DICRANEI. 275 



1. C. purpureus, Brid.; csespitose, dichotoraous; leaves 

 elongate-lanceolate, keeled; margin entire, reflexed ; nerve 

 slightly excurreut ; sporangium oblong or oval, erect or sub- 

 cernuous, with a short neck, furrowed when dry ; lid conical ; 

 teeth united below by a basal membrane, bordered with a pale 

 margin. Hook. % Wils. t. xx. ; Eng. Bot. t. 2262, 2294, 2533.; 

 (Plate 23, fig. 5) ; Moug. % Nest. n. 24. 



On banks, pastures, etc., common. Bearing fruit in spring. 



Dioicous ; forming extensive dull-green patches. Stems vary- 

 ing in length, sometimes very short ; fruitstalk red ; lid conical, 

 acute; teeth when dry spirally incurved. Found in most 

 parts of the world. Leaf- cells distinct, quadrate, or subrotund 

 above, about twice as long, and rectangular at the base ; nerve 

 strong. 



92. TRICHODON, Schimp. 



Fruitstalk long, flexuous ; veil cucullate ; sporangium erect, 

 cylindrical, without striae ; ring broad ; peristome of sixteen 

 teeth split to the base, the divisions nearly equal, nodose, in- 

 curved, or hamate when dry ; leaf-cells rectangular. 



1. T. cylindricus, Br. fy Schimp. Hook. Wils. t. xxxix. 



On sandy banks. Ireland ; north of England and Essex. 

 Bearing fruit in spring. 



Forming pale yellow-green patches. Stems \-\ inch high ; 

 leaves delicate, flexuous, squamose, subulate, from a sheathing 

 base; nerve excurrent, predominant; leaf-cells rectangular, 

 narrower below ; sporangium quite even when dry ; lid co- 

 nical. 



Very different in habit from Ceratodon purpureus, and very 

 properly separated by Schimper. 



93. LEUCOBRYUM, Hampe. 



Veil cucullate ; sporangium striate, furrowed when dry, 



T 2 



