is rather robust, as much as 25 cm. 

 long, very strongly and irregularly branched, with rhizoid-cushions around 

 all the points whence the branches issue, and with plane or somewhat 

 concave, longly tapering, very soft leaves, which only exceptionally are 

 folded along the median line. The J plant is more slender than is 

 the $ plant, with very numerous, narrowly ovate <^ flowers, which often 

 occur in clusters of 2 4 on the main axis and branches and contain 

 each 24 antheridia. The fruit, which in the beginning of June was 

 developed to almost full size, but was as yet quite green, so that the 

 peristome and spores could not be investigated, was found scantily on 

 the lowermost part of the stem. As in F. hypnoides the capsule was 

 half-exserted. 



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