Rev. W. A. Leighton on the British Graphidese. 271 



lirellae, bounded wliere it meets other lichens by a browTi, rather 

 broad, wavy, irregular line. Lirella numerous and rather 

 crowded, lying scattered irregularly in all directions, and of va- 

 rious shapes and sizes, either straightish, or curved and wavy 

 more or less, either simple or furcate at one extremity, or ^N'ith a 

 longer or shorter simple branch from about the middle at right 

 angles, or branched near one extremity, slender, narrow and 

 elongated, of about the same width throughout, and terminating 

 in a point either quite obtuse or more or less acute, scarcely if 

 at all elevated above the level of the spurious margin. Disk in a 

 dry state rimseform or verj- slightly channelled, when wetted 

 expanded, but still narrow, slightly pruinose, surrounded by a 

 thinnish black proper margin which is very much cuned, wavy 

 and crisped. 



B.flexuosa. Lii-ellse very elongated and slender, flexuose, 

 simple. 



On oaks. Sussex ! Mr. Borrer. Castle Bernard Park, Ban- 

 don, Ireland ! Rev. Prof. Hincks. 



Thallus in colour, structm-e and appearance similar to the 

 last. Lirellce very elongated and slender, flexuose, curved and 

 twisted in all directions, for the most part simple, but some with 

 a minute furcation, or a large forked branch at one extremity, 

 entire or simple at the other, either straight at the extremities or 

 sometimes one or botb ends suddenly bent or curved, immersed 

 and not raised above the level of the spurious margins, of the 

 same width throughout, extremities obtuse. Disk rimseform 

 when dr\, when wet expanding, but still very narrow, of the 

 same width throughout, pruinose, surrounded with a thin ele- 

 vated flexuose, crisped, black, proper margin. 



In Mr. Borrer's copy of the 1st edition of Schserer's 'Lich. 

 Exsicc.,' " No. 90. Opegrapha scripta, S. ahietina, Schaerer," 

 growing on firs, making allowance for slight diflerences resulting 

 probably from the nature of the bark, seems referable to this 

 variety. The sporidia show it to belong to G. serpentina and not 

 to scripta. The right-hand specimen attached to this seems to 

 belong to our variety diffusa. The same may be said of the two 

 specimens of No. 90 in '' edit. alt. immut." 



e. horizontalis. Lirellae crowded, very long and slender, dis- 

 posed horizontally. 



On oaks. Sussex ! Mr. Borrer. Holly Bush Hill, Malvern 

 Range, Worcestershire ! Mr. E. Lees. 



Thallus thin, membranous, subtartareous, pale yellow, thickly 

 covered with minute tubercles, paler in colour, which give to it 

 a whitish appearance, distinct towards the margin, confluent in 



