THE BHYOPHYTA OF ICELAND 



519 



saturate virides, habitu fere forrase gracilis Brachythecii vchilini. Caulis 

 repens, dense tomentosus, 23 cm. longus, 0.25 mm. crassus, ramos 

 erectos numerosos, 45 mm. longos emittens. Folia caulina non de- 

 currentia e basi late ovata vel triangulo-cordata in cuspidem longissimum 



a /> D n c 



Fig. 15. Brachythecium longipilnm. a, Capsule (X20); /', branch-leaves (X20): 



c, stem-leaves (X 20). 



et tenuissimum recurvatum producta, per totam marginem denticulata^ 

 11.2 mm. longa, 0.40.6 mm. lata, costa brevi et indistincta. Folia 

 ramorum erecto-patentia aut subsecunda, lanceolata, longius acuminata^ 

 1.4 1.6 mm. longa, 0.40.6 mm. lata, per totam marginem denticulata^ 



Fig. 16. Braclu/ Hied inn longipilnm. Leal-base (X175; phot.). 



costa mediam partem folii paulo excedente. Cellulae angusta?, sinuata3 y 

 0.004 mm. latae, 0.060 0.075 mm. longae, basilares in uno vel duo se- 

 riebus, ovales, porosse, pach} T dermia3, 0.010 mm. latse, in angulis quadratse 

 vel ovales, paucae. 



Perichretium e cauli primario egressum. Folia perichsetialia exteriora 

 apice brevi, interiora apice longo reflexo, ecostata vel costa perbrevi et 



