t. 1711 (1807) (non Ach.). Lithocia Schraderi S. F. Gray Nat.
Arr. i. p. 497 (1821).
The perithecia are thickly scattered over the stone and tend to
grow in concentric lines. There are also present on the surface of the
stone small groups of Verrucaria Dufourii, probably the “ male
scattered warts ” of Smith’s description.
Hdb. On chalk or calcareous stones.—B. M. Sussex (the only
locality); specimen collected by AV. Borrer.
5. P. deminuta Am. in Flora xliv. p. 264 (1861).—Thallus
greyish-white, thin, tartareous. Perithecia globose, minute, black,
entirely immersed, leaving pics in the rock, the ostiole slightly
prominent; peritheciai wall e n tire ; paraphyses n o n e ; spores 8,
colourless then brown, ellipsoid or broadly oblong, muriform,
0,022-30 mm. long, 0,012-15 mm. thick.— Verrucaria deminuta
Cromb. in Journ. Bot. xiv. p. 363 (1876); Leight. Lich. Fl. ed. 3,
p. 491.
This and the preceding are the only British species of Polyblastia
that form peritheciai pits (foveolate) in the substratum.
Hab. On moist rocks.—E. M. Eecess Road, Connemara, Galway.
6. P. inumbrata A. L. Sm .-T h a llu s dark-brownish or,greyish,
thiu, effuse, unequal or dispersed. Perithecia moderate in size,
semi-immersed, the ostiole projecting, generally with a minute
p ap illa ; peritheciai wall thick, black, e n tire ; paraphyses mucilaginous,
disappearing; spores 8 in the ascus, oblong-ellipsoid,
lighL yellowish-brown, muriform, large, 0,33-62 mm. long,
0,017-32 mm. th ic k ; hymenial gelatine wine-red with iodine,—
Verrucaria inumbrata Nyl. in Flora xlvii. p. 355 (1864) ; Carroll
in Journ. Bot. iii. p. 292 (1865); Cromb. Lich. Brit.’ p. 114-
Leight. Lich. Fl. p. 460; ed. 3, p. 492.
Nylander describes the spores as colourless, but in the authentic
specimens examined they are a clear light-brown with very distinct
1-3 transverse septa and muriform with small cells.
Hab. On schistose rocks.—E. M. Ben Lawers (the only locality).
7. P. subviridicans A, L. Sm.—Thallus pale-greenish, thin,
continuous and wrinkled. Perithecia black, embedded in large
thalline tubercles, the ostiole papillate, small, depressed; peri-
thecial wall dimidiate; paraphyses n o n e ; spores 2 or 4 in the
ascus, oblong, colourless, muriform, large, 0,046-70 mm. long,
0,024-30 mm. thick.— Ferrwcaria subviridicans Nyl. in Plora Ix!
p. 566 (1877); Cromb. in Grevillea vi. p. 114; Leight. Lich. Fl.
ed. 3, p. 488. Specimen not seen.
Considered by Nylander to be very like the preceding, of which it
may be a subspecies. He also states that the thallus contains blue-
green alg® (gonimiose); that may however be accidental, and due to
the moist habitat.
Hab. On stones in torrents, rare in W. Ireland, near Kylemore
Connemara, Galway.
8. p. subinumbrata A. L. Sm.—Thallus greyish-brown, very
thin or subevanescent. Perithecia immersed in brownish thalline
w a rts ; peritheciai wall black, entire ; spores similar to those of
P . inumbrata but smaller, 0,022-30 mm. long, 0,015-18 mm.
thick.— Verrucaria subinumbrata Nyl. in Flora Ixi. p. 246 (1878) ;
Cromb. in Grevillea vii. p. 97 ; Leight. Lich. Fl. ed. 3, p. 492.
Perhaps only a subspecies of P. inumbrata (Nyl. I. c.). The
specimen in the herbarium of the British Museum collected by
Larbalestier at the same locality is a form of P. sootinospora with
small, very dark, muriform spores.
Hab. On schistose rocks, Kylemore, Connemara, Galway (the only
locality).
9. P. Sendtneri Krempelh. in Flora xxxviii. p. 67 (1855).—
Thallus whitish-grey, cartilaginous, incrusting, granular, unequal.
Perithecia black, minute, globose, semi-immersed, the ostiohi
depressed; peritheciai wall e n tire ; paraphyses mucilaginous,
disappearing ; spores 8 in the ascus, almost colourless or pallid-
brownish, ovoid, muriform, 0,015-30 mm. long, 0,009-014 mm.
th ic k ; hymenial gelatine wine-red with iodine.— Verrucaria
Sendtneri Nyl. in Maine et Loire. Mém. Soc. Acad. iv. p. 33
(1858); Carroll in Journ. Bot. iii. p. 292 (1865); Leight. Lich.
Fl. p. 459; ed. 3, p. 490.
The colour of the spores seems to vary a great deal, some authors
describing them as brownish, in the specimens examined they are
almost colourless.
Hab. On mossy earth in alpine regions.—E. M. Ben Lawers,
Perthshire.
10. P. gelatinosa Th. Fr. in K. Svensk. Vetensk. Soc. Nov.
Act. 1877, 8, p. 10.—Thallus thinnish, effuse, somewhat gelatinous,
dark-brownish or blackish. Perithecia moderate in size, semiimmersed,
somewhat prominent, the ostiole slightly depressed;
peritheciai wall en tire ; paraphyses mucilaginous, disappearing,
ostiolar filaments numerous, d is tin c t; asci saccate-clavate ; spores
8 in the ascus, oblong-ellipsoid, pale-brownish or almost colourless,
muriform, 0,030-45 mm. long, 0,012-21 mm. thick.— Verrucaria
gelatinosa Ach. Lich. Univ. p. 283 (1810) (non Nyl. in Maine et
Loire Mém. Soc. Acad. iv. p. 21 (1858)). V. nigrata Nyl. in
Act. Soc. Linn. Bord. sér. 3, i. p. 430 (1856); Cromb. Lich. Brit,
p. 110; Leight. Lich. Fl. p. 456 ; ed. 3, p. 489. Sphseromphale
nigrata Mudd Man. p. 282 (1861).
Leighton has described the spores as dark-brown, but Nylander
includes the species in a section with colourless spores. In the
speoimeus examined they are colourless or slightly brownish.
Hab. On mossy earth in alpine places.—E. M. Ben Lawers (the
only British locality).