Rev. W. A. Leigh ton on the British Graphidese. 279 



a. vera. Lirellse radiate, like Chinese characters. 



Mostly on young oaks. Sussex ! Mr, Bonder. St. Leonard's 

 Forest ! Mr. Borrer. 



Thallus thin, membranous, pale yellow, continuous, smoothish, 

 somewhat verrucoso-rugose, in some states very rugose and rug- 

 ged, probably from age or peculiar locality, limited by a brownish 

 irregular line, slightly raised in a thin membrane as a thallodal 

 margin around the lirellse, which is sometimes almost obliterated. 

 Lirella scattered, rather close together but not crowded, va- 

 riously branched in a subradiate manner, the branches parallel 

 so as to resemble Chinese characters, very black, immersed, but 

 the disk on a level with the surface of the thallus. Disk plane, 

 black, with or without pruina, the proper margin veiy thin and 

 narrow, scarcely discernible. In section the perithecium is seen 

 to be confined to the sides of the lirellse alone, the base being 

 naked as in Graphis. 



13. elongata. Lirellse much more simple, slightly branched, 

 linear-oblong or lanceolate, extremities acute. 



Sussex ! Mr. Borrer. Bangor, Co. Down ! Mr. Wm. Thompson. 

 Corsygedol ! Rev. T. Satwey. Gloddaeth, Caernarvonshire ! ! 



With some resemblance to the simple lirellse of Hymenodecton 

 dendriticum, but the structure differs. 



7. divaricata. Lirellse with a single branch at right angles. 



Sussex ! Mr. Borrer. On ash, Gopsall Wood, Leicestershire ! 

 Rev. A. Bloacam. Oxfordshire ! Mr. Baxter in herb. Dr, Greville. 

 Dunscombes Wood, Cork ! Mr. I. Carroll. 



S. simpliciuscula. Lirellse smaller, simple. 

 Sussex ! Mr. Borrer, 



€. macularis. Lirellse very small, numerous, crowded, like 

 irregular rounded or oblong spots. 



Ireland ! Miss Hutchins in herb. Borrer. Bagley Wood, Ox- 

 ford ! Mr. Baxter in herb. Borrer. Sussex ! Mr. Borrer. Bangor 

 and Cultra, and Holywood House, Co. Down ! Mr. Wm. Thomp- 

 son. Llandrindod ! Rev. T. Salwey. Castle Bernard Park (syca- 

 more), Bandon, Ireland ! Rev. Prof. Hincks. Blarney, Ireland ! 

 Mr. I. Carroll. 



Under all forms distinguishable from Chiographa Lyellii and 

 Hymenodecton dendriticum by the structure of the lirella^. 



Plate VI. fig. 22. a, Vertical section of thallus and lirella; b, sporidia. 

 [To be continued.] 



