THE BRYOPHYTA OF ICELAND 513 



and is formed by prosenchymatous cells 00080.009 mm. broad and 

 34 times, at the apex about 6 times, as long, which are, as a rule, 

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

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

 that only the apex itself is plane. In L. filamentosa the leaf-margin is 

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

 plant leaves may be found with margins either quite plane or revolule 

 to the apex, which effaces the difference between the type and the 

 variety brachyclados (Schwagr.) 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-developed central 

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

 strand. 



228. Lescuraea patens Lindb. 

 Pseudoleskea patens (Lindb.) Limpr. 



E. Iceland: Berufjordur!, $, 500600 metres above sea-level. 

 Iceland: Grimsey l^O.D.)! (fr.). NW. Iceland: Gnupsdalur near Dyrafjordur! 

 fr.; DVnjandi! tf. W. Iceland: Reykjavik!; Kollafjordur! $ Modruvellir!, 

 in several places up to a height of about 200 metres, J*. S. Iceland: 

 Barkarstadr, about 460 metres above sea-level. 



Lescnrcect patens 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 250400 metres, in association with L. filamentosa, 

 L. Breidleri, Pohlia commulata, Brachytheciiim re/lexum 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 Schistidium gracile. 



Note. Ptychodium plicatnm (Schleich.) Schimp. is recorded by Gr5 n- 

 lund from Grimstunga and Reykjavik. The plant from Grimstunga is 

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

 Camptothecmm tutescens. 



229. Heterocladium squarrosulum (Voit) Lindb. 

 Heterocladium dimorphnm (Brid.) Br. eur. 



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

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

 Kollafjordur!. 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 Rhacomitrinm. In Thingvallahraun it was found associated with 

 Hypnum uncinatum, Pohlia nntans and P. aciuninata on a small slope 

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



