HANDBOOK OF BRITISH HEPATIC^E. 51 



shaped, naked ; elaters two-spired, deciduous. 

 Dumort. Rev. Jung., 14. 



Radula is apparently separated by a wide inter- 

 val from every other genus. It has one unique 

 character, viz., the attachment of the radicles to the 

 under lobe of the side leaves, and not to the 

 under leaves, or the underside of the stem, as 

 in all other hepatics. In the branches springing 

 from the outer base of the leaves it agrees with 

 Lejeunea, and with no other. In its most essential 

 features it differs altogether from Lejeunea; e.g., 

 in the polygynous female flowers, the macrosto- 

 mous perianth, the stout pedicel, composed of six 

 to eight concentric layers of alternate cells, and 

 above all in the very numerous long slender 

 two-spired deciduous elaters. Spruce. 



Radula complanata, Z., Dum. 



Stem creeping, flattened, branched, some- 

 what pinnate ; leaves auriculate behind, plane, 

 rounded, entire; auricle four times shorter, 

 adpressed, angle rounded. Perianth flattened, 

 mouth entire. 



Jungermannia complanata, Linn. Sp. 1599; 

 Hook. Br. Jung. t. 81 ; Eng. Bot. t. 2499. 

 Radula complanata, Dumort. p. 112; Gott. and 

 Rab. Exs. 17, 361 ; Carr. and Pears. Exs. No. 

 129, 130; Cooke Hep. f. 137, 138. 



On trunks. (Fr. April, May.) 



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