218 HANDBOOK OF BRITISH MOSSES. 



cate, eight ; cilia imperfect or fugacious. — Hook. &; 



t. xxi. ; Eng. Bot. t. 1239. ; (Plate 20, fig. 1) ; Moug. ty Nest. 



n. 721. 



On trunks of trees. Bearing fruit, but rarely, in May. 



Less densely tufted than the last. Leaves narrower ; leaf- 

 cells smaller ; fruitstalk longer ; inner peristome often want- 

 ing. Male plants often mixed with the female. Leaf-cells 

 above quadrato-punctiform, arranged in lines, more elongated 

 and hyaline below. 



2. Peristome none. 



3. Z. viridissimus, Brid. ; dioicous ; more or less pulvi- 

 nate; leaves spreading, recurved, subsquarrose, oblongo-lanceo- 

 late ; sporangium obovate, costate when dry ; lid with a long 

 oblique beak. — Hook, ty Wils. t. vi. ; Eng. Bot. t. 1583. ; 

 (Plate 20, fig. 2) ; Moug. §■ Nest. n. 1017. 



On trunks of trees or calcareous rock. Bearing fruit, but 

 rarely, in spring. 



Forming yellow-green tufts with fastigiate branches, or 

 dense cushions. Leaves keeled, a little twisted, slightly 

 curled when dry; leaf-cells very small, punctate; sporangium 

 with eight obscure striae; male plants growing in distinct 

 tufts. 



4. Z. Mougeotii, Br. 8f Schimp. ; dioicous ; tufted ; leaves 

 spreading, recurved, slightly twisted when dry, lineari-lanceo- 

 late ; margin reflexed below ; nerve reaching to the tip ; 

 fruitstalk short; sporangium turbinate, urceolate when dry, 

 striated ; lid rostrate. — Hook. 8f Wils. t. xlvi. ; (Moug. §■ Nest. 

 n. 1016.) 



On moist, shady rocks. Bearing fruit, but rarely, in 

 summer. 



Forming soft, swelling tufts. Leaves elongated, not so 



