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-Lcjcunia Mackaii, Spr. Hep. Amaz. 



P- 134- 



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



Growing in dense blackish green patches, from 

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

 ing over each other in succes- 

 sive layers. Each \ to \\ 

 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 



iuc 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, 



33- 



