23. A. leptotera A. L. Sm.—Thallus dark-olivaceous-green,
somewhat gelatinous, smooth or cracked in drymg, subdeterminate.
Perithecia black, minute, subinnate ; peritheciai wall
dimidiate ; paraphyses breaking up or obsolete ; asci oblong,
ovate; spores oblong-clavate, 1-septate, the upper cell rather
thicker, colourless, 0,016-18 mm. long, 0,005 mm. thick.
Verrucaria leptotera Nyl. in Plora xlviii. p. 212 (1865).
Distinguished from A. litoralis by the subgelatinous thallus
and immersed apothecia.
Hah. On maritime rocks.—Dfsir. Kare in the Channel Islands.—
B. M. Grève-au-Lançon, Jersey.
24. A. halodytes Oliv. Exp. Syst. Lich. Prance ii. 2, p. 261
[1901),—Thallus olivaceous-brown or blackish, thin, continuous or
sparsely cracked, somewhat gelatinous. Perithecia small, black,
slightly prominent, becoming impressed above, numerous and
somewhat congregate, intermixed with spermogones ; peritheciai
wall dimidiate ; paraphyses few, irregular ; asci inflated ; spores
oblong, 1-septate, slightly thicker a t one end, 0,013-15 mm.
long, 0,005—7 thick. Verrucaria halodytes Nyl. in Mém. Soc.
Sci. Nat. Cherb. v. p. 142 (1857). V. fluctigena Nyl. in Flora
Iviii. p. 14 (1875) (fide Weddell in Mém. Soc. Sci. Nat. Cherb.
xix. p. 307 (1875)) ; Leight. Lich. Fl. ed. 3, p. 462.
Differs from the preceding in the more prominent perithecia and
in the shorter asci and spores. Nylander’s specimen from Cherbourg
is olivaoeous-green in colour. Weddell il. c.) describes the thallus as
brown or brownish-black ; he also adds a note on the algal symbiont,
which, according to Bornet, is Glæocapsa crepidinum. Thur., one of the
Phyooohromophyceæ. V. fluctigena has been referred by A. Zahlbruckner
(Krypt. exsicc. n. 469) as a synonym to A. Kelpii Koerb.
(Parerg. Lich. p. 387 (1868) ).
Hah. On maritime rocks, washed by the waves.—Specimen cited
by Leighton (I. c.) (under V. fluctigena) as from Crombie, but not
found in Herb. Crombie.
Var. Hollii A. L. Sm.—Thallus dull-black, widely spreading,
very minutely cracked-areolate. Perithecia as in the species.
The minute areolation, visible only with a high magnification,
gives the thallus a somewhat scabrid look. The specimen was
collected by H. B. Holl.
Hdb. On rooks near the sea.—Distr. Bare in W. Wales.—B. M.
On the road between Barmouth and Dolgelly, Merioneth.
25. A. halizoa A. L. Sm.—Thallus thin, effuse, continuous,
pale - olivaceous or sage-green. Perithecia minute, black,
scattered, prominent or semi-immersed ; peritheciai _ wall dimidiate
or subentire ; paraphyses scanty, distinct ; asci cylindrical
or slightly swollen ; spores oblong-ov'ate, colourless, 1-septate,
the upper cell sometimes larger, 0,010-12 mm. long, 0,005-7 mm.
thick ; hymenial gelatine yellow with iodine.— Verrucaria halizoa
Leight. Lich. PI. p. 436 (1871) ; ed. 3, p. 461.
Differs from A. leptotera in the thinner thallus, distinct paraphyses,
and smaller spores.
Hdb. On maritime rooks.—DisZr. Eare on the coast of S.W.
England and AVales, and E. Scotland.—R. M. Glevedon, Somerset;
Manorbeer Bay, North Cliff and Giltar Points, Tenby, Pembrokeshire.
26. A. viridula A. L. Sm.—Thallus effuse, thin, greenish-
olive, tartareous, smooth or slightly cracked. Perithecia immersed,
hemispherical, emerging, the ostiole umbilicate; peritheciai wall
dimidiate, spreading and incurved a t the base ; spores colourless,
linear-oblonl 1-septate, 0,017-19 mm. long, 0,006-7 mm. thick.
— Lichen viridulus Sm. Engl. Bot. t. 2455 (1812) pro parte.
Verrucaria elseina Borr. in Sm. Engl. Bot. under t. 2455, fig. 2
(1812) ; Hook, in Sm. Engl. Fl. v. p. 152 ; Leight. Angioc. Lich.
p. 63, t. 27, fig. 2 & Lich. PI. p. 436; ed. 3, p. 462. Thelidium
eleeinum Mudd Man. p. 296 (1861). Specimen not seen.
Perhaps identical with A. halizoa, to which the drawing in English
Botany bears a strong resemblance.
Hdb. On maritime slaty rooks.—Distr. Rare on the W. coast of
Wales and W. Ireland.
27. A. marina A. L. Sm.—Thallus dark-olive-green, subgelatinous,
smooth, determinate with a black line a t the circumference.
Perithecia minute, black, immersed in the thallus, the
ostiole rather flat or slightly depressed; peritheciai wall entire,
black ; paraphyses none ; spores 8 in the ascus, minute, ellipsoid-
oblong, colourless, 1-septate, becoming 3-septate at^ maturity,
0,009-14 mm. long, 0,003-5 mm. thick.—Sagedia marina Deakin
in Ann. & Mag. Nat. Hist. ser. 2, xiii. p. 40, t. 4, fig. 13 (1854).
Verrucaria marina Leight. Lioh. Fl. p. 446 (1871); ed. 3, p. 4/7 ;
Massee in Journ. Bot. xxx. p. 193, t. 324, fig. 8 (1892).
Similar to A. leptotera in appearance of thallus and perithecia,
but differing in the structure and size of the spores. AVeddell s
Verrucaria leptotera var. marmorans (Mem. Soo. Soi. Nat. Cherb. xix.
p. 309 (1875)) is probably identical with A. marina.
Hab. On maritime rooks below high tide.—RisZr. Eare in the
Channel Islands, S. England and E. and W. Scotland.—R. M. Greve-
au-Lanoon, Jersey; Torquay, Devon.
Growing on trees; spores 3-septate.
28. A. rhyponta Massal. Ric. Lich. p. 166 (1852).—Thallus
thin, subeffuse, dark-brown or blackish, forming dark-coloured
spots on the bark. Perithecia minute, hemispherical, semiimmersed,
b la c k ; peritheciai wall dimidiate; paraphyses almost
obsolete ; spores colourless or becoming slightly brownish, linear-
oblong, 3-septate, 0,018-22 mm. long, 0,004-5 mm. thick ; hymenial
gelatine red or yellow-brown with iodine.— Verrucaria rhyponta