448 LICHENACET. [LFCANORA. 
140. L. syringea Ach. Vet. Ak. Handl. 1810, p.75; Lich. Univ. 
p. 368.—Thallus effuse, very thin, or scarcely any visible, glaucous 
or greyish-white (K—, CaCi—). Apothecia small, sessile, at first 
plane with thin, entire thalline margin, then convex and immargi- 
nate, brownish or brownish-black, naked, or slightly casio-pruinose ; 
paraphyses not discrete, brownish at the apices; spores 8-l6nx, 
oblong, or elliptico-oblong, obtuse at the apices (1)—3-septate, usually 
somewhat curved, 0,012-16 mm. long, 0,004-6 mm. thick ; hyme- 
nial gelatine bluish, then wine-red or violet with iodine——Cromb. 
Grevillea, xviii. p. 78.—Parmelia Hageni §. syringea Ach. Meth. 
(1808) p. 168. Lecanora athroocarpa Dub. Cromb. Lich. Brit. p. 53 
pro parte ; Leight. Lich. Fl. p. 231 pro parte, ed. 3, p. 223 pro 
parte. L. athroocarpa var. fuscella (Schaer), Cromb, Lich. Brit. 
l.¢.; Leight. Lich. Fl. p. 232, ed. 3, Lc. Lecania fuscella Mudd, 
Man, p. 140 (corticola), t. ii. f. 45. ~ 
Though the specific name of Acharius is more circumscribed and refers 
rather to a form of L. athrovcarpa Dub. (Bot. Gall. ii. p. 669), it 
may on the ground of priority -be retained. The plant is somewhat 
variable, at times not unlike Z. Hagen’ and again resembling some 
Lecidea near L. vernalis, according to the character of the apotnecia. 
These are often crowded, and are then more or Jess biatoroid. 
Hab. On the trunks and branches of trees, chiefly poplar and maple, 
in maritime and upland tracts.—Distr. Only very sparingly in 8. and We 
England.—B. M.: Near Brading, Isle of Wight; Glynde, Sussex ; Brocken- 
hurst and near Stoney Cross, New Forest, Hants; Isham, near Torquay,. 
S. Devon; near the Beck, Malvern, Worcestershire. 
Form metabolica Nyl. Lich. Scand. (1861) p. 169 (sub L. athroo- 
carpa).—Thallus very thin, whitish or greyish-white. Apothecia 
minute, biatorine, dark-brown or nearly black.—JL. athroocaurpa 
var. metabolica Cromb. Lich. Brit. p. 53; Leight. Lich. Fl. p. 232, 
ed. 3, p. 224. Lecanora metabolica Ach. Lich. Univ. (1810) p. 351. 
Only a form with smaller, darker, more constantly biatorine apothecia. 
These in our specimens are also more scattered than in the type, with 
which probably it is confluent. 
Hab, On trunks and branches of maple in maritime districts.— Distr. 
Extremely local in the Channel Islands and 8. England—B. M.: 
Trinity, Island of Jersey. Brading, Isle of Wight. - 
141. L. Nylanderiana Nyl. ex Norrl. Sillsk. pro F. et Fl. Fenn. 
i. (1876) p. 24.—Thallus effuse, granulato-unequal, rimoso-areolate, 
sordid-greyish-white (K—, CaCl—). Apothecia submoderate, at 
first plane with thin thalline margin, at length convex and often 
immarginate, brown or brownish-black, glauco-pruinose or occa- 
sionally naked; spores 8nx, 3-septate, oblong or subfusiform,. 
straight (very rarely slightly curved), 0,014-20 mm. long, 0,0045 
mm. thick; paraphyses jointed, brownish at the thickened apices ; 
hymenial gelatine bluish, then wine-red with iodine.—Lecania 
Nylanderiana Mass. Sched. crit. (1855) p. 152. L. ceerulescens 
Mudd, Man. p. 140, t. 2. f. 46. Lecanora athroocarpa form ceru- 
