PLcell.aph. 3. HOMOTHALAMEiE. 81. Enchyl. 397 
nulated ; apothecia sessile, pitchershape, dark brown ; edge 
slightly swollen ; outside wrinkled-granular. 
Collema turgidum, Achar. Lich. Univ. 634. 
On rocks among mosses. 
5. Enchylium tenax. Tough enchyle . 
Thallus nearly orbicular, tilewise ; lobes rather thick, 
flat, lying down, nearly round, deeply cut and crenate ; 
apothecia scattered, immersed in the lobes, concave, reddish, 
edge scarcely cut. 
Lichen tenax, Swartz in N. Act. Ups. 4, 249. 
Parmelia tenax, Achar. Meth. Lich. 231. 
Collema tenax? Hoffm. FI. Germ. 105. 
Collema tenax, Achar. Lich. Univ. 635. 
Among mosses on rocks, adhering strongly to them. 
6. Enchylium plicatile. Folding e chyle. 
Thallus round, tilewise; lobes thick, roundish, pleated in 
circles, wavey, rather upright, not cut ; apothecia scattered, 
sessile, hollow, colour of the thallus, edge not cut. 
Lichen pi icat is, Achar. in N. Act. Stoch. 16, 11. 
Parmelia plicatilis, Achar. Meth. Lich. 240. 
Collema plicatile, Achar. Lich. Univ. 655. 
On rocks. 
7. Enchylium Jluviale . Fiver enchyle . 
Thallus slightly cushion-like; lobes thick, crowded, blunt, 
complicately wavey, deeply cut; apothecia near the edge, 
slightly globular, colour of the thallus, centre pitchershape; 
edge nearly double. 
Lichenoides gelatinosum opuntoides, Dilten in Raii Syn. 72, 58. 
Lichen fluviatilis, Huds. FI. Angl. 536. 
Parmelia fluviatilis, Achar. Meth. Lich. 249. 
Collema fluviale, Achar. Lichen. Univ. 636. 
On stones under water in rivulets. 
8. Enchylium marginale . Marginal enchyle. 
Thallus orbicular, rather stellate, tiledlike; lobes deeply 
jagged, narrow, many-cut, winding, rather flat, crenate; 
apothecia marginal and scattered, blackish-brown, edge not 
in the least cut. 
Lichenoides gelatinosum fuscum, jacobaeae maritimae divisura, Dillen . 
Muse. 140. 
Lichen marginalis, Huds. FI. Angl. 534 ; Engl. Bot. 1924. 
Parmelia melsena marginalis, Achar. Meth. Lich. 241. 
Collema laciniatum, Hoffm. FI. Germ. 100. 
Collema melaenum marginale, Achar. Lich. Univ. 637. 
On limestone rocks, occasionally overflowed. 
