59. LEPROLOMA Nyl. Plora, 1883, p. 107.—Thallus mono-
phyllo-lobate, submembranaceous, soft, pulverulent on th e surface,
containing gonidia. Apotheoia and spermogones unknown.
A pseudo-genus separated by Nylander from Amphiloma (now restricted
to exotic species) on account of the thallus hun g leprarioid and always
sterile. Indeed in Lich. Scand. p. 120, lie had said in regard to the single
species of which it consists, “ it is pos,sible th at our lichen may he a degraded
state of a type which we do not yet know.” In tlie absence of
fructification, its systematic place is quite luicertaiu.
1. L. lanuginosam Nyl. I. c.—Thallus orbicular or subeffuse,
granuloso-]mlverulent in the centre, white or yellowish-white, lobes
subimhricate, adpresso-adnate (K —) ; hypothallus tomentose,
bluish-black.—Cromb. Grevillea, xviii. p. 4 4.— Amphiloma lanugi-
nosiim Mudd, Man. p. 126 ; Cromh. Lioh. Brit. p. 44 ; Leight. Lich.
PI. p. 170, ed. 3, p. 156. Squamaria lanuginosa Sm, Eng. El. v.
p. 53. Parmelia lanuginosa Hook. FL Scot. ii. p. 5 3 ; Gray, Nat.
Arr. i. p. 439 ; Tayl. in Mack. Fl. Hib. ii. p. 148. Lichen lanugi-
nosus Aeh. Prodr. (Í 798) p. 120. Lichen membranáceas Dicks. Crypt,
fasc. ii. p. 2 1 ,t. 6. f. 1 ; With. Arr. iv. p. 61.—B rit. E xs .: 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 tliat the lohes
are nearly obliterated. I t is never seen except sterile, though apothecia
have been described both by Dickson and Acharius; by tlie former as
being “ few, minute, pale-yellow,” and by the latter as “ minute, reddish,
with pulverulent margin.” A part from the discrepancy as to colour, these
evidently were not the true fructification.
Hab. On decayed mosses on shaded rocks, chiefiy granitic and schistose,
in maritime and upland situations.—Dtstr. 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, S. Devon ; Roche Rock, Oornwall; Bardon
Hill, Leicestershire; Malvern, Worcestersliire; Longmynd Hill and
Stiperstones, Shropshire ; Barmouth, Merionethshire ; Falcon Clints,
Durham ; Kentmere, AA’estmoreland ; AA’astdale, Cumherland. Black
Craig, New GaUoway, Kirkcudbrightshire; Ben Lomond, Dumbartonshire
; Achrosagan Hill, Appin ; The Trossacbs and Craig Calliach, Pertli-
shire; Canlocban, Forfarshire; Craig Cluny, Braeniar, Aberdeenshire;
Glen Nevis, Inverness-shire ; near Lairg, Sutherlandshire. Bonane, near
Dunkerron, co. Kerry.
60. LECANORA Ach. Lich. Univ. (1810) p. 7 7 ; Nyl. emend. Not.
Sallsk. pro F. et F l. F. Forh. v. (1866) p. 125.—Ih a llu s radiato-
laciniate, squamulose, granulose, rarely leprose or evanescent. Apothecia
lecanorine, occasionally biatoroid ; spores usually 8nse,
seldom numerous, ellipsoid or oblong, ra re ly fusiform, simple or
sometimes looular or septate, usually colourless ; hymenial gelatine
variously tinged with iodiue. Spiermogones with jointed, rarely
simple sterigmata and various spermatia.
A large genus comprising several suhgenera, formerly ranking as
distinct genera, hut not sufficiently differing to warrant this arrangement.
Indeed, so intimately are they related that Nylander seems at times inclined
to regard them as only leading sections. Some of these with hia-
torold apothecia have sometimes been arranged under the Lecideei ; but
in most cases the apothecia are, at least in a young state, lecanorine, with
the margin containing gonidia. In other instances the character of the
spermogones indicates their true relation.
Subgenus 1. PSOROMA Nyl. Not. Sallsk. pro F . et Fl. F . Forh.
V. (1886) p. 125.—Thallus squamulose or subgranulose, internally
cellular. Apothecia leoanorine ; spores 8næ, ellipsoid, simple ;
hymenial gelatine bluish, th en wine-red with iodine. Spermogones
with jointed sterigmata and short cylindrioal spermatia slightly
thickened a t either apex.— Psoroma Aoh. Prodr, (1798) p. 91 pro
minima parte ; Nyl. Mém. Soo. Cherb. iii. (1885) p. 322.
At once distinguished hy the entirely cellular structure of the thallus.
Most of the species are exotic, and of the few which are European, only
one occurs in this country.
ooqF o£ oo'^ F F o^
n fl qOÙ
Fig. 58.
Lecanora (Psoroma) hypnonim Ach.—«. A’ertical section of thallus, x200,
h. Spores, x500. c. Sterigmata and spermatia, XoOO.
1. L. hypnornm Aoh. Syn. (1814) p. 1 9 3 ; Nyl. Not. Sallsk. pro
F . et Fl. F . Forh. v. (1866) p. 125.—Thallus indeterminate, sqna-
muloso-granulate, yellowish-brown or tawny-yellow ; squamules
minute, crenate or granulate (K—). Apothecia moderate or somewha
t large, a t first urceolate, then plane, red or brownish, the th alline
margin graniiloso-crenate ; spores often somewhat acute a t
eith e r apex, 0,0 1 6 -2 1 mm. long, 0 ,0 0 8 -1 1 mm. th ic k ; hymenial
gelatine bluish, then wine-red w ith iodine.—Cromb. Grevillea, xii.
p. 60 ; Hook. Fl. Scot. ii. p. 51 ; Tayl. in Alack. Fl. Hib. ii. p. 139.
1
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