PH^OGRAPHIS] GRAPHIDACE^ 253 



branching at right angles. — Graphis Smithii vars. elongata and 

 divaricata Leight. in Ann. k Mag. I. c. p. 279. G. inusta vars. 

 elongata and divaricata Mudd Man. p. 240 (1861); ff, elongata 

 and divaricata Leight. Lich. Fl. p. 369 ; ed. 3, p. 432. 



Dififers chiejfly in the more elongate apothecia which are often acute 

 at the ends. 



Hah. On the bark of various trees. — Distr. Rare in S. and E. 

 England. — B. M. Hurst, Balcombe and Newtimber Downs, Sussex ; 

 Gosfield Hall and Codham Hall, Bocking, Essex. 



Var. macularis A. L. Sm. — Thallus whitish, usually forming 

 rather large determinate spots on the bark. Apothecia short, 

 rarely furcate, straight or curved, densely scattered over the 

 thallus. — Graphis Smithii vars. macularis and simpliciuscula Leight. 

 in Ann. & Mag. /. c. p. 279. G. inusta vars. macularis and simpli- 

 ciuscula Mudd Man. p. 240 (1861) ; fF. macularis and simpliciuscula 

 Laight. Lich. Fl. p. 369 ; ed. 3, p. 432. 



Exsicc. Larb. Lich. Csesar. n. 90 ; Leight. n. 285. 



Hah. On the bark of various trees. — Distr. More frequent than 

 the species in the same localities and also in Wales. — B. M. Rozel, 

 Jersey ; Withiel, Cornwall ; Torquay, Devon ; I. of Wight and Lynd- 

 hurst, New Forest, Hants ; St. Leonard's Forest and Glynde, Sussex ; 

 Penshurst, Kent ; Braydon Forest, Wilts ; Epping Forest, Hadleigh 

 Woods, Codham Hall, Messing, and Barking, Essex ; Malvern, Wor- 

 cestershire ; Barmouth, Merioneth ; Bettws-y-Coed, Carnarvonshire ; 

 Glenmire and near Cork ; Killarney, Kerry ; Loughcooter, Galway. 



2. Ph. dendritica Muell.-Arg. in Flora Ixv. p. 382 (1882).— 

 Thallus white or greyish, thin or rather thick, more or less 

 wrinkled (K + yellow then red). Apothecia somewhat variable, 

 long or short, acute at the ends, or almost round, brownish-black, 

 immersed, scattered, curved or straight and sparingly branched 

 towards the centre of the thallus, usually branched and radiating 

 at the circumference ; disc rather broad and flat, pruinose, with 

 thin margins, the thallus forming a white pseudomargin ; peri- 

 thecial wall continuous as a thin line under the base ; paraphyses 

 closely conglutinate, inspersed with small granules, slightly 

 swollen and brown at the tips ; spores elongate, colourless then 

 brown, 7-8-septate, 0,042-48 mm. long, 0,009-12 mm. thick. — 

 Opegrapha dendritica Ach. Meth. p. 31, t. 1, f. 10 (1803); Engl. 

 Bot! t. 1756 ; Hook, in Sm. Engl. Fl. v. p. 147 ; Tayl. in Mackay 

 Fl. Hib. ii. p. 106. Graphis dendritica Ach. Lich. Univ. p. 271 

 (1810). S. F. Gray Nat. Arr. i. p. 503; Mudd Man. p. 241 ; 

 Cromb. Lich. Brit. p. 97 ; Leight. Lich. Fl. p. 367 ; ed. 3, p. 431 

 (inch ff. Smithii and acuta). Hymenodecton dendriticum Leight. in 

 Ann. Mag. Nat. Hist. ser. 2, xiii. p. 387, t. 7, f. 23 (1854) (incl. 

 vars, Smithii & acuta). 



Exsicc. Larb. Lich. Caesar, n. 41 ; Carroll Lich. Hib. n. 11. 



Well differentiated by the whitish well-developed thallus and the 

 dendroid branching of the lirellae. Among the forms distinguished by 



