6 SYNOPSIS OP BRITISH MOSSES. 



smooth, cells oblong and elongate, thinly chloro- 

 phyllose, oblong hexagonal towards apex, lax, rect- 

 angular at base. Caps, generally cernuous, sometimes 

 striate. Perist. t. large, regular, solid, bifid, densely 

 articulate below, with filiform crura, minutely granu- 

 lose. Spores medium smooth. Dioicous, rarely 

 monoicous. 



17. Dioranum, Hedw. PI. taller and more showy, 

 tomentose. L. generally patent or falcato-secund, 

 smooth, rarely papillose, shining or opaque, nerve 

 sometimes excurrent, elongate-lanceolate or lanceolate- 

 subulate, apical cells lineal-oblong, basal elongate, 

 generally very narrow, quadrate at angles, sometimes 

 inflated ; per. 1. more or less sheathing. Caps, erect 

 or cernuous, rarely striate, with a spurious neck, 

 sometimes strumose, lid generally subulirostrate. 

 Perist. t. bifurcate, interruptedly trabeculate. Spores 

 small. Monoicous or dioicous. 



18. Dicranodontium, B. and 8. Densely csespitose, 

 radiculose. L. erecto-patent or falcato-secund, seta- 

 ceous, nerved, shining, fragile, areolation lax, excavate, 

 reddish at angles. Caps, on an upright arcuate seta,, 

 oblong or elongate-cylindric, without striae, annulus 

 absent, lid convexo-conical, acidulate. Calyptra cu- 

 cullate, base entire. Perist. t. 16, long, unequally bi- 

 partite to base, crura lanceolate-filiform. Dioicous. 



19. Campylopus, Brid. L. broadly nerved, nerve 

 often sulcate at back, basal cells uniformly rectangular, 

 generally dilated excavate at angles. Caps, oval, 

 regular, generally striate on an arcuate seta, lid subuli- 

 rostrate. Calyptra cucuUate, fringed at base. Annu- 

 lus of 1, 2, 3 rows of cells. Perist. as in Dicranum. 

 Dioicous. 



