BRITISH LICHENS
BRITISH LICHENS
BRITISH LICHENS
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
LECIDEA LECIDEACELE 77<br />
In the Br;tish specimens the thallus is either rather scattered (form<br />
dispersa Arnold III Flora h. 35 (1868)), or more commonly scarcely<br />
visible. The apothecia are rather variable, being frequently, as<br />
Schrerer says, minute and several aggregate with a common exciple.<br />
TIns, as in other cases, is owing to the growth of young fruit upon<br />
the old.<br />
Hab. On calcareous rocks in hIlly and mountainous districts.<br />
Distr. Seen from only a few locahties III W. and Central England, N.<br />
Wales and the Grampians, Scotland.-B.ll:l. Bathampton Downs,<br />
Somerset; Black Dale, near Buxton, Derbyshire; Lyn Cae, Cader<br />
Idris, Merioneth; Cunswick Scar, Whitbarrow and Mallerstang, West·<br />
morland; Achosragan Hill, Appin, Argyll; Craig Tulloch, Blair<br />
Athole, Perthshire; Morrone, Braemar, Aberdeenshire.<br />
135. L. subumbonella Lamy in Bull. Soc. Bot. Fr. xxx. 409<br />
(1883).-Thallus effuse, thinnish, unequal, white, subopaque<br />
(K -, CaCI-). Apothecia minute or subminute, somewhat<br />
plane, margined, umbonate in the centre, black, opaque; hypothecium<br />
thickish, brown; paraphyses sub coherent, pale-brown<br />
at the apices; spores oblong-ellipsoid, 16-22 [! long, 7-9 [l. thick;<br />
hymenial gelatine bluish, the asci at length tawny-wine-red,<br />
with lOdine.-L. subumbonata Nyl. in Flora lix. 236 (1876), non<br />
in Flora Iv. 358 (1872); Cromb. in Grevillea v. 28; Leight. Lich.<br />
Fl. ed. 3, 306.<br />
Exs!cc. Johns. n. 42\).<br />
Tho apothecia, frequent in the specimens from Ireland, often appear<br />
as if divided into several hymenia. The spermogones, sparmgly<br />
present, have the spermatia cylindrical, or fusiform-cylindrical, 4-7 [l.<br />
long, 0·8 [l. thick. Johnson's speClmen from Cumberland has a somewhat<br />
thicker areolate thallus, and the apothecia arc occasionally<br />
aggregate.<br />
Hab. On mica-schist rocks in upland situations.-B. M. Wastdale,<br />
Cumberland; near Letterfrack, Connemara, Galway.<br />
136. L. contortula Stirton in Scott. Nat. iv. 167 (1877).<br />
Thallus pale or leaden-grey, thickish, somewhat wrinkled, rimoseareolate<br />
(K -, CaCI -). Apothecia black, adnate, rather large,<br />
plane or somewhat convex, umbonate or gyrose-plicate, with a<br />
thlCk margin; hypothecium brownIsh-black, brownish upwards;<br />
paraphyses distinct, brown at the apices; spores oblong or fusiform<br />
oblong, 15-21 [l. long, 6-7'5 fL broad, hymenial gelatine blue<br />
then wine-red with iodine.-Leight. Lich. Fl. ed. 3, 307.<br />
Stirton considered his species as allied to L. 81lbumbonella, but in<br />
L. contortula the paraphyses are slender and distmct and bright<br />
olivaceous-green to brown at the apices. The gyrose character as in<br />
L. jurana is due to the inclusion of several small apothecia of varying<br />
stages of development within a rather flexuose common exciple_<br />
Johnson's specimen from Bywell is more akin to L. contigua var.<br />
platycarpa.<br />
Hub. On rocks.-B. M. Near Salen, I. of Mull, Argyll.