BRITISH LICHENS

LECANACTIS LECAN ACTIDACElE 223
Moccas Court and Brampton Bryan Park, Herefordshlre; Norton,
Worcestershire; Bradgate Park, Leiccstershue; Harboro' Magna
and Packington Park, Warwickshire; Nannau, Dolgelly, Merioneth ;
Abdon and Haughmond Hill, Shropshire; Ickworth, Suffolk; Nottmghamshirc;
Derbyshire; Kildale, Cleveland, Yorkshire; Castle Bernard
Park, Bandon, Cork; Derryquin, Kerry; Adare Abbey, LimerIck.
Var. saxicola A. L. Sm.-Thallus greyish-green, thin, furfuraceous.
Apothecia black, sessile, greenish-pruinose or naked,
otherwise as in the species. Schismatomma premneum var. saxicolum
Mudd Man. 222 (1861). Lecidea premnea f. saxicola
Leight. Lich. Fl. ed. 3, 365 (1879).
Exsicc. Leight. n. 185; Mudd n. 198; Larb. Lich. Hb. n. 73.
Differing mainly in the habitat. Leighton distinguishes two
other saxicolous forms: teichoycna and crenatula (Lecidea premnea
f. tcichoyena Nyl. ex Leight. l. c., and i. crenatula Ny!. ex Leight. l. c.),
both with Bcanty or evanescent thallus, the apothecia naked, the
margin somewhat crenulate or flexuose in the latter.
Hab. On rocks, walls, &c.-Distr. Rare in the Channel Islands,
England and W. Il'eland.-B. 111. La Moye, Jersey; Ventnor, I. of
Wight; Nesscliffe, Shropshire; Airyholme Wood, Cleveland, Yorkshire;
Doughruagh Mt., Kylemore, Connemara, Galway.
2. L. abietina Koerb. Syst. Lich. Germ. 276 (1855).-Thallus
white or greyish-white, effuse, thin, furfuraceous (K -, CaCl-).
Apothecia moderate in size or larger, sessile, with a thickish,
prominent margin, black, but thickly whitish- or pale-yellowishpruinose;
hypothecium black; paraphyses slender, conglutinate;
epithecium brownish; spores acicular-fusiform, 3-septate, 35-40 (.L
long, 4-6 (.L thiek; hymenial gelatine slIghtly bluish then wine-red
with iodinc.-Lichen abietinus Ach. in Vet. Acad. Handl. xvi.
139, t. 5, f. 7 (1795). Sphwria leucocephala Pers. Syn. Fung.
Add. xxvii. (1801) (spermogoniiferous). Verrucaria leucocephala
Ach. Meth. 116 (1803); Borr. in Engl. Bot. Suppl. t. 2642, f. 2
Hook. in Sm. Engl. Fl. v. 152; Tayl. in Mackay Fl. Hib. ii. 90.
Pyrenothea leucocephala Fr. Lich. Eur. 450 (1831); Leight.
Angioc. Lich. 65, t. 28, ff. 1 & 2. Lecidea abietina Ach. Meth.
54 (1803); S. F. Gray Nat. Arr. i. 468; Hook. in Sm. Engl. F!.
v. 179; Cromb. Lich. Brit. 90; Leight. Lich. Fl. 330; ed. 3,
354. Schismatomma abtetinum Massa!. RlC. Lich. 56, f. 102
(1852); Mudd Man. 223.
Exsicc. Bohl. n. 115 (as Verlucaria leucocephala); Leight
nos. 163 & 164; Mudd n. 200; Johns. n. 344.
Differs from the preceding in the dense whitish pnnna covering
more especially the apothecul.. The spermogones (Sphrona leucocephala)
which have rather large spermatla (12-16 (.L long, 3--4 !L thick),
are sometimes alone present, and resemble small whitish.grey globules.
Leighton (Angioc. Lich. 66 & 67, t. 28, ff. 6 & 7) describes two somewhat
similar forms: Pyrenothea rudis (Exsicc. n. 102 as P. vermicelliferal
and P. aphanes (Verrucana rudis Borr. Eng). Bot. Supp). t. 2637,