BRITISH LICHENS

370 PYRENOCARPEJE PORINA
Perithecia dark-coloured; spores 3-7- (rarely more-) septate.
11. P. olivacea A. L. Sm.-'l'hallus effuse, thin, continuous
or becoming slightly cracked, smooth or somewhat wrinkled,
dull olive-brown. Perithecia hemispherical, small, numerous,
prominent, immersed at the base, black; perithecial wall dimidiate;
paraphyses stoutish, free; asci cylindrical-clavate; spores
elongate-clavate, 3-7 -septate, colourless, 27-40 fL long, 4-5 fL
thick.-Verrucaria olivacea Pers. in Vst. Ann. Bot. vii. 28, t. 3,
fig. 6 (1794) 1 Borr. in Sm. EngI. Bot. Sup pI. t. 2597, fig. 1 (1829);
Hook. in Sm. EngI. Fl. v. 150; TayI. in Mackay Fl. Hib. Ii. 89;
Leight. Angioc. Lich. 42, t. 18, f. 1 & Lich. Fl. 452; ed. 3, 483;
Cromb. Lich. Brit. 117. Arthopyrenia ohvacea Mudd Man. 301
(1861).
Exsicc. BohI. n. 82; Leight. n. 199; Mudd n. 290.
Hab. On the bark of trees.-Distr. Rather rare throughout England
and Wales and S. and W. Ireland, not recorded from the Channel
Islands nor from Scotland.-B . .ill. Duncton and Henfield, Sussex;
Shere, Surrey; Silbertswold, Kent; near Cirencester and Stowell Park,
Gloucestershlre; Matlock Tor, Derbyshire; Gwydir Woods, Bettws.y­
Coed, Carnarvonshire; Easby Wood and Sowerdale, Cleveland,
Yorkshire; Levens, Westmorland; Tullagreen and Ballyedmond,
Cork, Muckross, Killarney, Kerry; Killaloe, Clare; Loughcooter,
Galway.
12. P. faginea Arn. in Flora lxviii. 166 (1885).-Thallus
whitish or crcam-coloured, thin, effuse. Perithecia black,
minute, semi-immersed, hemispherical; perithecial wall dimidiate ;
paraphyses crowded, distinct; spores broadly lanceolate-fusiform,
colourless, usually 5-7- (rarely more-) septate; 30-37 fL long (or
longer), 3-8 fL thick.-Sagedia faginea (sub Segestria) Schrer.
Enum. 208 (1850). S. lactea Koerb. Syst. Lich. Germ. 366 (1855).
Verrucaria lactea Leight. Lich. FI 452; ed. 3, 483.
,
Hab. On trees.-Distr. Rare in S. England (Sussex).
13. P. ieptospora A. L. Sm.-Thallus very thin, brown.
Perithecia minute, black, hemispherical, the base immersed; the
ostiole a minute papilla, perithecial wall entire, or thin under
the base; paraphyses scanty, distinct; asci cylindrical, slightly
narrower upwards, about 90 fL long, 10-12 fL thick; spores 8 in
the ascus, colourless, elongate-fusiform, 8- or more-septate,
45-55 fL long, 3-4 fL thick.-Verrucana leptospora Nyl. in Flora
xlvii. 487 (1864) & Ii. 164 (1868); Carroll in Journ. Bot.
vi. 101 (1868); Cromb. Lich. Brit. 117; Leight. Lich. FI. 452;
ed. 3, 484.
Outwardly very similar to P. olivacea, but differing in the entire
perithecium and in the character of the spores.
Hab. On bark of holly.-B. M. Dinish, Killarney, Kerry.