470 CYCLOCARPINEX | LECIDEA 
adnate, black, large, plane, narrowly. marginate, becoming 
convex and almost immarginate, within cerulescent, especially 
upwards ; hypothecium thick, brownish-black ; paraphyses dis- 
crete, filiform, 2°5-3 p thick, the apices mostly blue, scarcely 
clavate ; spores colourless, simple, ellipsoid or often fusiform- 
ellipsoid, 22-36 » long, 8-11 p» thick ; hymenial gelatine intensely 
blue, the asci yellowish, with iodine. 
Evidently closely allied to if not identical with Lecidea petrosa 
Arn. ; but considered by Stirton as ‘near to L. cyanothalma Nyl. 
(Flora lv. p. 358 (1872) ), which scarcely differs from L. contigua Fr.” 
(Part 2, p. 67). 
Hab. On submerged rocks in Loch Rannoch, Perthshire. 
116. L. albocerulescens Ach. (Part 2, p. 69.) 
Var. smaragdula Knowles in litt.—Thallus continuous or 
dispersed, glaucous-white or white, with white hypothallus. 
Apothecia with slender, subcoherent paraphyses, clear-green or 
greenish-blue at the tips. 
Differs from the species in the white hypothallus and chiefly in 
the clear green colour of the epithecium in section. These differences 
may possibly be due to the submerged habitat. 
Hab. On coarse granite rocks, completely submerged except in 
summer —B. M. Shores of Lough Nahanaghan (1377 ft.), Wicklow. 
Collected by M. C. Knowles, Sept. 1914. 
129a. L. instratula Nyl. in Flora Ixi. p. 242 (1878).— 
Thallus dark-grey, thin, smooth, plane, minutely cracked-areolate, 
with a black hypothallus. Apothecia minute, black, innate and 
immarginate ; hypothecium colourless ; paraphyses distinct, but 
very coherent, the epithecium blackish-green; asci swollen ; 
spores ellipsoid, 9-12 » long, 4-5 w thick.—B. de Lesd. in Bull. 
Soc. Bot. Fr. liv. p. 444 (1907); Lillie in Scott. Bot. Rev. i. 
p. 152 (1912). Specimen not seen. . 
Evidently nearly allied to DL. plana (Part 1, p. 76). The deserip- 
tion is taken from Nylander and from B. de Lesdain. 
Hab. On granitic rocks. Collected by D. Lillie at Canister Cairns, 
Caithness. 
L. recensa Stirt. tom. cit. p. 219.—Thallus white or whitish, — 
convex-areolate (areole contiguous or dispersed). Apothecia 
sessile, black, plane, with a black margin (margin mostly 
undulate), small, often aggregate ; spores 8 in the ascus, colour- 
less, simple, oblong, curved or arcuate, 10-14 y» long, 3°5-4°5 p 
thick ; hypothecium colourless ; paraphyses sometimes irregular, 
thickish, with clavate brown tips; hymenial gelatine bluish 
with iodine. 
Stirton suggests that the above may be a form of L. rivulosa 
{Part 2, p. 87). 
Hab. On rocks, Craig Var, Perthshire. 
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