RINODINA | PHYSIACEE 255 
Hab. On granitic and schistose rocks in maritime and inland 
localities.—Dzst. Rare throughout the British Isles —B. M. La 
Coupe, Jersey ; The Lizard, Cornwall; near Hastings, Sussex ; 
Portlethen, Kincardineshire; near Crookhaven, Cork; Doughruagh 
Mt., Kylemore and Dawros River, Connemara, Galway ; Ardglass, 
Down. 
7. R. atrocinerea Koerb. Syst. Lich. Germ. p. 125 (1855). 
—Thallus effuse or determinate, thickish, whitish- or dark- 
grey, generally of rounded smooth verruce, continuous and 
crowded or scattered, with a black hypothallus (K + yellow, 
CaCl + reddish). Apothecia at first minute and innate in the 
verruce, becoming plane, at length convex, the dise dark-brown 
or blackish, the thalline margin rather thin, entire, becoming 
obliterated ; spores ellipsoid, 17-25 » long, 10-12 yp thick.— 
Mudd Man. p. 144, t. 2, fig. 49. Lichen atrocinereus Dicks. PI. 
Crypt. fasc. iii. p. 14, t. 9, fig. 2 (1793) ; With. Arr. ed. 3, iv. 
p. 19; Engl. Bot. t. 2096. Lecidea atrocinerea Hook. in Sm. 
Engl. Fl. v. p. 174 (1833). Lecanora milvina Tayl. in Mackay 
Fl. Hib. ii. p. 134 (1836) pro parte (non Wahl.). DL. atrocinerea 
Nyl. in Flora liii. p. 38 (1870); Cromb. in Journ Bot. viii. p. 97 
(1870) & Monogr. i. p. 398; Leight. Lich. Fl. p. 226; ed. 3, 
p-. 216. 
Exsicc. Leight. n. 146. 
Differs from allied species in the reaction with CaCl; but the 
light-coloured verruce on the black hypothallus also give a dis- 
tinctive tessellated appearance to this plant. Crombie has given 
spore sizes up to 30 » long and 16 » thick, but I have not been able 
to verify these large measurements. Spermogones are not infrequent 
with spermatia 7-9 p» long, 1-2 p thick. 
Hab. On rocks in maritime and upland districts.—Dist. Here and 
there throughout the British Isles—B. M. Guernsey; near Pen- 
zance, Cornwall; Crown Hill, Plympton, Devon; Lyth Hill, 
Shropshire ; Barmouth, Merioneth ; Holyhead, Anglesea; Barcaldine, 
Argyll; Portlethen, Kincardineshire; near Cork; Cliffs of Moher, 
Clare ; Dunkerron and Carig Mt., Kerry. ; 
8. R. subexigua Oliv. Lich. Eur. fase. 2, p. 181 (1909).— 
Thallus effuse, smooth, cracked-areolate, pale-greyish or dull- 
yellowish (K—). Apothecia minute, plane, the disc blackish, 
the thalline margin thick, entire, persistent ; paraphyses slender, 
sometimes branched, knobbed and brown at the tips; spores 
ellipsoid, rather narrow at the ends, 12-18 yp long, 6-10 p thick. 
—Lecanora subexigua Nyl. in Flora Ivii. p. 308 (1874) ; Cromb. 
in Grevillea iii. p. 22 & Monogr. i. p. 396; Leight. Lich. FI. 
ed. 3, p. 220. 
The thallus is somewhat thicker than in R. erigua. The spores 
vary, but do not differ in size. 
Hab. On granitic rocks in meritime districts-—Dist. Rare in S.W. 
England and E. Ireland.—B. M. Near Penzance, Cornwall. 
