fusiform, 7-septate, 0,032 mm. long, 0,006 mm. thick ; spermogones
with arcuate spermatia.—Leight. Lich. Fl. p. 409.
Exsicc. Larb. Lich. Hb. n. 191.
Somewhat similar to the following in the form and septation of
the spores, but differing in the thallus and in the constantly minute
apothecia.
Hab. On rocks.—Distr. Eare in W. Ireland.—B. M. Lough Muck,
Connemara, Galway.
23. 0. Leightonii Cromb. ex Leight. Lich. Fl. p. 385 (1871).
—Thallus effuse, varying in thickness, pulverulent, greyish-green
or chalky-white, sometimes wanting. Apothecia prominent,
linear-elliptical, usually ra th e r long and stout, straight or
flexuose, simple or occasionally fo rk ed ; disc becoming somewhat
expanded and naked or greyish-pruinose; margins a t first thick
and elevated, becoming th in n e r; spores subclavate, fusiform,
colourless, sometimes becoming brownish, straight or bent,
5-7-septate, usually 6-septate, the central cell somewhat larger,
0,025-31 mm. long, 0,005-6 mm. thick.—Leight. op. cit. ed. 3,
p. 409. 0. saxatilis Leight. in Ann. Mag. Nat. Hist. ser. 2,
xiii. p. 89, t. 5, f. 3 (1854) (excl. syn.) (non DC.); Mudd Man.
p. 227 (excl. syn.).
Exsicc. Mudd n. 202.
Easily distinguished by the form and septation of the spores.
When well-developed, it is one of our most beautiful species, the
prominent black fruits being in striking contrast with the light
coloured thallus. The apothecia are sometimes few and scattered or
numerous and lying in all directions, often arranged in a substellate
manner.
Hab. On calcareous and sandstone rooks.—Distr. Eather uncommon
throughout England, rare in Ireland, not yet recorded for
Scotland.—B. M. Saltash, Oornwall; Ilsham, Torquay, Devon;
Fulking, Sussex; Duntisborne and Barnsly Park, Gloucestershire;
Netley Abbey, Hants ; Doimington Castle, Berks ; The Bartons near
Ledbury, Herefordshire; Bartlow Church, Essex; Aberdovey,
Merioneth; Earl’s Barton, Northamptonshire; Newton Wood, Cleveland,
Yorkshire; Killarney, Kerry.
Spores 7- to multi-septate.
24. 0. lyncea Borr. ex Hook, in Sm. Fngl. Fl. v. p. 144 (1833).
—Thallus white, tartareous, pulverulent, unequal. Apothecia
black, immersed, oblong or linear-oblong, short or elongate,
simple, curved, the disc open, plane, bluish-grey-pruinose;
margins stout, elevated, w av y ; paraphyses in d istin c t; spores
elongate-fusiform, colourless, about 7-septate, 0,022-30 mm. long,
0,004 mm. th ic k ; spermogones with oblong spermatia 0,004 mm.
long, 0,001 mm. thick.—Mudd Man. p. 229; Cromb. Lich. Brit,
p. 100; Leight. Lich. Fl. p. 386 ; ed. 3, p. 409. Lichen lynceus
Sm. Fngl. Bot. t. 809 (1800). Arthonia lyncea S. P. Gray Nat.
Arr. i. p. 479 (1821). Lecanactis lyncea Fsehw. Syst. Lich.
p. 14, f. 7 (1824); Fr. Lich. Fur. p. 375 (1831). Leight. in
Ann. Mag. Nat. Hist. ser. 2, xiii. p. 391 (1854).
Exsicc. Leight. n. 195; Mudd ii. 204; Larh. Lich. Hh
n. 111.
Easily recognized by the whitish thallus which sometimes spreads
over large patches of the bark, and by tbe grey-pruinose apothecia.
These are occasionally attacked by a fungus which changes them into
a disintegrated blackish mass. This condition (Spiloma versicolor,
Sm. Engl. Bot. t. 2076, S. variolosum t. 2077 (1809) ? Turn. & Borr.
Lioh. Brit. p. 85 (1839) & 8. nigrum pro parte ?) was named by
Eries O. lyncea var. spilomatica (Lich. Eur. p. 376), and later by
Nylander Spilomium graphideorum (in Act. Soo. Linn. Bord. sér. 8, i.
p. 898 (1856)).
Hab. On old oaks.—DisZr. Eather rare in the Channel Islands and
England.—B. M. Brockenhurst, New Forest, Hants; near Glynde,
Danny, Hurstpierpoint ; Parham Park, Sussex ; Holmwood, Surrey ;
Thorndon Hall, Gosfield Hall, and Epping Forest, Hainault Forest,
Essex; Penshurst, Kent; Tickworth Park and Dennington Park,
Suffolk; Sherwood Forest, Nottinghamshire; Purton, Wiltshire;
Donnmgton Park, Leicestershire; Haughmond Hill, Shropshire;
Hoggarts Wood, Ingleby, Cleveland, Yorkshire.
25. 0. prosodea Ach. Meth. p. 22 (1803).—Thailus
effuse, thickish, membranaceous, dull-pallid-brownish. Apothecia
prominent, stout, subcylindrical, somewhat shining, straight ;
disc narrow ; margins elevated, connivent ; paraphyses distinct ;
spores elongate-fusiform, colourless, up to 17-septate, about
0,050-60 mm. or more long, 0,006 mm. th ic k ; spermogones
rod-shaped 0,005-6 mm. long, 0,007 mm. thick.—Nyl. in Prodr.
Fl. N. Gran. p. 568 ; Cromb. Lich. Brit. p. 99 ; Leight. Lich. Fl.
p. 387; ed. 3, p. 410.
Exsicc. Larb. Cæsar. n. 92.
Hab. Cn bark of trees.—BZsZr. Eare in Channel Islands and
S. England.—B. M. Ann Port and St. Peter’s Valley, Jersey ; Newton
Bushell, Devon; New Forest, Hants; Shiere, Surrey.
26. 0. viridis Pers. ex Ach. Meth. p. 22 (1803).—Thallus
pale-yellowish or brownish, thin, somewhat vaguely limited.
Apothecia innate or sessile, oblong or linear, rounded, straight
or curved mostly simple; disc narrow, uniform, the margins
rounded, inflexed ; spores elongate-acicular or narrowly fusiform,
up to 15-septate, colourless, 0,040-80 mm. long, 0,006—7 mm.
th ic k ; spermogones with arcuate spermatia 0,014-16 mm. long,
0,0005 mm. thick.—Cromb. Lich. Brit. p. 100; Leight. Lich. Fl.
p. 387 ; ed. 3, p. 410. 0. siderella Leight. in Ann. Mag. Nat.
Hist. ser. 2, xiii. p. 209, t. 6. f. 14 (1854) (non Ach. ?). 0. rubella
Mudd Man. p. 233, t. 4, f. 90 (1861) (non Pers.?).
Exsicc. Mudd n. 213 (as 0. rubella).
Distinguished from the preceding by the thinner thallus and the
smaller and more slender apothecia.