348 LICHENACEL. [LEPROLOMA. 
59. LEPROLOMA Nyl. Flora, 1883, p. 107.—Thallus mono- 
phyllo-lobate, submembranaceous, soft, pulverulent on the surface, 
containing gonidia. Apothecia and spermogones unknown. 
A pseudo-genus separated by Nylander from Amphiloma (now restricted 
to exotic species) on account of the thallus being leprarioid and always 
sterile. Indeed in Lich. Scand. p. 129, he had aad. in regard to the single 
species of which it consists, “it is possible that our lichen may be a de- 
graded state of a type which we do not yet know.” In the absence of 
fructification, its systematic place is quite uncertain. 
1. L. lanuginosam Nyl. 7. ¢—Thallus orbicular or subeffuse, 
grapuloso-pulverulent in the centre, white or yellowish-white, lobes 
subimbricate, adpresso-adnate (K —); hypothallus tomentose, 
bluish-black.—Cromb. Grevillea, xviii. p. 44.—Amphiloma lanugi- 
nosum Mudd, Man. p. 126; Cromb. Lich. Brit. p. 44; Leight. Lich. 
Fl. p. 170, ed. 3, p.156. Squamaria lanuginosa Sm. Eng. Fl. v. 
p. 53. Parmelia lanuginosa Hook. FI. Scot. ii. p. 53; Gray, Nat. 
Arr. i. p. 439; Tayl. in Mack. Fl. Hib. ti. p. 148. Lechen lanugi- 
nosus Ach. Prodr. (1798) p.120. Lichen membranaceus Dicks. Crypt. 
fase. ii. p. 21,t. 6.f.1; With. Arr, iv. p. 61.—Brit. Hws.: Leight. 
n. 55; Larb. Lich. Hb. n. 332. 
The thallus, which is moderate, or at times somewhat expanded, is 
occasionally granuloso-pulverulent almost throughout, so that the lobes 
are nearly obliterated. It is never seen except sterile, though apothecia 
have been described both by Dickson and Acharius; by the former as 
being “ few, minute, pale-yellow,” and by the latter as ‘‘ minute, reddish, 
with pulverulent margin.” Apart from the discrepancy as to colour, these 
evidently were not the true fructification. 
Hab. On decayed mosses on shaded rocks, chiefly granitic and schistose, 
in maritime and upland situations— Distr. General and not uncommon 
in the mountainous tracts of Great Britain and probably also of Ireland ; 
rare in the Channel Islands—B.M.: Rozel, Island of Jersey; Island of 
Guernsey. Lustleigh Cleeve, 5. Devon; Roche Rock, Cornwall ; Bardon 
Hill, Leicestershire; Malvern, Worcestershire; Longmynd Hill and 
Stiperstones, Shropshire; Barmouth, Merionethshire; Falcon Clints, 
Durham; Kentmere, Westmoreland; Wastdale, Cumberland. Black 
Craig, New Galloway, Kirkcudbrightshire; Ben Lomond, Dumbarton- 
shire ; Achrosagan Hill, Appin ; The Trossachs and Craig Calliach, Perth- 
shire ; Canlochan, Fortfarshire; Craig Cluny, Braemar, Aberdeenshire ; 
Glen Nevis, Inverness-shire ; near Lairg, Sutherlandshire. Bonane, near 
Dunkerron, co. Kerry. 
60. LECANORA Ach. Lich. Univ. (1810) p. 77; Nyl. emend. Not. 
Sallsk. pro F. et Fl. F. Forh. v. (1866) p. 125.—Thallus radiato- 
laciniate, squamulose, granulose, rarely leprose or evanescent. Apo- 
thecia lecanorine, occasionally biatoroid; spores usually 8nz, 
seldom numerous, ellipsoid or oblong, rarely fusiform, simple or 
sometimes locular or septate, usually colourless ; hymenial gelatine 
variously tinged with iodine. Spermogones with jointed, rarely | 
simple sterigmata and various spermatia. 
