PLEUBOZIA. 91 



Pleurozia cochleariformis ( Weiss), Dim. 



Lichenastrum alpmum purpureum foliis cmriiis cochleariformibus, Dill. Hist. 



muse, p. 479, t. G9, f. 1 (1741). 

 Mnium Jungermania, Linn. Sp. pi. p. 1579 (175;')). 

 Jimgermania cochleariformis, Weiss, PI. Crypt, p. 128 (177U); Sm. Engl. Bot. 



t. 2500 (1813); Hook. Brit. Jung. t. G8 (181G). 

 Jungermania purpiorea, Scop. Fl. Carn. 2, p. 347 (1772). 

 Pleurozia cochleariformis, Dum. Syll. Jung. Eur. p. 38 (1831). 

 Physiotium cochleariforme, Nees, Nat. Eur. Leb. Ill, p. 79 (1838). 

 Pleurozia purpurea, Lindb. Muse. Scand. p. 3 (1879). 



Dioicous, loosely or closely cfespitose, large, pale to dark 

 reddish -brown or purple in colour. Stems creeping or ascending, 

 arcuate, simple or with 1-3 long or short branches, frontally 

 compressed, 15 cells in diameter, cortical, with second and third 

 outer layers of cells smaller, reddish-brown, inner whitish, opaque, 

 walls thick. Leaves incubous, closely imbricate, distichous, 

 convex, bilobed, antical lobe ovato-rotundate, emarginate to about 

 a fourth, segments dentate, inliexed, near antical base furnished 

 with 1-3 teeth, postical lobe about \ smaller, attached to the 

 lower portion of the antical lobe, ovate-parabolic, utriculate, base 

 contracted, decurrent, on the inner side deeply depressed and 

 folded longitudinally. At the base of this furrow is a minute 

 slit with a pendant roundish lip, which is slightly concave ; upon 

 this is appressed a very delicate lid of somewhat similar shape 

 but plane, of very delicate cell structure, hanging from the other 

 side of the slit, both these appendages being suspended within 

 the lobule. Texture of leaf firm, epidermis verruculose, cells 

 small to smallish, roundish-hexagonal, trigones very large, often 

 hyaline, lumen deep red or purple, the lip within the lobule is 

 composed of very delicate cells, thin walls, no trigones, about 

 20 X 30, marginal cells subquadrate, still more delicate, about 

 50 to GO round. No stipules. Androecia catkin-like, minute, 

 solitary, produced from the axil of the antical lobe, subcylindri- 

 cal ; perigonial bracts G-8, closely imbricate, appressed, concave, 

 ovate or oval, bifid or tridentate ; antheridia oval, solitary. 



