BRITISH LICHENS

276 G itAPIi:mINElE PttJEOGRAl>ttIS
..
distinguished from other British members of the genus by the dis·
tmetly dimidlate apotheem, the· carbonaceous walls being developed
at the sidcs only.
Hab. On the bark of various trees.-Distr. Rather rare in the
Channel Islands, S. and Central England, and S. and W. Ireland, not
yet recorded from Scotland.-B. M. Beaumont, St. Lawrence, Jersey;
Withiel, Cornwall; Chudleigh, Lustleigh and near Lidford, Devon;
ncar Lyndhurst, New Forest, Hants; St. Leonard's Forest, Sussex;
Epping Forest, Hockley Woods, Hadleigh Woods, and Gosfield Hall,
Essex; Hollybush Hill, Malvern, Worcestershire; Glenbower Wood,
Cork; Clonmel, Tipperary; Louisburgh, Mayo.
Form divaricata A. L. Sm.-Thallus similar to that of the
species. Apothecia more elongate and scattered, occasionally
branching at right angles.-Graphis Smithii vars. elongata and
divaricata Leight. in Ann. & Mag. tom. mt. 279. G. inusta vars.
elongata and divaricata Mudd Man. 240 (1861); if. elongata and
divaricata Leight. Lich. FI. 369; ed. 3, 432.
Exsicc. Johns. n. 469.
Differs chiefly in the more elongate apothecia which are often acute
at the ends.
Hab. On the bark of various trees.-Distr. Rare in S., E. and N.
England.-B. M. Hurst, Balcombe and Newtimber Downs, Sussex;
Gosfield Hall and Codham Hall, Bockmg, Essex; Asby, Cumberland.
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. tom. cit. 279. G. inusta vars. macularis .
and simpliciuscula Mudd Man. 240 (1861); if. macularis and
simpliciuscula Leight. Lich. FI. 369; ed. 3, 432.
Exsicc. Larb. Lich. Coosar. n. 90; Leight. n. 285.
JIab. 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 and Bovey Tracey, Dcvon;
I. of Wight; New Forest, Hants; St. Leonard's Forest and Glynde,
Sussex; Penshurst, Kent; Braydon Forest, Wilts; Epping Forest,
Hadleigh Woods, Codham Hall, Messmg, and Barking. Essex; Malvern.
Worcestershire; near Barmouth, Merioneth; Bettws·y·Coed, Car·
narvonshire; Glenmire and near Cork; Killarney, Kerry; Loughcooter,
Galway.
2. Ph. dendritica Muell. Arg. in Flora lxv. 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 Clrcumference; disc rather broad and flat, pruinose, with