HANDBOOK Ol' BRITISH HEPATICi«. 247 



branched dichotomously, of a delicate translucent 

 green, the stem broad and purple, clothed with 

 radicles of the same colour. The leaves are a line 

 or more broad, obtusely lobed, horizontal ; calyx 

 campanulate, crenate" (fig. i6g).—Carnngion. 



Although Dr. Carrington describes the spores as 

 " covered with short spines," M. Corbiere has shown 

 that the surface of the spore is alveolate, with deep 

 hexagonal pits, 35-38/x did^m.^i Revue BryoL, iSgo, 

 p. 2) 



Genus 35. PETALOPHYLLUM, Gottsche. 



Involucre connate with the colesule. Peri- 

 anth quadrate-campanulate, mouth funnel- 

 shaped, undulate, toothed. Capsule coriaceous, 

 one-valved, split to the middle into four 

 irregular segments, pitted, lobed at the apex. 

 Elaters vague, geminate, deciduous. — Codoiiia 

 Dumort. Comm. Bot. p. 1 1 1 (1822). 



' Petalophyllum Ralfsii, Gottsche. 



Fronds procumbent, the midrib prominent 

 beneath, overlapping each other in a singular 

 lamellate manner (figs. 166, 167). Fruit 

 borne from the upper surface. Calyx lunnel- 

 shaped, broad and toothed. Calyptra shorter. 

 Capsule spherical, bursting irregularly. Spores 

 reticulated. 



Jungcrmannia Iiibernica, var. Wils. Kng. 



