472 CYCLOCARPINEE [BIATORELLA 
greenish when wet, greyish-white when dry (K —, CaCl —). 
Apothecia small or moderate in size, appressed, plane, reddish- 
black when moist, black, often bluish-grey-pruinose when dry, 
sometimes with a thin pseudo-margin; hypothecium pale ; 
paraphyses slender, coherent, thickly septate, scarcely widened 
and brown towards the apices; spores many in the ascus, 
minutely ellipsoid or oblong, 3-5 p» long, about 2 pw thick ; 
hymenial gelatine bluish then tawny with iodine.—Lichen 
pruinosus Sm. Engl. Bot. t. 2244 (1811) (non Ach.). Lecidea 
pruinosa Hook. in Sm. Engl. Fl. v. p. 179 (1833) pro parte; 
Tayl. in Mackay FI. Hib. ii. p. 125 pro parte. Lecanora pruinosa 
Cromb. Lich. Brit. p. 57 (1870) & Monogr. i. p. 487, fig. 68. 
L. glaucocarpa f. pruinosa Leight. Lich. Fl. p. 183 (1871) ; ed. 3, 
. 168. 
. Ezsicc. Johns. n. 420; Leight. n. 300; Mudd n. 160. 
Distinguished from allied species by the habitat and by the 
frequently pruinose disc of the apothecium. The thallus is some- 
times immersed and scarcely visible. 
Hooker (in Sm. Engl. Fl. 1. c.) has quoted as a synonym Lichen 
pruinatus Dicks. (errore L. pruinosus), published in Pl. Crypt. 
fase. iii. p. 15, t. 9, fig. 4 (1793). According to the description, that 
species has a ferruginous thallus and may possibly be a form of 
Lecidea confluens. 
Hab. On calcareous rocks and mortar of walls from maritime to 
upland regions.—Distr. General and common in the British Isles.— 
4. M. Near Penzance, Cornwall; Shanklin, I. of Wight; Lewes and 
Malling, Sussex; Shiere, Surrey ; Cirencester, Gloucestershire ; near 
Hereford; Harboro’ Magna and Polesworth, Warwickshire; near 
Malvern and Whittington, Worcestershire ; near Corwen, Merioneth ; 
near Shrewsbury, Shropshire; Ingleton and Bilsdale, Cleveland, 
Yorkshire; near Gainford, Durham; Leven’s Park and Staveley, 
Westmoreland ; Appin, Argyll; King’s Park, Stirling; Craig Tulloch, 
Blair Athole, Perthshire ; near Aberdeen; Dunkathal, Cork; White 
Park Bay, Antrim. . 
Form nuda A. L. Sm.—Thallus little visible or entirely 
immersed. Apothecia reddish-brown, epruinose. — Lecanora 
pruinosa £. nuda Nyl. ex Lamy in Bull. Soc. Bot. Fr. p. 423 
(1878) ; Cromb. in Grevillea xix. p. 58 (1891) & Monogr. i. 
p. 488. 
Lamy found this form abundant on the granitic stones of old 
buildings, and remarks on the regular well-opened epruinose apothecia. 
[t is often difficult to distinguish it from the species. 
Hab. On rocks chiefly calcareous, rarely siliceous and on mortar 
of walls in upland regions.— Distr. Widely distributed but rather rare 
in the British Isles.—B. M. Near Bovey Tracey, Devon; Egerton, 
Kent; Cirencester, Gloucestershire ; Malvern, Worcestershire ; Appin, 
Argyll; Ben Lawers and Craig Tulloch, Blair Athole, Perthshire ; 
Applecross, Rossshire. 
Var. albocincta A. L. Sm.—Thallus immersed. Apothecia 
thinly pruinose or naked, with a white pruinose pseudo- 
— a Se 
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