KEY TO THE GENERA AND SPECIES OF BRITISH HKPATICiE 157 



(Leaves vertically appressed, obliquely orbicular, very concave, trigones 

 larjjfe, stems erect ; plant ochraceous, or more rarely green. (See 

 Nardia conipressa.) Jamesoniella Carringtoni 

 Leaves without these characters combined ....85 



gg I Perianth absent 36 



( Peria u th present 37 



og j Cladocarpous ; leaves entire Saccogyna viticidosa 



(Acrocarpous; leaves lobed Acrobolbus Wilsoni 



,^rj f Calyptra partly adherent to perianth Harpantlms 



[ Calyptra free 38 



ygjBranches all postical Cephalozia 



(Branches mostly lateral 39 



j'Cladocarpous ; calyptra large, fleshy, usu. longer than the small 



39 j perianth Chiloscyphus 



(Acrocarpous ; calyptra never longer than the perianth 40 



/"Leaves concave, bilobed, whitish; stips. large, ovate-lanceolate 



"^Oj ^ Pleuroclada 

 (Stips. if present not large and ovate-lanceolate 41 



^^ (Per. m. or 1. adherent to the bracts 42 



(Perianth free 43 



^2 (Per. adherent almost throughout Nardia 



(Upper half or more of per. free Eucalyx 



('Leaves patent, elongate-ovate, shortly bilobed, margins incurved 



'IS j Anastrophylliim Donianum 

 (Leaves not elongate-ovate and bilobed 44 



^^ jPer. cylmdrical, depressed at apex Lioclilcena lanceolata 



(Per. not depressed at apex 45 



.f, ( Per. laterally compressed, bilabiate 46 



1 Per. not bilabiate Jungermania 



. g j Per. contracted at mouth Mylia 



(Per. not contracted at mouth 47 



j'Rhizomatous caudex present; stems very rarely radiculose 



^rjj Play lock ila 



No rhizomatous caudex ; stems creeping, rudiculosc... Pedinoj^hyUuvi 



[ ■:- inter riijjtwm 



[Frond with radiating lamellae on upper surface Petalophylhun 



48 j Balfsii 



(Frond without such lamelke 49 



/Several pyriform involucres close together on upper surface of frond 

 49- Spluerocarpus terrestris 



(Without pyriform involucres on frond 50 



[Frond m. or 1. linear, with a globose dark purple involucre below the 

 oOJ apex Targionia hypophylla 



(No globose involucre below apex 51 



g-| (Capsules immersed in the frond Riccia 



(Capsules not immersed in the frond 52 



52 



Capsules hnear, bivalved AntJioceros 



Capsules globose 53 



[Capsule solitary on a lougish pedicel; frond without pores 54 



53 j Several capsules on the under side of a stalked receptacle ; frond with 



( pores (exc. Dwmortiera) 59 



g i j Plant having a perianth 55 



(Plant without a perianth 56 



