BIATORELLA | LECIDEACE® 475 
simplex Mudd Man. p. 160 (1861). Lecanora simplex Nyl. ex 
Cromb. Lich. Brit. p. 57 (1870) & Monogr. i. p. 490 (incl. f. 
herpes) (1894). L. squamulosa f. simplex Leight. Lich. Fl. p. 185; 
ed. 3, p. 170. 
Exsice. Johns. nos. 418, 419; Larb. Lich. Hb. without a 
number ; Leight. nos. 272, 273. 
The thallus is only rarely visible as a thin scurf; it is, however, 
present within the substratum. The species in this and other respects 
is nearly allied to B. pruinosa, though the apothecia are smaller and 
more irregular in form; a form with extremely wrinkled apothecia 
has been classified as Opegrapha Persoonit var. strepsodina Ach. (Lich. 
Univ. p. 247); if angulose and gyrose-plicate it is Lecanora simplex 
f. complicata Cromb. in Grevillea xix. p. 58 (1891). 
Hab. On rocks chiefly schistose and calcareous in maritime and 
mountainous regions.— Distr. Not uncommon throughout the British 
Isles.—B. M. La Moye, Jersey ; Chateau Point, Sark ; Tintagel, Withiel 
and Penzance, Cornwall; Buckfastleigh, Ashburton and Ilfracombe, 
Devon; Aberdovey, Barmouth and Dolgelly, Merioneth; Bangor, 
Carnarvonshire ; Anglesea; north of Douglas, Isle of Man; Hexham 
and Bywell, Northumberland; Barcaldine, Ballachulish and Glencoe, 
Argyll; Craig Calliach, Ben Lawers and Craig Tulloch, Blair Athole, 
Perthshire; Bay of Nigg, Kincardineshire; Craig Guie and Morrone, 
Braemar, Aberdeenshire ; Dunkerron, Kerry; Glencorbot, Connemara, 
Galway. 
BILIMBIA De Not. (Part 2, p. 133.) 
B. ilyophora Wheld. & Wils. in Journ. Bot. liii. Suppl. p. 63 
(1915).—Thallus black, sometimes gelatinous, thin. Apothecia 
black, small (-2—-4 mm. wide), convex, immarginate, at length 
hemispherical, rugulose, within entirely violaceous as in Lecanora 
atra (K + bluish-green) ; hypothecium concolorous ; paraphyses 
not distinct, sometimes irregular ; spores 8 in the ascus, colour- 
less, acute at one end, sometimes curved, 1—3-septate, 14-20 pu 
long, 4-5 p» thick; hymenial gelatine dirty-blue with iodine.— 
Lecidea ilyophora Stirt. in Scott. Nat. v. p. 220 (1880). 
Considered by Stirton to be allied to Bilimbia. (Lecidea) melena 
Arnold, and from the description might be the same plant. 
Hab. On dead wood, Kinloch Rannoch, Perthshire. 
BACIDIA De Not. (Part 2, p. 149.) 
8a. B. latebricola Wheld. & Trav. in Journ. Linn. Soc. Bot. 
xliti. p. 127 (1915).—Thallus greenish-yellow, granular-leprose, 
effuse (K —, CaCl —). Apothecia minute, rare, at first flesh- 
coloured, then livid, and blackish when old; epithecium colour- 
less ; hypothecium almost colourless ; hymenium colourless and 
not at first blue with iodine; asci cylindrical-clavate, 35-45 p 
long ; paraphyses clavate ; spores narrowly linear-clavate, mostly 
obtuse at one end, narrowing at the other, variously curved, 
