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396 SO.PIacynth. 3. HOMOTHALAME^. PLcell.apL Lichen niger, Hudson Fl. Angl. 524; Engl, Bot. 1161. Lecidea corallinoides, Florke, Berl. Mag. 1809, 5. Lecidea nigra, Achar, Meth. Lich. 76. Stereocaulon corallinoides, Hoffm. FL Germ. 129. Collema nigrum, Achar. Lichen. Uniu. 628. On rocks, espcially limestone. 11. 81.ENCHYL1UM. Acharius. Enchjie. Thallus plaited tilewise, nearly orbicular, composed of minute lobes, when moist turgid, very thick. 1. Enchyllum micropliyllum. Small-leaved enchyle. Thallus slightly spreading, tilewise, blackish green; lobes thick, minute, crowded, deeply crenate; apolhecia sessile, crowded, pitchershape, hollow, colour of the thallus, edge not in the least cut, contracted. Collema microphyllum, Achar. Lich. Univ. 630. On the bark of old trees. 2. EvcJn/lium fras^rnns. Sweet-scented ejichyle. Thallus nearly orbicular ; lobes round, expanded, naked, edge thick, crenate, ascending; apothecia scattered, minute, hollow, dark yellowish brown ; edge swollen outwardly, uneven. Lichen fragrans, Engl, Bot. 19, 12. Trujiks of trees. When moistened has a sweet odour. 3. Enchylium crispum. Crisp enchyle. Thallus nearly orbicular; central lobes rather upright, granular; lobes of the circumference depressed, large, blunt, crenate; apothecia scattered, slightly concave, reddish, edfife granular. Lichenoides gelatinosum atrovirens, crispum et rugosum, 2)27/en iWMSc. 139. Lichen crispus, Engl. Bot. S34. Lichen pulposus ;S, Bernh.in Schrad.Journ. 1799. Parmelia crispa, Achar. Meth. Lich. 254. Collema crispum, Hoffm. Fl. Germ. 100. Collema crenulatum, Hoffm. Fl. Germ. 103. Collema glaucescens, Hoffm, Fl. Germ. 105. Collema pulposum crispum, Achar, Lich. Univ. 652, On the ground among mosses, and on mountains. 4. Enchylium turgidum. Swollen enchyle. Thallus irregularly expanded, depressed, slightly lobed and tiledlike; lobes raised, thick, wartlike, wrinkled, gra-

Pl.cell.aph. S.HOMOTHALAMEiE. Sl.Enchyl. 397 nulated ; apothecia sessile, pitchei'shape, dark brown ; edffe slightly swollen ; outside wrinkled-granular. Collema turgidutn, Achar. Licli- Univ. 634. On rocks among mosses. 5. Enchylium tenax. Tough enchyle, Tliallus 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. Fl. Germ. 105. Collema tenax, Acliar. Lich. Univ. 635. Among mosses on rocks, adhering strongly to them. 6. Ejichylium pUcatile. Folding echyle^ Thallus round, tilewise; lohes thick, roundish, pleated in apothecia scattered, circles, wavey, rather upright, not cut ; sessile, hollow, colour of the thallus, edge not cut. Lichen plicatis, Achar. in N. Act. Stoch. \6, 11. Parmelia plicatilis, Achar. Meth. Lich. 240. Collema plicatile, Achar. Lich. Univ. 655. On rocks. 7. Enchyliimi fluviale. Biver enchyle. TAa//z/5 slightly cushion-like; lohes thick, crowded, blunt, complicately wavey, deeply cut ; apothecia near the edge, slightly globular, colour of the thallus, centre pitchershape edge nearly double. Lichenoides gelatinosutn opuntoides, Dillen in Raii Syn. 12, 58. Lichen Uuviatilis, Huds. Fl. Angl. 536. Parmelia fluviatilis, Achar. Meth. Lich. 249. Collema fluviale, Achar. Lichen. Univ. 636, On stones under water in rivulets. 8. Enchylium marginals. Marginal enchyle, Thallus orbicular, rather stellate, tiledlike; lobes deeply jagged, narrow, many-cut, winding, rather jflat, crenate; apothecia marginal and scattered, blackish-brown, edge not in the least cut. Lichenoides gelatinosum fuscum, jacobasK Muse. 140. maritimEB divisur&, Dillen. Lichen marginalis, Huds. Fl. Angl. 534 ; Engl. Bot. 1924. Parmelia melasna marginalis, Achar. Meth. Lich. 241. Collema laciniatum, Hoffm. FL Germ. 100. Collema melaenum marginale, Achar. Lich. Univ. 63T. On limestone rocks, occasionally overflowed.

Pl.cell.aph. S.HOMOTHALAMEiE. Sl.Enchyl. 397<br />

nulated ; apothecia sessile, pitchei'shape, dark brown ; edffe<br />

slightly swollen ;<br />

outside wrinkled-granular.<br />

Collema turgidutn, Achar. Licli- Univ. 634.<br />

On rocks among mosses.<br />

5. Enchylium tenax. Tough enchyle,<br />

Tliallus nearly orbicular, tilewise ; lobes rather thick,<br />

flat, lying down, nearly round, deeply cut and crenate<br />

apothecia scattered, immersed in the lobes, concave, reddish,<br />

edge scarcely cut.<br />

Lichen tenax, Swartz in N. Act. Ups. 4, 249.<br />

Parmelia tenax, Achar. Meth. Lich. 231.<br />

Collema tenax ? Hoffm. Fl. Germ. 105.<br />

Collema tenax, Acliar. Lich. Univ. 635.<br />

Among mosses on rocks, adhering strongly to them.<br />

6. Ejichylium pUcatile. Folding echyle^<br />

Thallus round, tilewise; lohes thick, roundish, pleated in<br />

apothecia scattered,<br />

circles, wavey, rather upright, not cut ;<br />

sessile, hollow, colour of the thallus, edge not cut.<br />

Lichen plicatis, Achar. in N. Act. Stoch. \6, 11.<br />

Parmelia plicatilis, Achar. Meth. Lich. 240.<br />

Collema plicatile, Achar. Lich. Univ. 655.<br />

On rocks.<br />

7. Enchyliimi fluviale. Biver enchyle.<br />

TAa//z/5 slightly cushion-like; lohes thick, crowded, blunt,<br />

complicately wavey, deeply cut ; apothecia near the edge,<br />

slightly globular, colour of the thallus, centre pitchershape<br />

edge nearly double.<br />

Lichenoides gelatinosutn opuntoides, Dillen in Raii Syn. 12, 58.<br />

Lichen Uuviatilis, Huds. Fl. Angl. 536.<br />

Parmelia fluviatilis, Achar. Meth. Lich. 249.<br />

Collema fluviale, Achar. Lichen. Univ. 636,<br />

On stones under water in rivulets.<br />

8. Enchylium marginals. Marginal enchyle,<br />

Thallus orbicular, rather stellate, tiledlike; lobes deeply<br />

jagged, narrow, many-cut, winding, rather jflat, crenate;<br />

apothecia marginal and scattered, blackish-brown, edge not<br />

in the least cut.<br />

Lichenoides gelatinosum fuscum, jacobasK<br />

Muse. 140.<br />

maritimEB divisur&, Dillen.<br />

Lichen marginalis, Huds. Fl. Angl. 534 ; Engl. Bot. 1924.<br />

Parmelia melasna marginalis, Achar. Meth. Lich. 241.<br />

Collema laciniatum, Hoffm. FL Germ. 100.<br />

Collema melaenum marginale, Achar. Lich. Univ. 63T.<br />

On limestone rocks, occasionally overflowed.

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