278 Hcv. W. A. Leighton on the British Graphidese. 



and flat, but still narrow when wetted, brown, slightly pruinose, 

 surrounded by the thin, prominent, wavy, curved, and crisped 

 proper margin. 



No. 91 (specimen on beech) in Mr. Borrer^s copy of 1st ed. 

 Schser. Lich. Exsicc. and No. 88 in my copy of " ed. alt. immut." 

 are referable to this variety. 



B. fleocuosa. Lirellse variously flexuose. 



On beech. St. Leonard's Forest, Sussex ! Mr. Borrer. New 

 Forest, Hants ! Mr. Lyell in herb. Borrer, 



Thallus much thicker and more tartareous than in the pre- 

 ceding varieties, extensively cracked, pulverulent and white, 

 irregular and rugose, raised into spurious margins around the 

 lirellse, pale yellow or cream-colour, bounded by a brown line. 

 Lirella very numerous and crowded, either simple and curved, 

 or branched from the middle or the extremities, simply or re- 

 peatedly flexuose, curved and twisting in all directions, and with 

 all degrees of curvature, in the more closely crowded specimens 

 anastomosing one with the other, immersed, scarcely prominent, 

 obtuse and rounded at the extremities in the branched form, 

 more acutely pointed in the simple form, though more or less 

 elongated, yet stout and clumsy in general aspect. Disk 

 rimseformi-canaliculate, more or less open, encompassed by the 

 stout, rounded, prominent, incurved, wavy, proper margin, not 

 pruinose. 



In what appears to be a very old state of this flexuose variety 

 on oak in Mr. Borrer's herbarium, and which resembles a frag- 

 ment in the same collection from Acharius, labelled " Graphis 

 serpentina, var. eutypa, Ach., an a Gr. rugosa distinctaV the 

 thallus is quite tartareous, pulverulent and white, altogether 

 raised into innumerable prominent rugosities, by their proximity 

 almost obliterating the slender, narrow, elongated, branched, 

 flexuose lirellse, which are situate in the hollows or interstices 

 between the rugosities. 



5. Graphis Smithii. Thallus thin, membranaceous, even or 

 rugose ; lirellse immersed, broad, simple or branched in a sub- 

 radiate subparallel manner ; proper margin very narrow; thallodal 

 margin thin and membranous ; disk plane, naked or pruinose ; 

 sporidia eight, in asci, linear, margined, rounded at the ends, 

 containing 6-8 transversely oval, margined spores. 



Opegrapha scripta, Sm. E. Bot. 1813 (not of Ach.) (1807). 

 Lyellii, Hook. Br. Fl. 2. 147 (in part). 



On hazel, in a wood at the Berrow, south end of Malvern 

 Range, Worcestershire ! Mr. E. Lees. 



