BRITISH LICHENS

280 G RAPHIDINElE GRAPHINA
simple or branched, disc narrow or dilated and often whitishpruinose,
tapering towards the ends.-Opegrapha pulverulenta Sm.
Eng!. Bot. t. 1754 (1807) 1 (excl syn.) (non Pers.). Graphis scripta
vars. flexuosa and dwaricata Leight. in Ann. Mag. Nat. Rist.
ser. 2, xiii. 265, 266 (1854). G. pulverulenta Leight. tom. cit.
268, t. 6, f. 18. G. sophistica ff. flexuosa and divaricata, and var.
pulverulenta Leight. Lich. F!. 371 (1871); ed. 3, 434; var.
dendriticoides Leight. l. c. 435 (1879). Stenographa anguina
vars. jlexuosa and pulverulenta Mudd Man. 236 (1861).
Exsicc. Johns. n. 471; Leight. n. 18 (as Graphis scripta var.
jlexllosa), n. 19 pro parte (as G. scnpta var. divancata), n. 20 (as
G. pttlverulenta),. Larb. Lich. Rb. n. 236.
Differs from the species, more partICularly III the character of the
thallus, wInch IS often very pulverulent. The apothecia are usually
narrow, as in the species, but frequently become dilated and pruinose.
Smith's figure of Opegrapha pulverulenta in Eng!. Bot. closely resembles
the outward aspect of the plant, but I have been unable to find a
specimen III his herb anum to verIfy the internal structure.
Hab. On twes III wooded reglOns.-Dislr. Somewhat frequent in
the S. of England and in S. and W. Ireland, rarer in N. England and
Wales, eVIdently not yet found in Scotland.-B. 111. Lyndhurst. New
Forest, and 1. of Wight, Hants; Mldhurst, Tllgate, Ardlllgly and
Balcombe, Suss!.'f'; Hadleigh and Hockley Woods, Messmg, Stansted
Mountfitchet and Epping Forest, Essex; Gloddaeth, near Conway and
Gwydir Woods, Bettws.y-Cocd, Carnarvonshlre; Holly Park. near
Stokesay, Shropshire; Newton Wood and Ayton, Cleveland, Yorkshire;
WhItehaven, Cumberland; Crosshaven, Cork; Castleconnel, Limerick;
K.illaloe, Clare; KIllarney, Kerry; near Clifden, Connemara, Galway;
Malaranny, Achill, Mayo.
2. Gr. inustula A. L. Sm.-Thallus thin, white, slightly
warted and wrinkled, subdeterminate (K + orange-yellow).
Apothecia immersed, thinly scattered, short, obtuse, simple or
branched; disc broad, plane, whltish-pruinose, proper margins
thin, elevated; hypothecium colourless, the apothecial walls
lateral only; paraphyses slender, sub discrete ; epithecium
blackish-brown; spores muriform, colourless, 35-48 [l- long,
12-20 [l- thick.-Graphis inusttda Ny!. in Flora Ix. 566 (1877);
Cromb. in Grevillea vi. 114; Leight. Lich. F!. ed. 3, 435.
Exsicc. Larb. Lich. Rb. without a number.
DIffers from the preceding spccies in the flat short pruinose apo·
the cia which somewhat resemble those of Phroograph!8 inusla.
Hab. On holly.-B. lIr Westport, Mayo.
3. Gr:Ruiziana Muel!. Arg. in Flora lxiii. 20 (1880).-Thallus
greyish-cream-coloured, thin, smooth, determmate or effuse,
sometimes limited by a black line. Apothecia black, prominent,
sessile or slightly immersed at the base, linear-oblong, rather short,
straight or subflexuose; usually simple; disc narrow, sometimes
slightly dilated; proper margins tumid, connivent; hypotheciu