324 CYCLOCARPINEE [LECANORA 
p- 677 (1810). Aspieilia cinerea var. cinereorufescens Mudd Man. 
p- 163 (1861)? 
Differs from L. cinerea in the colour of the apothecial dise, more 
brightly red when moist, and in the absence of reaction with potash. 
The species has not been recorded in our country, only the following 
form. 
Form diamarta Nyl. 1. c.—Thallus yellowish-red. Apothecia 
similar to that of the species, but the thalline margin or the 
contiguous thallus often somewhat crenate.—Cromb. Lich. Brit. 
p- 55 & Monogr. i. p. 468; Leight. Lich. Fl. p. 211; ed. 3, 
p. 197. Urceolaria diamarta Ach. Meth. Lich. p. 151 (1803) ; 
S. F. Gray Nat. Arr. i. p. 458% Lichen diamartus Wahlenb. FI. 
Lapp. p. 414 (1812). L. sinopicus Sm. Engl. Bot. t. 1776 (lower 
magnified fig.) (1807) (non Wahlenb.). 
The rusty colour of the thallus is due to the large quantity of iron 
in the rocky substratum. The apothecia are abundant, but spermo- 
gones are few, with spermatia 4-5 » long, 1 » thick (fide Crombie). 
Hab. On a mica-schist rock in an alpine situation.—B. M. Above 
Loch-na-Gat, Ben Lawers, Perthshire (the only British record). 
77. L. recedens Nyl. in Flora Ixii. p. 361 (1879).—Thallus 
determinate or effuse, mostly rather thick, deeply cracked-areolate, 
ashy-grey (K—,CaCl—). Apothecia rather small, often crowded, 
innate, the disc brownish-black, the thalline margin generally 
prominent ; paraphyses long, thickly septate, almost moniliform 
especially towards the tips, the epithecium dark-brown ; spores 
broadly ellipsoid or subglobose, 10-12 » in diam. or 14 p long, 
9 p thick; hymenial gelatine blue with iodine-——Cromb. in 
Grevillea xix. p. 57 (1891) & Monogr. i. p. 469. L. subcinerea 
Nyl. in Flora lii. p. 82 (1869); Cromb. in Journ. Bot. xiii. p. 140 
(1875); Leight. Lich. Fl. ed. 3, p. 197. Lecidea recedens Tayl. 
in Mackay FI. Hib. ii. p. 117 (1836). 
Ezxsice. Larb. Lich. Hb. n. 299. 
Differs from L. cinerea in the form of the small spores and the 
absence of reaction with iodine in the medulla. Larbalestier’s specimen 
has a thinner thallus than the others, but the microscopic details are 
identical. 
Hab. On rocks in maritime and upland districts.—Distr. Very 
rare in N. Wales, N. England, and §. and W. Ireland.—B. M. Bar- 
mouth, Merioneth; Holwick Scar, Yorkshire; Dunkerron, Kerry; 
Derryclare, Connemara, Galway. 
78. L. decincta Nyl. in Flora lxv. p. 452 (1882).—Thallus 
determinate, rather thick, smooth, cracked-areolate, the areole 
often rounded, umber-grey on a black hypothallus (K—, CaCl—). 
Apothecia rather small, semi-immersed then plane or convex, 
black, the thalline margin thinnish, disappearing ; paraphyses 
