Hab. On decaying trunks and stumps of trees in wooded maritime
and upland districts.—Bistr. Very local in S. England and the
S. Grampians, Scotland.—B. M. Shanldin, I. of Wight ; Lymington,
Han ts; near Buckfastleigh, Devon; Cirencester, Gloucestershire;
Loch Katrine, Perthshire (f. pallida).
18. B. prasina Syd. Plecht. Deutschl. p. 166 (1887).-—
Thallus effuse, thinnish, contiguous or scattered, subgranulose-
leprose, sordid-greenish ( K - , C aC l- ) . Apothecia minute,
innate-sessile, convex, immarginate, livid-brown or blackish, concolorous
within; paraphyses coherent; epithecium and hypothecium
colourless ; spores oblong-ellipsoid, simple or 1-septate,
0,011-12 mm. long, 0,004 mm. th ick ; hymenial gelatine bluish
then sordid-wine-red with iodine.—Micarea prasina F r. Syst.
Orb. Veg. p. 257 (1825). Lecidea prasina Schær. Enum. p. 137
(1850); Mudd Man. p. 196; Leight. Lich. PI. p. 263; ed. 3,
p. 261. L. prasiniza Nyl. in Flora Ivii. p. 312 (1874) & Ixiv.
p. 7 (1881); Cromb. in Journ. Bot. xiii. p. 141 (1875); Leight.
Lich. FI. ed. 3, p. 338.
Differs from B. erysihoides chiefly in the rather more developed
thallus, the colour of the smaller, more convex apothecia and the
often simple spores. The few British specimens gathered are well
fertile ; but the sterile pulverulent thallus spreads extensively over the
substratum.
Hdb. On old trunks of trees in a maritime locality.—Bistr. Rare
in England and S.W. Highlands of Scotland.—E. M. Lyndhurst,
Hants ; Barcaldine, Argyll.
Var. byssacea A. L. Sm.—Thallus minutely granular, dirty-
greenish. -Apothecia dark ; paraphyses dark a t the tips.—Biatora
hyssacea Zwackh. in Flora xiv. p. 510 (1862). Lecidea erysihoides
f. sordidescens Nyl. ex Norrlin in Not. Sallsk. Faun. & PI. Fenn.
n. ser. viii. p. 208 (1871) ; Cromb. Lich. Brit. p. 72 ; Leight.' Lich.
FI. p. 323 ; ed. 3, p. 343. Biatorina prasiniza f. hyssacea Arnold
Lich. FI. Münch, p. 24 (1897).
Differs from the type in the darker colour of the apothecia and
of the paraphyses.
Hab. On old decorticated trees.—E. M. Lyndhurst, New Forest,
Hants.
19. B. globulosa Koerb. Syst. Lich. Germ. p. 191 (1855).—
Thallus effuse, very thin, granulose-pulverulent, whitish ( K - ,
C aC l- ) , often evanescent. Apothecia small, adnate, convex,
immarginate, blackish or leaden-black, greyish within; paraphyses
concrete ; epithecium blackish ; hypothecium pale or
slightly sordid above ; spores oblong or fusiform-oblong, simple
or thinly 1-septate, 0,009-0,014 mm. long, 0,002-4 mm. thick ;
hymenial gelatine bluish then dark-wine-red with iodine.—
Lecidea globulosa Floerke Deutsche Lich. lief. 10, p. 1 (1821);
Carroll in Journ. Bot. v. p. 256 (1867); Cromb. Lich. Brit!
p. 69 ; Leight. Lich. PI. p. 319 ; ed. 3, p. 334. L. anomala
Nyl. Lich. Scand. p. 202 (non Ach.) ; Leight. Lich. FL p. 318 ;
ed. 3, p. 337. Biatora anomcda Fr. in Vet. Acad. Handl. 1822,
p. 226. Bilimbia anomala Mudd Man. p. 187 (1861) pro parte.
Exsicc. Mudd n. 155.
Hab. On the bark of trees.—Distr. Not uncommon throughout
the British Isles.—E . M. Ulting, Hadleigh and Hockley, Essex;
Chelworth, Wilts ; Ayton, Cleveland, Yorkshire ; Glenoar, Kerry.
20. B. fallax A. L. Sm.—Thallus effuse, thin, subleprose,
blackish-green. Apothecia yellowish-flesh-coloured, somewhat.
convex, becoming immarginate, entirely colourless within ; paraphyses
slender, distinct ; spores oblong or oblong-fusiform,
0,009-13 mm. long, 0,003 mm. thick ; hymenial gelatine blue
then violet with iodine.—Biatora fa lla x Bepp Flecht. Eur. n. 505
(1860) (excl. syn). Lecidea fa lla x Leight. Lich. FI. p. 320
(1871); ed. 3, p. 342. L . cldorotiza Nyl. in Flora xlix. p. 85
(1866) {fide Leight. U. c.) ; Cromb. Lich. Brit. p. 70.
There are no specimens in the British Museum. ^ Hepp plainly
indicates the 2-oelled spores which exclude it from Lecidea.
Hab. On elm bark.—Distr. Recorded only from S. England (I. of
Wight and Somerset).
21. B. spodiza A. L. Sm.—Thallus effuse, thin, subopaque,
minutely granulate, dark-greyish or inspersed with minute
greyish-green granules (K(CaCl) + deep-red). Apothecia small,
somewhat convex, immarginate, livid-greyish or pale-livid, colourless
within ; epithecium sordid ; paraphyses not well discrete ;
hypothecium colourless ; spores oblong, a t times somewhat
curved, simple, occasionally obsoletely or spuriously 1-septate,
0,011-17 mm. long, 0,0025-35 mm. th ic k ; hymenial gelatine
bluish with iodine.—Lecidea spodiza Nyl. in Flora Ivii. p. 9
(1874); Cromb. in Grevillea ii. p. 140; Leight. L ic h ., FI. ed. 3,
p . 339.
Closely allied to the following. In the original locality, the thallus
spread extensively over the substratum, but was only here and there
fertile ; the apothecia in the specimens are somewhat scattered.
Hab. On an old fir 'paling in a wooded upland d is tr ic t.-E . M.
Killin, Perthshire (the only locality).
22. B. synothea Koerb. Parerg. Lich. p. 144 (1860) (excl.
var. chalyhæa).-T h a llu s effuse, thin, minutely granulose, greyish-
green or whitish (K —, CaCl — ), a t times nearly evanescent.
Apothecia small, adnate or appressed, convex, subimmarginate,
dark-brown, black or blackish; hypothecium thin, colourless,
paraphyses dark a t the apices; epithecium K + v io le t; spores
oblong, ellipsoid-oblong or fusiform, straight or slightly curved,
occasionally simple, 0,007-13 mm. long, 0,0025-40 mm. thick ;
hymenial gelatine bluish then wine-red with iodine ; spermogones