412 A. HESSELBO 



This plant was first found by Morch and figured in Flora Danica, 

 tab. 2190, without a more precise notification of its habitat. 



Gronlund's record of the occurrence of this species in Esja is 

 due to an erroneous determination. 



35. Sphenolobus saxicola (Schrad.) Steph. 



"in Islandia leg Morch" (M. B. H.)!. Figured in Flora Danica, tab. 

 2693, fig. 1, but no habitat is given. 



36. Sphenolobus politus (Nees) Steph. 



Isafjordur! c. coles. 



It was growing there in several localities at an altitude of about 200 

 -300 metres, sometimes along the banks of streams associated with Har- 

 panthus Flotowianus, sometimes in bogs associated with Sphagnum teres, 

 Lophozia quinquedentata and L. Kunzeana. 



37.Lophozia quinquedentata (Huds.) Cogniaux. 



Very common all over Iceland. 



Lophozia quinquedentata is doubtless the liverwort of most fre- 

 quent occurrence. It is met with, up to the snow-line, in all possible 

 localities which are somewhat damp, now and then in unmixed tufts, 

 but general!} 7 woven into the tufts of mosses. Female plants and fruit 

 are rather rare, male plants are far more frequent; plants bearing 

 gemmae are also often met with. 



It varies extremely as regards size, habit and leaf-form. The extreme 

 members of the variation-series are the large var. turgida Lindb. which 

 is common on boggy ground and t e delicate, often only one mm. 

 broad, var. tenera C. Jens, which is frequent in dry localities, as for in- 

 stance on humus-covered rocks and in lava-fields. 



38. Lophozia lycopodioides (Wallr.) Cogniaux. 



Almost as common as the preceding species on drier ground. It 

 is found especially on stony or grass-covered slopes, creeping over 

 humus-covered rocks, in birch coppices, and on the top of knolls in 

 bogs, sometimes in large, unmixed, yellowish-green tufts, sometimes inter- 

 mixed with other Bryophyta. Only sterile specimens have been found. 

 It varies considerably in size. Delicate forms (var. parvifolia), often 

 only one mm. broad, grow on dry rocks woven into the tufts of other 

 Bryophyta, while the large, vigorous forms are especially met with on 

 slopes overgrown with Hylocomium. Now and then forms also occur 

 which approach very closely to Lophozia Hatscheri (Evans) Steph. But 

 plants which can with certainty be referred to this species have not 

 been found in Iceland. 



Lophozia lycopodioides is most widely distributed in the birch-zone, 

 up to about 400 metres above sea-level, and is especially wide-spread 

 towards the north-west while it occurs more sparingh 7 in S. Iceland. 



