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