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Pl.cell.aph, 4. CENOTHALAME^. 115.Lecidea. 46»
a. Apothecia always black, naked.
1. Lecidea atro-alha. Pied lecidea.
Crust spreading, very thin, cracked, black ; beds tuber-
cular, whitish ; apothecia plano-convexish, black ; inside
of the same colour.
Lichen atro-albus, Lin. S. P. 1607 ;
Veirucaria cUro-aiba, Hoffm. Germ. \&-i.
Lecidea atro-alba, ^c/iar. J»/e//i. 43; Lich. IQ'i.
On stones.
Thallus sometimes fringed on the edge.
Engl Bot. 2336.
2. Lecidea fusco-atra. Brown-Hack lecidea^
Crust very thin, black; beds chestnut, flat, bordered,
shining; afjothecia slightly convex, black, bordered; internally
whitish.
Lichen fusco-ater, Lin. S. P. 1607.
Lichen dendiiticus, ^cAor. Prorf. 77 ; Engl. Bot. 1734.
Verrucaria fusco-ater, Ilo/fm. Germ. 181.
Psora dendritica, Hoffm. Germ. 168.
Lecidea fusco-atra, Achar. Mel/i. 44.
Lecanora fusco-atra, ^cArtr.iu/i. 359.
On stones and exposed mountains.
Thallus sometimes fringed, black.
3. Lecidea fumosa. S7noky lecidia.
Crust rather cartilaginous, cracked in beds, smooth, grey,
brownish ; apothecia sunk in the crust, flat, bordered, afterwards
convex and conglomerated, not bordered, black ; in-
side blackish grey.
Lichen artliroocarpus, Achar. Prod. 77;
Lichen gibbosus, Dickn. Crypt. 2, 6.
Verrucaria fumosa, Hoffm. Germ. 190.
Engl. Bot, 1829.
Lich, 157.
Lecida cecumena, Achar. Melh. 42 ;
Lecidea fumosa, >:fc/iar. Z,£cA. 137.
On stones, and dry, exposed rocks.
4. Lecidea petrcea. Rock lecidea.
Crust thin, round, very finely cracked, nearly powdery,
white; apothecia innate in the crust, thick, protuberant,
nearly concentric, black ; inside same colour ; centre sunk
in, edge swollen, raised, rather squeezed up.
Lichen concentricus, Davies Lin. Tr. 5, 284 ;
Lichen petra'us, Wulf. in Jacq. Coll. 3, 116.
Verrucaria petrasa, Hoffm. Germ. 184.
Lecidaea petraea, Achat, Meth. 37 ; Lich. 155.
On stones and rocks.
Engl. Bot. 246.