THE BRYOPHYTA OF ICELAND 513 



and is formed by prosenchymatous cells O 00<S— 0.009 iiiiu. broad and 

 3—4 times, at the apex aboul (1 times, as lon<^, which are, as a rule, 

 quite smootli, more rarely slightly papillose towards the leaf-apex. The 

 leaf-margin in L. Breidleri is revolute for ahiiost its entire length, so 

 that only the apex itself is phine. In L. /ilamentosa the leaf-margin is 

 sometimes plane, somctimes more or less revolute. and on the same 

 plant leaves may be found witli margins either quite plane or revolute 

 to the apex, which ctTaccs the ditl'erence between the type and the 

 variety brachyclados (Schwågr.) Br. eur. This form, which occurs rather 

 frequently in somewhat damp habitats, forms in several respects a 

 transition to L. Breidleri, and has, as the latter, a well-develojied central 

 strand, while the usual forms of L. /ilamenlosa never have a central 

 strand. 



228. Lescuræa patens Lindb. 

 Psendoleskea palens Lindb.; Limpr. 



E. Iceland: Berutjordur !, ?, 500—600 metres above sea-level. N. 

 Iceland: Grimsey > O. D. ! fr ). XW.Iceland: Gnupsdalur near Dyrafjordur! 

 fr.; D,\njandi! ^. W. Iceland: Reykjavik!; Kollafjordur! J* ; Modruvellir!, 

 in several piaces up to a height of about 200 metres, (^. S. Iceland: 

 Barkarstadr, about 460 metres above sea-level. 



Lescuræa palens appears to be rather widely distributed in all parts 

 of Iceland. It is met with from the low land to high up in the Alpine 

 region on somewhat damp, shady rocks or damp stony slopes, often 

 very abundantly. Thus, in Gnupsdalur it occurred in masses on stony 

 slopes from about 250—400 metres, in association with L. /Ilamentosa, 

 L. Breidleri, Pohlia commutata, Brachythecium reflexam and Lophozia spp. ; 

 and with numerous fruit which had just ripened on June 19th. Near 

 Reykjavik it grew on the ground among large stones in a damp meadow, 

 in Company with Schistidiani yracile. 



Note. P/yc/2od/«77j p//co/zz/2j [ Schleich.) Schimp. is recorded by GrSn- 

 lund from Grimstunga and Reykjavik. The plant from Grimstunga is 

 only a form of Brachylheciam albicans, and that from Reykjavik of 

 Camptolhecium lulescens. 



229. Heterocladium squarrosulum (Voit) Lindb. 

 Heterocladium dimorpham (Brid.) Br. eur. 



E. Iceland: Berufjordur!; Hof!. N. Iceland; Myvatn (Grl.)!; Ljosa- 

 vatn!; Hof near Eyjafjordur (O. D.)!. SW. Iceland: Thingvallahraun!; 

 KoUafjordur !. S. Iceland : Kihlhraun!. 



Occurred here and there on dry ground, especially on moss-covered 

 slopes or in birch coppices. Near Hof in E. Iceland it grew on a stony 

 slope (about 100 metres above sea-level) covered with Hylocomium spp. 

 and Rhacomilrinm. In Thingvallahraun it was found associated with 

 Hypnum uncinalum, Pohlia nnlans and P. acnminata on a small slope 

 in the birch coppice. Only sterile specimens have been found. 



