164 HANDBOOK OF BRITISH HEPATIC/E. 



ovately wedge-shaped, spreading, divergent, 

 subreflexed, plane, bifid, laciniae rather diver- 

 gent, acute. 



Jungermannia exigua, Tayl. Trans. Bot. 

 Soc. Edin. I., 179. Plagiochila exigua, Dum. 

 Hep. Eur. 46 ; Carr. and Pears. Exs. No. 

 15 ; Carr. Br. Hep., p. 65, t. iv., fig. 13. 



On trunks, parasitic on other hepatics. 



Forming minute scattered, or dense tufts. About 

 \ inch high, light green, usually caespitose, but 

 when growing amongst other species decumbent ; 

 shoots minute, naked at the base. Leaves 

 distant, alternate, erect, then spreading, from 

 a narrow base, wedge-shaped or obovate, bidentate 

 at the apex, with an acute shallow sinus, lobes acute, 

 divergent. Amphigastria generally present, minute, 

 subulate, toothed on one side, or acutely bidentate. 

 Taylor says it is closely allied to P. bidenticulata. 

 from which it may be recognised by its smaller size, 

 the shallower division of the leaves, their less acu- 

 minated segments, by their being shorter, by their 

 far smaller cells, by the weak connexion of the 

 leaves to the stems, by the paler colour of the adult 

 plants, more spreading leaves, and by the roots 

 occupying a greater length of stem. (Plate 4, 

 fig. #&> 



GENUS 24. APLOZIA, Dumort. 



Involucre two or three leaved ; perichaetial 

 leaves undivided, entire, conforming to the 

 stem leaves. Perianth sessile, erect, teicte, 



