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Pl.cell.aph. 4. CENOTHALAMEiE. 115.Leci(lea. 467
18. Lecidea idiginosa. Bog lecldea.
Crust granulated, rather gelatinous, brownish green;
apolhecia pressed close, bordered, at last hemispherical,
crowded, black ; inside similarly coloured.
Lichen uligincsus, Schracler Spicil. 88 ;
Engl. Bot. 1466.
Lichen huinosiis, Ehrh. Crypt. 135.
Verrucaria uliginosa, Ilcffm. Germ. 190.
Verrucaria humosimilis, Hoff'm. Germ. 190.
Lecidea uiiginosa, Achar. Meth. 43 ; Lich. ISO.
On the ground in turfy, boggy places.
b. Apothecia Hack, naked, when 7noistened reddish or
brownish.
19. Lecidea immersa. Sunk lecidea.
Crust spreading, thin, scarcely lobed, whitish ; apothecia
plano-concave, sunk even into the stone, bordered, black
centre rather hoary, when moistened very dark blood-red,
at last slightly convex, inside whitish.
Lichen immersus, Schrad, Spicil. 1; Engl. Bot. 193.
Lichen calcivorus, Ehrh. Crypt. 244.
Verrucaria alrosanguinea, Hoffrn. Germ. 192.
Verrucaria iininersa ? Iloffni. Lich. 12.
Lecidea immersa, Achar. Meth. 34 ; Lich. 153.
On limestone.
Thallus almost as hard as the stone itself, although per-
fectly distinct; apothecia fall out in time, leaving their cavities
in the thallus, which is very permanent.
20. Lecidea rivulosa. Rivulet lecidea.
Crust cracked in beds, brownish grey divided by black
lines; apothecia sessile, flat, growing convex, bordered, irregular,
black; inside whitish; when moistened brown.
Lecidea rivulosa, Achar. Meth. 38.
Lichen rivulosus, Engl, Bot. 1737.
Lecanora falsaria rivulosa, Achar. Lich. 356.
On quartz rocks. 4
Thallus when moistened umber-brown; apothecia when
moistened brown in the centre, border keeps its own colour;
small apothecia are scattered amongst the others.
c. Apothecia black, greenish, grey, hoary.
21. Lecidea cdho-ccBrulescens Bhdsh-wliite lecidea.
Crust tartarlike, contiguous, even, when old cracked,
whitish ; apothecia sessile and elevated, flat, black, with a
bluish bloom ; border free, bent, naked, black.
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