LECANORA. | LECANO-LECIDEET, 409 
Differs from the preceding species in the colour of the thallus and hypo- 
thallus, in the character of the thalline margin, and in the simple spores. 
The papilla: of the thallus, which is either orbicular or somewhat ex- 
anded, are minute, very much crowded, rather fragile, and form a some- 
what thickish and superficially granulose crust. In moister situations it 
is more greenish, its usual condition with us; whence form spodophea 
Cromb. (Parmelia spodophea Wahl. in Ach. Meth. Suppl. p. 37). The 
apothecia are numerous and crowded, with the thalline margin persistent 
and (except in very young apothecia) always crenulate. 
Hab. On granitic and schistose rocks in maritime districts — Distr. 
Local, though usually plentiful in the Channel Islands, S.W. England, 
and N.E, Scotland—B. M.: Le Fret, Island of Jersey. Tolpedn Pen- 
with, and near Penzance, Cornwall. Portlethen, Kincardineshire. 
&. Thallus uniform, K+. 
86. L. subfusca Nyl. Flora, 1872, p. 250, nota 2.—Thallus deter- 
minate, thin, subsmooth, or slightly rugoso-uneyual, whitish (K+ 
yellowish, CaCl—). Apothecia moderate, 
plane or somewhat convex, brown or reddish- 
brown, opaque or somewhat shining, the sy \ 
thalline margin entire ; paraphyses slender, } ( J 
discrete, brownish at the apices ; epithecium b iN a 
non-granulose; spores 0,011-16 mm. long, 
0,007-10 mm. thick; hymenial gelatine OQ 
bluish, then dark-violet (the thece dark 
tawny-coloured) with iodine.—Cromb. Gre- % 
villea, xviii. p. 68.--L. subfusca form argen- 
tata Cromb. Lich. Brit. p.51; Leight. Lich, 
Fl. p. 201, ed. 3, p. 186. LZ. subfusca y. Fig. 65. 
glabrata Mudd, Man. p. 146 pro parte. Lecanora suhfusea Nyl.— 
L. subfusca Hook. Fl. Scot. ii. p. 47, Sm. — @_ A spore and para~ 
Eng. Fl. v. p. 189, is a nomen vagum pro Lace o oe bs ae 
maxima parte (ut videtur)— Brit. Exs.: oe BOO. sa eittactis 
Larb. Lich. Herb. n. 217. 
A species until recently ill-defined and not well limited, several of 
those which immediately fellow being either confounded with it or 
viewed simply as varieties. These are now separated chiefly by dif- 
ferences in the paraphyses and epithecium, and also, according to 
Nylander /. ¢., in the size of the spermatia, The typical state includes 
Lecanora subfusca a. argentata Ach. Lich. Univ. p. 893, and y. glabrata 
Ach. J. ¢., which do not differ from each other. The apothecia are usually 
more or less crowded, rarely somewhat scattered. The spermogones have 
the spermatia 0,016-19 mm. long (fide Nyl. in litt.), and in this, as in the 
allied species, are black above. 
Hab. On trunks of trees, rarely on old pales, in maritime and lowland. 
tracts.— Distr. Seen only from a very. few localities in E., S., and W. 
England; no doubt to be detected elsewhere.—B. M.: Lyndhurst, New 
Forest, Hants ; Isham, Torquay, 8. Devon; near Cambridge; Churchill, 
near Worcester. 
