BRITISH LICHENS

GYALECTA GYALECTACElE 9
tate, 58-80 (.L long, 3-4 (.L thick; hymenial gelatine pale-bluish
with iodine.-Lichen corneus With. Arr. ed. 3, iv. 20, t. 31. f. 3
(1796) (non herb.); Eng!. Bot. t. 965; Leight. Angioc. Lich. 86,
t. xiv. f. 4. Lecidea carneola Ach. Lich. Univ. 194, t. 2. f. 7 (1810);
Ny!. Lich. Scand. 191; S. F. Gray Nat. Arr. i. 472; Carroll in
Journ. Bot. vi. 100 (1868); Cromb. Lich. Brit. 63; Leight. Lich.
F!. 34; ed. 3, 367. L. cornea Hook. in Sm. Eng!. F!. v. 183
(1833); Tayl. in Mackay Fl. Hib. ii. 128. Bacidia carneola
Koerb. Syst. Lich. Germ. 186 (1855); Mudd Man. ] 82. The
description and fig. of Withering correspond with this plant,
though the specimens in his herbarium belong to a different
species, Biatorina Griffitlni Massa!. (cf. Grevillea xii. 59).
Exsicc. J.Jeight. n. 117 ; Johns. n. 330.
This species has been placed under the genus Pachyphiale Lonnr.
by various lichenologists. It is well characterized by the form, septa·
tion and size of the spores, which readily distinguish it from all the
allied species. The apothecia, somewhat scattered. are semitransparent,
and become in age less concave, with the margin darker. At
times the whole plant is more or less infested by a reddish Trentepohlia.
A plant corresponding WIth this in the form and septation of the
spores is Lecidea chrysophrxa Ny!. in Act. Soc. Linn. Bord. ser. 3, i.
438 (1856); but this is doubtfully British.
Hab. On smooth bark of trees in wooded maritime and upland
districts.-Distr. Somewhat rare in England and Wales; rare in S.W.
Ireland; not seen from Scotland or the Channel Islands.-B. M.
Near Ryde, Isle of Wight; Lyndhurst, New Forest, Hants; Lustleigh,
Devon; Ashdown Forest, Tilgate, and Eridgo Park, Sussex; near Colesborne,
Gloucestershire; Twycross, Leicestershire; Barmouth, lVferioneth;
Trefriw, Gam and Gwdir, DenbIghshire; Haughmond HIll, Shropshire;
Egglestono and Teesdale, Durham; Levens Park, Westmorland;
Keswick, Cumberland; Dinis, Killarney, Kerry.
11. G. corticola A. L. Sm.-Thallus effuse, very thin, sordidgreenish
(K -, CaCI -), often evanescent. Apothecia minute,
concav.e, at length slightly prominent, pale-red or somewhat
brick-red, the margin subconcolorous; paraphyses slender;
hypothecium colourless: spores 24-32 in the ascus, fusiform,
3-7-septate, 16-34 (.L long, 5-7 (.L thick; hymenial gelatine palebluish
with iodine.-Pachyphiale corticola Lonnr. in Flora xli.
612 (1858). Lecidea congruella Nyl. Lich. Scand. 191 (1861);
Cromb. in Grevlllea xxii. 8.
Externally somewhat similar to G. truncigena, but distinct in the
number, septation and form of the spores. In the single British
specimen gathered, which is only sparingly fertile, the thallus is but
little visible (fide Crombie).
Hab. On trunk of pine in wooded mountainous district. Recorded
by Crombie from Craig Calliach Killin, Perthshire.
o § iii. MICROPIIIALE Wain. Lich. Bresil. ii. 70 (1890). Algal
cells Trentepohlia. Apothecia with entire proper margin; spores
I-septate, similar to spores of Biatorina, under which genus the
species were formerly classified (see ed. I, 13).