152 HANDBOOK OF BRITISH MOSSES. 



rather obtuse, minutely toothed at the apex ; margin rather 

 waved; nerve reaching nearly to the tip; leaf-cells minute, 

 elliptic, opaque; fruitstalk above \ an inch long, yellowish; 

 sporangium subcylindrical, erect; lid narrow, conical, acute; 

 inner peristome very brittle ; spores small, brown. 



2. A. longifolius, Hartm. ; branches slender, elongated ; 

 branchlets fasciculate; leaves subsecund, ovato-lanceolate, 

 acuminate ; nerve reaching to the tip ; fruitstalk short ; spo- 

 rangium erect, oblong; lid conical, acute. Hook, fy Wils. 

 t. liv. ; (Moug. Nest. n. 1230.) 



On rocks. Scotland. Rare. Bearing fruit on the Continent 

 in autumn and spring. 



Dioicous; tufted, verdigris-green, when young yellowish, 

 when old reddish below. Branches or secondary stems erect, 

 slender, elongated with fasciculate often flagelliform branches; 

 leaves subsecund, ovato-lanceolate, strongly acuminate, sulcate 

 at the base; nerve reaching to the tip; leaf-cells roundish, 

 minute; fruitstalk not J an inch long; sporangium oblong, 

 subcylindrical ; lid narrow, conical or rostellate. 



A much more delicate species than the last, and resembling 

 Pseudoleskea catenulata and atrovirens. 



28. PTEROGONIUM, Swartz. 



Sporangium symmetrical ; peristome double ; outer of six- 

 teen teeth; inner of a short membrane, divided above into 

 sixteen teeth, and more or less adherent to the outer; 

 secondary stems dendroid ; leaves even, not papillose ; leaf- 

 cells minute, subelliptic, longer in the disk towards the 

 base. 



1. P. gracile, Sw. ; secondary stems arcuate; branches in- 

 curved, fasciculate ; leaves imbricated, ovate, acute, two-nerved, 

 serrated above; sporangium oblong; lid conical, acute. 



