BRITISH LICHENS

ao CYdLOC.ARPINElE LECIDEA
the apices; spores ellipsoid, minute, 7-9 [J. long, 3·5-4·5 [J. thick;
hymenial gelatine pale-bluish then tawny-reddIsh with iodine.­
Mudd Man. 196; Leight. Lich. Fl. 260;- ed. 3, 256. L. decolorans
subsp. flexuosa Cromb. Lich. Brit. 66 (1870). Biatora flexuosa
Fr. in Vet. Ak. Hand!. 1822, 268 (nomen) & Sched. erit. viii. 11
(1826).
Exsicc. Cromb. n. 80; Larb. Lich. Rb. n. 341.
The thallus in some of the spebimens resembles that of Leca'IWra
conizfEa, with whlCh it might be confused in a sterile c(Jlldition. It
differs from the precedmg species in the more finely granulose crust,
in the constantly darker apothecia and in thc much smaller spores.
British specimens seen are well fertile.
Hab. On old pales and stumps of trees, chiefly larch, in upland
wooded districts.-Distr. Rather local, though plentiful where it
occurs, in Great Britain; not seen from Ireland.-B . .1If. Near UlIa·
combe, Bovey Tracey, Devon; Bardon Hill, Leicestershire; Haughmond
Hill, Shropshire, near Llanwrtyd; Lounsdale, Cleveland, York·
shire; Teesdale, Durham; Staveley, Westmorland; Glen Falloch,
Graig CaIIiach, and Achmore, Killin, Perthshire; Countesswells Woods,
near Aberdeen.
Form reruginosa Leight. Lich. Fl. 260 (1871); ed. 3, 256.­
Thallus leprose-pulverulent, dark verdigris-green; otherwise as in
the species.-Lecidea mruginosa Borr. in Engl. Bot. Sup pI. t. 2682
(1831); Rook. in Sm. Engl. Fl. v. 181. L.jlexuosa var. (3 roruginosa
Mudd Man. 197 (1861).
Exsicc. Leight. n. 406; Larb. Lich. Rb. nos. 65, 66; Johns. n.
442.
Differs merely in the darker thalline granules becoming dissolved
into an reruginose powder. It often occurs sterile and might then be
taken for the Lepraria form of some othcr species.
Hab. On old pales and on the bark of old trees in upland wooded
situations.-Disir. Not uncommon throughout England; rare in S.
Ireland; not seen from Scotland.-B. M. Highbeech, Epping Forest,
and Chelmsford, Essex; near MIll Hill, Middlesex; Leith Hill, Surrey;
Bolney, Ardingly, Cuckfield and Henfield, Sussex; Lyndhurst, New
Forest, Hants; Ullacom be, near Bovey Tracey, Devon; near Virginia
Water, Berks; Harboro' Magna, Warwickshire; Babraham Park,
Cambridgeshire; North Wootton:Norfolk; Goyt Bridge, near Buxton,
Derbyshire; Twyeross, Leicestershire; Battenhall, Worcestershire;
Morda, Oswestry, Shropshire; Baysdale, Cleveland, Yorkshire;
Staveley, Westmorland; Whitehaven, Cumberland.
31. L. viridescens Ach. Meth. 62 (1803).-Thallus effuse, thin,
minutely granulose-Ieprose, pale-greenish (Kf + yellowish,
K(CaCI) + crimson). Apothecia minute, almost sessile, subconvex,
subimmarginate, opaque, brownish- or dull-black, within
dark or whitish; hypothecium and hymenium, pale or yellowish;
paraphyses slender, subconcrete, brown 'at the apices; spores
ellipsoid, 10-13 [J.long, 4-6 [J. thick; hymenial gelatine bluish with
iodine.-Mudd Man. 196; Cromb. Lich. Brit. 67; Leight_ Lich.
FI. 264; cd. 3, 262. Lichen vin'descens Schrad. SpiciI. 88 (1794).