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Form c alcig en a Nyl. ex Cromb. Jonrn. Bot. 1876, p. 361
(noraen) ; Leight. Lioh. Fl. ed. 3, p. 192.—Thallus determinate,
thiolier, areolato-diffract, greyish. Apotheoia livid, subpruinose, tbe
th allin e margin entire.
Differs in the characters given of the thallus and apothecia. I t is
probably a good variety, but has been seen too spariugly to decide.
Hab. Ou calcareous rocks in a maritime district.—Distr. Very local
and scarce in N.W. Ireland.—B.M. ; Lettermore, Connemara, co. Galway.
107. L. A g a rd liia n a Aoh. Syn. (1814) p. 1 5 2 ; Nyl. Lioh. Scand.
p. 138. Thallus effuse, th in , contiguous, smooth, opaque, d a rk -
greyish (K —, CaCl — ). Apothecia small, a t first innate, concave,
with whitish entire thalline margin, a t length sessile, convex, immarginate,
brownish-black, slightly pruinose or naked (epitheoium
HNo, rosaceous) ; spores ellipsoid, 0 ,0 1 0 -1 4 mm. long, 0 ,0 0 4 -5 mm.
thick ; paraphyses thickish, brownish a t the apices ; hymenial gelatine
bluish w ith iodine.—Cromb. Grevillea, xviii. p. 69.
A plant, according to Nylander in litt., allied to L. Hageni, though the
apothecia are at length lecideoid. In the few Bi'itish specimens the
thaUus is indistinct, so that they may be referred to a form ecrustacea
Cromb. The apothecia are numerous, though not crowded, and for the
most part epruinose. The spermogones are rarely present, with .spermatia
0,012-15 mm. long, 0,0005 mm. thick.
Hab. On calcareous rocks in a maritime district. Distr. As yet only
in N. Wales.—B. M. : Great Orme’s Head, Carnarvonshire.
108. L. prosechoides Nyl. Flora, 1872, p. 250.—Thallus de te rminate,
th innish, areolate-rimose, whitish or sordid-yellowish (K —,
CaCl — ). Apotheoia small or m oderate, plane, somewhat prominent,
brownish or blackish, th e th allin e margin su b en tire ; spores
ellipsoid or oblongo-ellipsoid, occasionally 1-septate, 0 ,0 0 8 -1 2 mm.
long, 0 ,0 0 4 5 -5 5 mm. thick ; paraphyses discrete, moderate or
thickish, brownish or yellowish-brown a t th e clavate apices ; hy menial
gelatine p e rsistently bluish w ith iodine.— Cromb. Grevillea,
iii. p. 82 .— Lecanora um b n n a subsp. prosechoides Nyl. in Cromb.
Lich. Brit. (1870), p. 51 ; iormaprosechoides L eight. Lich. F l. p. 208,
ed. 3, p. 191. To this fid e Nyl. in litt. is referable Lecanora
helicopis f. dilutior Nyl. Lich. Soand. p. 159, Carroll, Jo u rn . Bot.
1866, p. 23, Cromb. Licb. Brit. p. 50 ; also Parmelia subfusca var.
lainea F r. Lioh. Sueo. Exs. n. 371. Lecanora prosecha (non Ach.)
Leight. Lich. Fl. ed. 3, p. 224.—B r it. Exs. : Cromb. n. 67 ; Larb.
Lich. Hb. n. 94.
At first regarded as a subspecies of L. umbrina by Nylander, this
differs in the colour of the thallus and of the apothecia, in the form of
the spores, and in the reaction of the hymenial gelatine. The thallus,
though determinate, is at times somewhat expanded, and varies in colour,
being paler in shady situations. The apothecia are numerous, with the
thalFine margin occasionally at length obliterated. They are rarely the
host oi Arthonia varians (HaY.). The spermogones have the spermatia
arcuate, 0,022-23 mm. long, about 0,0005 mm. thick.
Hab. Ou schistose, very rarely cretaceous, rocks in maritime districts.
Distr. Local in the Channel Islands, S.W. and N.W. England, Wales,
the S.W. Highlands and N.E. Scotland, S. and N.E. Ireland.—B. M. :
Noirmont, Island of Jersey; Vale Bay, Island of Guernsey. Between
Porlock and Lynton, Devonshire; Penzance, Cornwall; Manorbeer, near
Tenby, Pembrokeshire ; Southerndown, Glamorganshire ; The Mowd-
doch and Barmouth, Merionethshire; Pwllheli, Carnarvonshire, Port
Soderick, Isle of Man. Loch Creran, Argylesliire; Portlethen, Kincardineshire.
Kilkee, co. Clare ; Ardglass, co. Down.
Form sublutior Nyl. Flora, 1882, p. 456.—Thallus as in the
type. Apotheoia pale-brownish.—Cromb. Grevillea, xix. p. 60
(lapsu s. n. dilutior).
Differs in the colour of the fruit, which probably arises from tiie habitat.
In tlie single British specimen the thalline margin of the apothecia is here
and there evanescent, so th at they then appear biatoroid.
Hab. On moist schistose rocks in a maritime district. Distr. Extremely
rare in N.E. Scotland.—B. M. : near Cove, Kincardineshire.
109. L. prosechoidiza Nyl. Flora, 1881, p. 3.—Thallus th in ,
areolato-diffract, greyish (K—, CaCl — ). Apotheoia moderate,
blackish or brownish-blaok, a t first w ith entire whitish thalline
margin, a t length convex and imm a rg in a te ; spores ellipsoid, 0 ,0 0 9 -
12 mm. long, 0 ,0 0 4 -6 mm. th ic k ; paraphyses ra th e r co h eren t;
hymenial gelatine bluish and th en (especially th e theoæ) violet or
subtawny w ith iodine.—Cromb. Journ. Bot. 1885, p. 195.
Approaches the preceding species, from which it differs more especially
m the less discrete paraphyses. Nylander, I. c., observes th at it is
probably to be regarded only as a subspecies of L. umhrina ; but from
this it a t once difiers in the colour of the apothecia. In the single
British specimen the thallus is indeterminate and the apothecia are
numerous. The spermogones are only here and there visible, with
spermatia 0,010-22 mm. long, 0,0005 mm. thick.
Ilab. On schistose roeks in a maritime district.—Distr. Extremely
local and scarce iu N.E. Scotland.—B. M. : near Portlethen, Kincardineshire.
110. I . confería Nyl. Ann. So. Nat. Bot. 1867, p. 314, n ota 1.
—Thallus effuse, tbin, granulato-unequal, greyish-white or greeni.sh-
• grey, often obsolete ( K - , C a C l- ) . Apothecia small, plane,
crowded, subangulose, testaceous or palo-testaceous, with th in
crenulate thalline margin, or frequently subbiatorine ; spores 0,009
—lo mm. long, 0,0045—55 mm. th ic k ) paraphyses submoderate,
brownish a t th e apices ; hymenial gelatine deep-bluish (the theoæ
dark-violet) with iodine.—Cromb. Grevillea, xviii. p. 69.— Lecanora
umbrina var. conferta Cromb. Jo u rn . Bot. 1870, p. 97. L . Hageni
var. conferta Leight. Lich. Fl. p. 208, ed. 3, p. 192. Patellaria
conferta Dub. Bot. Gall. ii. (1830) p. 664.