HANDBOOK OF BRITISH HEPATIC^E. 47 



ventricose ; stipules obcordate, plane ; peri- 

 anth compressed. 



Jungermannia Mackaii, Hook. Br. Jung, 

 t. 53 ; Eng. Bot. t. 2573. Phragmicoma 

 Mackaii, Dumort. Comm. p. 112 ; Gott. and 

 Rabh. Exs. 81, 164, 206 ; Cooke Hep. fig. 

 147, 148 ; Carr. and Pears. Exs. No. 133, 134. 

 Homalo-Lejeunia Mackaii, Spr. Hep. Amaz. 

 p. 134. 



On rocks, sometimes on trees. (Fr. Winter.) 



Growing in dense blackish green patches, from 

 i to 2 inches to many feet in diameter. Stems creep- 

 ing over each other in succes- 

 sive layers. Each to i 

 inch long, slender, thread-like, 

 flexuous, once or twice, 

 branched irregularly; branches 

 variable in length, leaves rather 

 closely imbricated in two rows, 

 over the whole upper surface 

 of the stem (fig. 33), horizontal, 

 divided into two unequal lobes, 

 roundish, slightly convex, the 

 lesser one scarcely one-tenth 

 of the size, involute and ventri- 

 cose. When dry the whole 

 surface "seems to be punctate, colour olive green, 

 approaching black. Perichaetial leaves resembling 

 the cauline, but larger, with a lobule half the size 

 of the lobe, adpressed to the calyx. Stipules large, 



