264 Rev. W. A. Leighton on the British Graphidese. 



178. Pal^ornis cyanocephalus, L. Malitchia and Battoo- 

 girawa, Cing. 



Found throughout the island except in the northern province. 

 It is very commonly seen in confinement in the native houses, 

 and is easily domesticated. Nestles in hollow trees : eggs four, 

 pure white and rounded. 



[To be continued.] 



XXV. — Monograph of the British Graphidese. 

 By the Rev. W. A. Leighton, B.A., F.B.S.E. 



[Continued from p. 212.] 



2. Gr aphis, Ach. 



Apothecium lirellseform, immersed ; perithecium carbonaceous, 

 dimidiate or confined to the sides, the base being naked ; disk 

 canaliculate, surrounded with a proper margin and an accessory 

 thallodal margin. Thallus crustaceous or membranaceous. 



Name from f/pa(f)h, a design or sketch. 



1. Graphis scrijita, Ach. Thallus thin, membranaceous, con- 

 tinuous, even ; lirellae emergent, slender, contracted here and 

 there, extremities acuminate ; proper margin thin, elevated, wavy 

 and crisped ; thallodal margin membranaceous ; disk rimseform, 

 naked ; sporidia eight, in asci, oblong or oval, margined, contain- 

 ing 8-10 horizontal rows of subrotund, margined, yellow spores. 



Lichen scriptus, (Linn.) Ach. Prodr. 25 (1798). 



Opegrapha scripta, Ach. Meth. 30 (1803); Fries, L. Ref. 370 (in part); 



Hook. Br. Fl. 2. 147 (in part) ; Tayl. Fl. Hib. p. 2. 106 (in part) ; 



Bohler's Lich, Brit. no. 28 ! 

 Graphis scripta, Ach. L. Univ. 265 (1810). 

 scripta », Ach. Syn. 81 (1814); Spreng. Syst. Veg. 4. p. 1. 252 (in 



part). 

 pulverulenta, x. phleeodes,W&\\r. Crypt. Germ. 330 (in part) (1827). 



Plate VI. fig. 17. a. Vertical section of thallus and lirella; b, sporidia — 

 all magnified in different degrees. 



The following varieties are noticeable : — 



a. diffusa. Lirellae rather long, simple or with a single branch, 

 variously curved and wavy, lying in all directions. 



On oak. Sussex I Mr. Borrei\ Cultra, Co- Down ! Colin 

 Glen, Belfast ! Mr. W. Thompson. 



Thallus thin, membranaceous, very pale whitish yellow or 

 cream-colour, continuous and entire, or cracking, breaking up. 



