LECANORA. | LECANO-LECIDEET. 419 
Lecanora peralbella Nyl. Flora, 1872, p. 365; Leight. Lich. Fl. ed, 3, 
p. 206. 
Originally regarded by Nylander as specifically distinct, this is now 
viewed by him only as a form characterized by the reaction of the 
hymenial gelatine. 
Hab. On thorns and trunks of trees in a maritime district—Distr. Very 
rare in N.W. Iveland.—B. M. : Killery Bay and Ballynahinch, Con- 
nemara, co. Galway. \ 
Form 2. subalbella Nyl. ev Hué, Rev. Bot. 1887, p. 161.— 
Spores 0,009-11 mm. long, 0,005-7 mm. thick; hymenial gelatine 
and the thece bluish, then darker with iodine.—Cromb. Grevillea, 
XVili. p. 68.—Lecanora subalbella Ny]. Flora, 1872, p. 365.—Lichen 
rosellus Eng. Bot. t. 1651 (apotheciis magis convexis). 
Only another form of LZ. albella, though more distinct than the pre- 
ceding, differing not merely in the reaction of the hymenial gelatine but 
also in the slightly smaller spores and the slightly longer spermatia, which 
fide Nylander are 0,016-22 mm. long. 
Hab. On the trunks of trees in wooded maritime and upland tracts.—. 
Distr. Only sparingly in S. England.—B. M.: Netley Abbey, near Bartly 
Lodge, and Bramble Hill, New Forest, Hants. 
99. L. angulosa Ach. Lich. Univ. (1810) p. 364; Nyl. Flora, 
1872, p. 250.—Thallus determinate, thin, smooth, at length unequal 
or rugoso-subrimose, greyish-white (K+yellow, CaCl—). Apo- 
thecia small or submoderate, plane or slightly convex, crowded and 
subangulose, pale-brown or sordid-pale, slightly ceesio-pruinose 
(epithecium CaCl+yellow); the thalline margin thin, subentire or 
somewhat crenulate, at length subevanescent ; paraphyses slender, 
sabdiscrete; epithecium granulose; spores 0,009-16 mm. long, 
0,006-9 mm. thick; hymenial gelatine persistently bluish with 
iodine.—Leight. Lich. Fl. ed. 3, p. 205.—L. albella subsp. angulosa 
Cromb. Lich. Brit. p. 51; var. 3. angulosa Mudd, Man. p. 148. 
L. subfusca var. angulosa Leight. Lich, Fl. ed. 1, p. 204. Lichen 
angulosus Schreb. Spicil. (1771) p. 136.—Brit. Hxs.: Mudd, nos, 
114, 115. 
Usually regarded as only a variety (or subspecies) of L. albella, this 
essentially differs in the positive reaction of the epithecium with CaCl, 
and in the black colour of the spermogones above. Among minor cha- 
racters it also differs in the crowded angulose apothecia, especially in the 
centre of the thallus, and in the rather larger spores. The spermatia are 
‘shorter than in the preceding species, being (fide Nyl. zm itt.) 0,014-18 
mu. long. 
Hab. On trunks of trees, rarely on old pales, in maritime and upland 
districts—Distr. Here and there in Great Britain and Ireland; not seen 
from the Channel Islands.—B. M.: Epping Forest, Essex; near Lewes 
and Hastings, Sussex; New Forest, Hants; Ullacombe, Bovey Tracey, 
S. Devon; Cirencester, Gloucestershire ; Cliffrigg and near Easby, Cleve- 
land, Yorkshire ; Catterleen, Cumberland, Appin, ee ; Finlarig, 
Ez 
