Lecidea pulverea Borr. in Engl. Bot. Suppl. t. 2726 (1831) -
Hook in Sm. Engl. El. p. 181; Tayl. in Mackay PI. Hib. ii!
p. 126 ; Cromb. Lich. Brit. p. 8 9 ; Leight. Lich. PI. p. 322 • ed
3, p . 334.
Exsicc. Bohl. n. 90; Cromb. n. 187; Larb. Lich. Hb. n. 150..
Resembles B. LigUfootii var. commutata, but is easily dis-
tmguished by the larger spores. The apothecia are, according to
Nylander (Flora li. p. 347), at times pale-ilesh-coloured, which is not
the case in the British specimens.
_ Hab. On trunks of old trees generally near the roots, rarely
incrusting mosses on rocks in maritime and mountainous districts.—
EtsZr. Somewhat local, though usually plentiful where it occurs
throughout the Bntish Is le s .-E . U. Withiel, Cornwall ; near Torquay
and Lustleigh, Devon; New Forest, Hants; Ardingly and St.
Leonard s i orest, Sussex ; Capel Gym and Barmouth, Merioneth ;
Maltby Wood Yorkshire; Windermere, Westmoreland; Keswick,
Cumberland; Fai s of Clyde, Lanark; Barcaldine, Argyll; Glen
Falloch Glen Lochay and Aberfeldy, Perthshire; Glengariff, Cork;
Mangerton, Muokruss, Dromore and Turk Mt., Kerry; Addergoole,
near Kylemore, Glendalough and Doughruagh Mt., Galway.
25. B. Lightfootii Mudd Man. p. 179 (1861).—Thallus
determinate or subeffuse, thickish, granulose-verrucose, greenish-
white or greenish-grey ( K - , C aC l- ) . Apothecia moderate,
subinnate-sessile, plane or ra th e r convex, slightly shining, dark-
brown or black, margined, the margin thin, smooth, entire or
flexuose, paler ; paraphyses concrete, brown a t the apices ; hypothecium
pale-greyish ; spores ellipsoid, faintly 1-septate, constricted
in the middle.—Lichen Lightfootii Sm. Engl. Bot. t. 1451 (1805)
Lecidea Lightfootii Ach. Lich. Univ. p. 177 (1810) ; S. P. Gray
PI. V. p. 180; Cromb.
LicK B n t. p. 65 ; Leight. Lich. PL p. 319 ; ed. 3, p. 333
Exsicc. Larb. Lich. Hb. n. 106.
_ Somewhat similar in habit and appearance to L. jiarasem-a The
innate apothecia ^ occasionally seem as if crowned by the thalline
granules, which, m conjunction with their paler margin, suggests a
Lecanora ¡ them are, however, no traces of a true thaUine margin.
some habitats (e.y firs) the thallus is much thinner with the
granules more scattered and the apothecia smaller. The spermogones
are small and brown ; the spermatia subglobose and very minute
0,002 mm. long, 0,0015 mm. thick.
.smooth trunks of trees, chiefly birch, rarely fir, in
upland wooded districts.—EisZr. Not unfrequent in England, Wales
R l) • Hill, Surrey; St. Leonard’s Forest,,
CuelliiA Petworth, near Eastham,
V Hayward’s Heath and Wiggonbolt Common, Sussex;
I pwfZ ’ Dants; Ullacombe, Dartmoor, Devon;
Lewknor, Oxfordshire; near Raider DÙ, Radnorshire; Dolymelynen
Baysdale, Riverstown, Cork ; Dunkerron, Kerry. Cleveland, Yorkshire;
Var. ^ commutata Mudd I. c.— Thallus granulose-leprose or
subpulverulent, greenish-grey. Apothecia as in the type.—Lecanora
commutata Ach. Lich. Univ. p. 352 (1810). Lecidea Lightfootii
var. ¡3 commutata Schær. Enum. p. 138 (1850) ; Cromb.
Lich. Brit. p. 65 ; f. commutata Leight. Lich. El. p. 319 ; ed. 3,
p . 333.
Might perhaps be regarded as merely an old condition, characterized
by the thallus becoming dissolved and pulverulent throughout.
Transition states to the type are not wanting, and in otherwise typical
specimens the granules are here and there deliquescent. Schærer
describes the apothecia as being also carneous or reddish-brown,
colours not visible in his own specimen or in ours ; they are blackish
and sometimes slightly umbonate.
Hab. Cn the trunks of old trees, rarely on old palings, in maritime
and upland tracts.—Distr. Rare in S. England, S. Ireland, and the
Channel Islands.—B. M. Patrimonie, Jersey ; near Parham, Sussex ;
Brockenhurst, New Forest, Hants ; near Cirencester, Gloucestershire ;
Killaloe, Clare ; Cahirlogue, near Glenmire, and Agharda, Cork.
26. B. atropurpúrea Massal. Ric. Lich. p. 135 (1852).—
Thallus effuse, thin, granulose-leprose, greenish-grey (K —,
CaCl — ). Apothecia small, appressed or adnate, plane, thinly
margined, purplish- or brownish-black ; paraphyses discrete,
brownish a t the apices ; hypothecium pale ; spores subellipsoid,
0,011-15 mm. long, 0,005-7 mm. th ick ; hymenial gelatine pale-
bluish then deep-wine-red with iodine.—Mudd Man. p. 178.
Lecidea sphæroides var. ¡3 atropurpúrea Schær. Spicil. p. 165
(1833). L. atropurpúrea Cromb. Lich. Brit. p. 64 (1870) ;
Leight. Lich. El. p. 324 ; ed. 3, p. 338. L. atropurpurascens
Nyl. in Flora Ivi. p. 294 (1873) ; Leight. Lich. FI, ed. 3, p. 338.
Exsicc. Larb. Lich. Hb. n. 151 ; Johns, n. 338.
Hab. Cn trunks of old trees in wooded maritime and upland
districts.—Distr. Cnly a few localities in S. England, Wales, and
W. Ireland; not seen from Scotland.—B. M. Rozel, Jersey; St.
Leonard’s Forest and Chillington, Sussex ; New Forest, Hants ;
Cockington, Devon ; Selhurst, Surrey ; Stanstead Park, Essex ;
Garth, Dolgelly, Merioneth ; Gwydir Woods, Bettws-y-Coed, Denbighshire
; Calder Abbey Grounds, Cumberland ; Glenbower Wood, Cork ;
Dinish, Cromaglown and Glengariff, Kerry; Lough Inagh, Connemara,
Galway.
27. B. iutermixta A. L. Sm.—Thallus determinate, thin,
subgranulose-rugulose, greyish or greyish-green (K + yellow,
CaCl — ). Apothecia moderate, plane or somewhat convex,
brownish-black or black, the margin obtuse, thin, a t length
ob lite ra ted ; dark w ith in ; paraphyses slender or not well
d isc re te ; epithecium slightly blackish; hypothecium reddish-
brown (K + violet) ; spores ellipsoid or oblong, 0,015-18 mm.
long, 0,006-7 mm. th ic k ; hymenial gelatine bluish then wine-red
with iodine.—Lecidea intermixta Nyl. in Ann. Sci. Nat. ser. 4, iii.
p. 161 (1855); Cromb. Lich. Brit. p. 64 ; Leight. Lich. FI. p. 314.