BRITISH LICHENS
BRITISH LICHENS
BRITISH LICHENS
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PHlEOGRAPHIS GRAPHlDACElE 277<br />
thin margins, the thallus forming a white pseudo margin ; perithecial<br />
wall contmuous as a dark line under the base; paraphyses<br />
closely conglutinate, inspersed with small granules, slightly<br />
swollen and brown at the tips; spores elongate, colourless, then<br />
brown, 7-8-septate, 42-48 {1. long, 9-12 {1. thick.---Opegrapha<br />
dendr1tica Ach. Meth. 31, t. 1, f. 10 (1803); Engl. Bot. t. 1756;<br />
Hook. in Sm. Engl. Fl. v. 147; Tayl. in Mackay Fl. Hib. ii. 106.<br />
Graphis dendritica Ach. Lich. Univ. 271 (1810). S. F. Gray Nat.<br />
Arr. i. 503; Mudd Man. 241; Cromb. Lich. Brit. 97; Leight.<br />
Lich. Fl. 367; ed. 3, 431 (incl. fl. Smithii and acuta). Hymenoclecton<br />
dendr1twum Leight. in Ann. Mag. Nat. Rist. ser. 2, xiIi.<br />
387, t. 7, f. 23 (1854) (inc!. vars. Smtthii & acuta).<br />
Exsicc. Larb. Lich. Coosar. n. 41; Carroll Lich. Rib. n. 11.<br />
Well differentiated by the whitish well· developed thallus and tho<br />
dendroid branchmg of the lirellre. Among the forms distinguished by<br />
Leighton, f. Sm2thii is marked by the more deeply.immersed apothecll1<br />
whICh branch at an obtuse angle, in this respect differmg from f. acula<br />
in which the angle is acute. Usually the carbonaceous waJI is thinly<br />
developed at the base of the apothecium, but in some forms it is thicker,<br />
and occasionally there is a gap, observable in section with the mICro·<br />
scope, causing the apotheeium to appear semidimidiate.<br />
lIab. On trees.-Distr. In wooded regions, chiefly in S. England<br />
and S. Ireland.-B. M. Guernscy; Rozel, Jersey; Hustyn Wood,<br />
Bodmin, Cornwall; Carisbrookc, and near Shanklin, I. of Wight;<br />
Totnes, Torquay, near Becky Falls, Ivy BrIdge and UIIacombe, Devon;<br />
Southton Common, Som('rset; Stoney Cross, near Bartley Lodge,<br />
Brockenhurst, and near Lyndhurst, New Forest, Hants; Minety,<br />
Wilts; Ardingly, St. Leonard's, TunbrIdge Wells, Tilgate, Danny,<br />
Charlton, near BrIghton, and Buckhurst Park, Sussex; near Penshurst,<br />
Kent; Shere, Surrey; Llttle Waltham, Pod's Wood, Messmg and<br />
Epping Forest, Essex; Craigforda, Shropshile; ncar Malvern, Wor·<br />
cestcrshire; near Dolgelly, Merioneth; Castle Bernard Park, Bandon,<br />
lUverstown and Rostellan, Cork; KIllarney, Kerry.<br />
Form obtusa A. L. Sm.-Apothecia rounded and obtuse at<br />
the ends, frequently furcate or sparingly branched, almost<br />
superficial, the thalloidal margin almost disappearing.-Hymenodecton<br />
dendriticum var. obtusa Leight. tom. cit. 388. Graphis<br />
dendntwa f. obtusa Leight. Lich. Fl. 368; ed. 3, 43l.<br />
A distinctlve form owing to the rather crowded and short blunt<br />
superfiCIal lircllre. Leighton notes branchmg at an obtuse angle as<br />
characterIstIC, but the branches form qUlte as frequently a right angle<br />
with the main apothecium.<br />
Ilab. On trees.-Distr. Rather rare, but coextensive with tho<br />
species.-B. M. Torquay and near I1sington, Devon; New Forest,<br />
Bants; Kemble, Wilts; Castle Bernard, Cork; Cromaglown, Killarney,<br />
Kerry.<br />
3. Ph. Lyellii A. Zahlbr. in Engler & Prantl Pflanzenf. i. 1*,<br />
99 (1905).-Thallus thin, membranaceous, smooth, pale-olive<br />
or rather dark (K + yellowish or yellow then red). Apothecia