BRITISH LICHENS

240 GRAPHIDINEAJ: ARTHONIA
23. A. Lilliei B. ue Lesd. in Bull. Soc. Bot. Fr. lvii. 34 (1910).
-Thallus blackish, leprose, very slight. Apothecia black,
minute, about '1-'2 mm. in diam., round, persistently plane;
hypothecium colourless; hymenium colourless or pale-brown;
paraphyses closely coherent, the apices free and capitate, the
epithecium olivaceous; asci ventricose; spores 8 in the ascus,
colourless, oblong or ellipsoid, I-septate, scarcely constricted, the
cells equal, 10-12 (.L long, 4-5 (.L thick; hymenial gelatine wine-red
with iodine.-Lillie in Scott. Bot. Rev. i. 153 (1912); A. L. Sm.
Monogr. i. 481 (1918). Specimen not seen.
Somow hat dIfficult to place in tho lack of information as to the
gonidia; it seems to agree with § Lecideopsis rather than WIth § Euarthoma.
Hab. On siliceous rocks. Collected by D. Lillie at Achastle,
Caithness.
Spores 3-4-septate.
24. A. paralia Nyl. in Flora Ix. 565 (1877).-Thallus darkgreyish
or reddish-brown, thin, rather smooth. Apothecia
dark-brown, roundish, nearly plane; colourless within; spores
elongate-ovate, subconstricted in the middle, 3-4-septate, 18-22 (.L
long, 7 (.L thick; hymenial gelatine wine-red WIth iodine.­
Cromb. in Grevillea vi. 114; LeIght. Lich. Fl. ed. 3, 421.
Exsicc. Larb. Lich. Rb. n. 113.
Hab. On maritime rocks.-B. lIf. Cleghan, Connemara, Galway
(the only locality).
25. A. myriocarpella Nyl. in Ann. Sci. Nat. ser. 4, xx. 238
(1863).-Thallus pale-ashy-grey, efiuse, thin, subareolate or
subpulverulent, sometimes evanescent. Apothecia minute,
brownish-black, roundish, plane or convex, blackish within;
spores oblong-ovoid, colourless, 3-septate, 10-12 (.L long, 3-4 (.L
thick.-Carroll in Journ. Bot. iii. 292 (1865); Cromb. Lich. Brit.
104; Leight. Lich. Fl. 394; ed. 3, 418. Specimen not seen.
llab. On mica· schist rocks, collected at Aviemore, Inverness·shire,
Parasitic 01! other Lichens.
26. A. varians Ny!. Lich. Scand. 260 (1861).-Thallus none.
Apothecia dull-black, rounded, scattered or confiuent, plane or
somewhat convex, roughish, internally pale-brown; spores
oblong, usually 3-, sometimes 1- or 2-septate, colourless, 12-18 (.L
long, 6-8 (.L thick; hymenial gelatine usually blue then wine-red
with iodine.-Cromb. Lich. Brit. 104; Leight. Lich. Fl. 402;
ed. 3, 426. A. glaucomaria Ny!. in Mem. Soc. Sci. Nat. Cherb.
iv. 98 (1856); Leight. in Ann. Mag. Nat. Rist. ser. 2, xviii. 330
(1856); Carroll in Nat. Rist. Rev. vi. 532 (1859). A. parasemoides
Ny!. 1. c. and in Mem. Soc. Sci. Nat. eherb. ii. 330 (1854); Mudd
Man.251. Lichen varians DaVIes in Trans. Linn. Soc. (Bot.) ii. 284,