412 LICHENACEI. [LECANORA. 
Distr. Extremely rare on one of the S. Grampians, Scotland —B. M.: 
Ben Lawers, Perthshire. 
90. L. Parisiensis Nyl. Bull. Soc. Bot. t. xiii. (1866) p. 368.— 
Thallus determinate or subdeterminate, rugose or rugoso-granulate 
or subverrucose, greyish (K+ yellowish, CaC1—). Apothecia mode- 
rate, plane, brownish-black or rarely brown, naked or occasionally 
cesio-pruinose; the thalline margin rugose or subcrenate; para- 
physes distinctly articulate, slightly thickened and brownish at the 
apices ; spores 0,010-18 mm. long, 0,006-8 mm. thick; hymenial 
gelatine bluish (the thece at length violet) with iodine.—Cromb. 
Journ. Bot. 1871, p. 178.—Lecanora subfusca forma Parisiensis 
Leight. Lich. Fl. p. 201, ed. 3, p. 185.—In Flora, 1883, p. 107, 
Nylander says that Lecanora subfusca 6. horiza Ach. Lich. Univ. 
(1810) p. 394, belongs pro parte (i. ¢. the French specimen) to this 
species, so that probably it ought to be called L. horiza (Ach.) 
Nyl.— Brit. Evs.: Leight. n. 116 pro parte; Larb. Lich. Hb. 
n. 58, 
Distinguished from its more immediate British allies by the jointed 
paraphyses. At times the thallus is small and distinctly limited by a 
white hypothallus, and is then probably the var. horiza Ach. The apo- 
thecia occasionally are partly conglomerate, smaller, with the thalline 
margin subevanescent, a state which may be L. subfusca e. rufa Ach, Syn. 
p. 157. The spermogones (fide Nyl. in ltt.) have the spermatia 0,018- 
28 mm. long. 
Hab. On trunks of trees, seldom on old pales, in maritime and upland 
tracts.— Distr. Not unfrequent in England; rare in 8. Ireland; not seen 
from Scotland or the Channel Islands.—B.M.: Walthamstow, Essex ; 
Glynde, Sussex; New Forest, Hants; near Shanklin, Isle of Wight; 
Tisham, Torquay, and near Bovey Tracey, 8. Devon; Cherry Hinton, 
Cambridgeshire ; Gopsall Park, Leicestershire; Barmouth, Merioneth- 
shire ; near Shrewsbury, Shropshire ; near Ayton, Cleveland, Yorkshire, 
Tullygreen, co. Cork. 
91. L. rugosa Nyl. Flora, 1872, p. 250, nota 2.—Thallus deter- 
winate, thickish, granulato-rugose, whitish (K + yellowish, CaCl—). 
Apothecia moderate or somewhat large, at first concave, then plane, 
pale or brownish, sometimes slightly pruinose ; the thalline margin 
thick, elevated, rugose or rugoso-crenate and inflexed; paraphyses. 
crowded, colourless; epithecium granulose; spores 0,010-18 mm. 
long, 0,007-10 mm. thick; hymenial gelatine bluish, then wine-red 
with iodine—Cromb. Grevillea, xviii. p. 68.—LZ. subfuscw form 
rugosa Cromb, Lich. Brit. p. 51; Leight. Lich. Fl. p. 201, ed. 3, 
p. 186. Lichen rugosus Pers. fide Ach. Lich, Univ. (1810) p. 894 
(sub L. subfusca 6. horiza), L. subfusca e. atrynea Mudd, Man. 
p- 147 pro parte. 
May be recognized in its more ie state by the character of the 
thalline margin of the apothecia, which, with the granulose epithecium, 
readily distinguish it from the preceding corticolous species. The apo- 
thecia ure at times crowded and angulosc, and when also subpruinose 
