Var. hysteriiformis Cromb. in Journ. Bot. xx. p. 276 (1882).—
Thallus greyish, thin or obsolete. Apothecia larger and more
prominent th an in the species, and the margins sometimes
furrowed ; spores colourless, 3-5-septate, 0,015-16 mm. long,
0,0035-40 mm. thick.—0. hysteriiformis Nyl. in Plora Ixii. p. 224
(1879) ; Cromb. in Grevillea viii. p. 30 (1879).
Hab. On rocks bj' the sea.—B.M. Kylemore, Connemara, Galway
(the only locality).
9. 0. grumulosa Duf. in Journ. Phys. Ixxxvii. p. 214 (1818).—
Thallus white, thick, farinaceous (Kf + yellow, CaCl + red).
Apothecia black, a t first immersed then sessile, ellipsoid,
roundish, elongate or angular ; disc bluish-pruinose ; margins
thin, prominent, persistent ; hypothecium thick, black ; paraphyses
thickish, shortly branched above and somewhat conglutinate
; spores colourless, oblong-fusiform, 3-septate, 0,015-
17 mm. long, 0,003-4 mm. thick.—Leight. Lich. IT. p. 380;
ed. 3, p. 403 & in Grevillea ii. p. 171, t. 26, f. 2 (1874).
Apt to be confused with Lecanactis Dilleniana, but with a much
thicker thallus, and more graphideine apothecia.
Hab. On rocks.—Distr. Bare in the Channel Islands and S.
England.—B. M. Near Eozel, Jersey ; Walls of Old Nunnery, Alderney
; Lynmouth, Devon ; I. of Portland, Dorset.
10. 0. nothiza Nyl. in Plora Ixxx. p. 13 (1880).—Thallus
greyish, thin and firm, cracked into small areolæ on a blackish
almost obsolete hypotballus. Apothecia black, oblong, roundish
■or angular ; disc plane, usually bluish-pruinose ; margins thin,
prominent, disappearing ; hypothecium thick, brownish-black ;
paraphyses thickish, shortly branched above and somewhat
■conglutinate; spores oblong, o-septate, colourless, 0,015-17 mm.
long, 0,003-4 min. thick.—Cromb. in Grevillea viii. p. 113 & in
Journ. Bot. xx. p. 276 (1882). 0. varia f. notha (saxicolous).
Leight. Lich. PI. p. 381 ; ed. 3, p. 404 (fide Larb. exsicc. n. 317).
Exsicc. Larb. Lich. Hb. n. 317 ; Lich. Cæsar. n. 91.
Perhaps only a growth form of the preceding which it strongly
resembles, differing chiefly in the thin grey areolate thallus and the
less distinctly pruinose apothecia.
Hab. On rocks.— Distr. Eare in the Channel Islands.— B. M.
La Coupe, East Coast, Jersey ; Moulin Huet Bay, Sark.
11. 0. calcarea Turn, in Sm.
Engl. Bot. t. 1790 (1807);
—Thallus white or yellowish,
and pulverulent. Apothecia
ed, flexuose and wavy, usually
masses, sometimes scattered,
; paraphyses crowded, slender,
with a thick wall a t the t i p ;
Ach. Lich. Univ. p. 250 (1810).-
tartareous, sometimes very thin
linear-elongate, black, simple, curv
conglomerate in small crowded
shining ; disc slit-like, ra th e r open
subdiscrete ; asci broadly clavate
spores somewhat clavate, colourless, sometimes becoming brownish,
3-septate, 0,014-18 mm. long, 0,004-6 mm. thick.—0. saxatilis
Fr. Lich. Fu r. p. 366 (1831), pro parte (non DO.) ; Hook, in Sm.
Engl. Fl. V, p. 145 pro parte ; Tayl. in Mackay Fl. Hib. ii. p. 106.
0. Chevallieri Leight. in Ann. Mag. Nat. Hist. ser. 2, xiii. p. 90,
t. 5, f. 4 (1854) (excl. syn.) ; Mudd Man. p. 228 (excl. syn.).
0. atra var. calcarea Stiz. in Nov. Act. Acad. Leop.-Carol.
xxxii. 4, p. 18, t. 1, f. 5, a -d (1865) ; Cromb. Lich. Brit. p>. 9 8 ;
var. Chevallieri Stiz. I. c. p. 20, t. 1, f. 5, t - z ; Cromb. I. c.
0. saxicola var. Chevallieri Leight. Lich. Fl. p. 379 ; ed. 3, p. 402.
Hysterina calcarea S. P. Gray Nat. Arr. i. p. 505 (1821).
Exsicc. Leight. nos. 67, 242 ; Mudd n. 203 ; Larb. Lich. Hb.
n. 275.
Differs from 0. confluens in the white and usually more developed
thallus, the more crowded and conglutínate paraphyses and the thick
apex of the ascus.
Hab. On rooks mostly calcareous or arenaceous, rarely on clay
soil.—Distr. General throughout the Channel Islands and England,
rarer in Scotland and Ireland.—B .M . St. Ouen’s Bay, Jersey;
Bodmin, Cornwall; Kingsbridge and Torquay, Devon; Ventnor, I. of
Wight; Ardingly, Hastings and Keymer Church, Sussex; near
Cirencester, Gloucestershire; Bathampton, Somerset; Hereford;
Leigh Court, Worcestershire ; Giltar Point, Tenby, Pembrokeshire;
Aberdovey, Merioneth; Holyhead, Anglesey; Great Orme’s Head,
Carnarvon; Castell-Dinas-Bran, Denbighshire; Parson Drove, Cambridgeshire
; Bay of Nigg, Kincardineshire; Kilbarrick Church, near
Dublin ; Eoss and Kilkee, Clare ; Glenarm, xkntrim.
Form heteromorpha A. L. Sm.—Thallus almost obsolete.
Apothecia more scattered th an in the species and the groups
smaller, ra th e r large and prominent, simple or sometimes
b ran ch ed ; internal structure similar.—Opegrapha atra var.
Chevallieri f. heteromorpha Stiz. tom. cit. p. 21, t. 1, f. 5, a-¿.
0. atra f. heteromorpha Cromb. Lich. Brit. p. 98 (1870). 0. saxicola
var. Chevallieri f. heteromorpha Leight. Lich. Fl. ed. 3, p. 402.
Exsicc. Larb. Lich. Hb. n. 77.
Hab. On maritime rocks.—Distr. Eare in the Channel Islands,
S. England, E. and W. Scotland and S. and W. Ireland.— B. M.
Port Moulin, Sark ; Noirmont, Jersey; Wembury, Devon ; Aberdovey,
Merioneth ; Bay of Nigg, Kincardineshire ; near Peterhead, Aberdeenshire
; Barcaldine, Argyll; Old Head of Kinsale, and Rostellan, Cork ;
Twelve Pins and Killery, Connemara, Galway.
12. 0. confluens Stiz. in Flora xlviii. p. 75 (1865).—Thallus
greyish-green, effuse, thin or wanting. Apothecia usually
grouped in little masses, rarely solitary and scattered; sessile
simple, rather thick, cylindrical, straight or curved and contorted ;
disc slit-like, becoming somewhat open, the margins rounded,
inflexed, becoming a c u te ; paraphyses discrete, slightly swollen
and brown a t the tips ; spores colourless, elongate-ovate, 3-septate,