46 HANDBOOK OF BRITISH HEPATIOE. 



antical lobe very convex, abruptly erect from 

 a basilar sac ; stipules spreading, with a broad 

 obtuse sinus to the middle, roundish, convex ; 

 perianth five-plicate above. 



Lejeunia patens, Lindb. Irish Hepat., 1875, 

 p. 483 ; Carr. and Pears. Exs. No. 284. Le- 

 jeunia serpyllifolia, var. ovata, Nees. Hep. p. 

 294. 



Autoicous, shorter, and twice narrower, pallid, 

 pellucid, shining when dry, very often more branched 

 and intricate, convex or subterete ; leaves more or 

 less dense ; antical lobe very convex, incubous, 

 when dry straight, abruptly erect from a basilar sac, 

 very decurrent, oblique, broadly ovate-elliptic or 

 oval, very obtuse, cellules rather prominent, crenu- 

 late, basilar sac two to four times less. Stipules 

 spreading, two to four times less than the postical 

 lobe, very convex, roundish, split to the middle, 

 sinus more or less broad and obtuse, segments 

 rather obtuse, margins everywhere crenulate with 

 the prominent cells. Perianth on lateral branches, 

 a little emergent, clavate pear-shaped, terete below, 

 above five-plicate one-fourth way down, crests 

 higher, complanate, the edge crenulate. (Plate /, 

 fig- a-) 



Lejeunia Mackaii, Hook., Dum. 



Stems creeping, vaguely branched ; curved ; 

 leaves distichous, two-lobed ; auricles involute, 



