222 GEAPHIDEI [lITHOGRAPIIA 



2. L. flexelia A. Zahlbr. in Engler cfe Prantl Nat. Ptlan- 

 /cnf. i. 1*, p. 93 (1903).- -Thallus effuse, tliin, whitish, or nearly 

 obsolete (K — , CaCl — ). Ajjothecia su})er{icial, minute, black, 

 oblong or angular, the disc narrow and slit-like or irregularly 

 dilated ; hypothecium brown or blackish-brown ; paraphyses not 

 well discrete, dark at the apices ; spores 8 in the ascus, ovoid or 

 ellipsoid, minute, 0,004-6 mm. long, 0,002-3 mm. thick ; 

 hymenial gelatine bluish then sordid-wine-red with iodine. — 

 Limhoria flcaeUa Ach. in Vet. Acad. Handl. 1815, p. 258. 

 Xylograjpha jiexella Fr. Summa Veg. Scand. p. 372 (1849) ; Nyl. 

 in Mem. Soc. Sci. Nat. Cherb. v. p. 128 (1857); Cromb. in 

 Journ. Bot. xiv. p. 362 (1876) ; Leight. Lich. Fl. ed. 3, p. 392. 



An aberrant species, allied to Xylographa, but with a dark 

 carbonaceous hypothecium. 



Hab. On stumps of felled trees. — B. M. Oakley Park, near 

 Cirencester, Gloucestershire. 



3. L. Andrewii Stirton in Scott. Nat. 1878, p. 300.— Thallus 

 indeterminate, thickisii, subareolate, white or greyish-white 

 (K— , CaCl — ). Apothecia small, sessile or innate-sessile, 

 roundish or oblong, simple or rarely divided, the margins 

 prominent, black, the epithecium becoming applanate ; hypo- 

 thecium brownish ; paraphyses slender, discrete ; spores ellipsoid 

 or subgiobose 0,008-9 mm. long, 0,005-6 mm. thick, with a 

 distinct epispore ; hymenial gelatine not tinged, the asci tawny- 

 yellow, with iodine. ^ — Leight. Lich. Fl. ed. 3, p. 394. 



The apothecia in the single specimen seen are crowded ; Stirton 

 states that they are albo-velate in a young state. 



Hah. On a granitic rock in an upland hilly district. — B. M. Cairn 

 Edward, New" Galloway, Kircudbrightshire (the only locality). 



4. L. dendrographa Nyl. in Flora xlvii. p. 448 (1864).— 

 Thallus effuse, very thin, greyish (K — , CaCi — ), subevanescent. 

 Apothecia erumpent, linear, oblong or elliptical, simple or 

 Slightly divided-furcate, black, concolorous within ; epithecium 

 narrow, becoming applanate ; paraphyses slender, irregular, not 

 well discrete ; hypothecium brownish-black ; ascus polyspored ; 

 spores ellipsoid, 0,005-8 mm. long, 0,003-4 mm. thick ; hymenial 

 gelatine wine-red with iodine. — Cromb. Lich. Brit. p. 95 ; Leight. 

 Lich. FL p. 361; ed. 3, p. 393. 



In the British specimens the thallus is usually but little visible, 

 and becomes at length quite obsolete. The apothecia are numerous 

 and crowded, though at times somewhat scattered. When these are 

 simple the plant has very much the external aspect of a Hysterium. 



Hah. On the trunks of old trees in maritime and upland tracts. 

 Distr. — Hather local and scarce in S. and S.W. England. — B. M. Near 

 Sidmouth, Cockington, near Torquay and the Dart, Devon; Swanage, 

 Dorset ; Whitefield, I. of \Vight. 



