PYRENOPSIS. ] PYRENOPSEI. 25 
local and scarce, in N. Wales and S. W. Ireland.—B, M.: Near Barmouth, 
Merionethshire. Near Killarney, co. Kerry. 
4. P. phylliscella Nyl. Flora, 1875, p. 102.--Thallus effuse, 
squamulose, dark-brown, squamules somewhat subverrucoso-unequal, 
subadnate, aggregate but not contiguous, rotundato-difform. Apo- 
thecia endocarpoid, very minute, 5-15 in each thalline squamule ; 
epithecium punctiform, concolorous, with thin thalline margin; 
spores 8ne, oblongo-ellipsoid, 0,005-7 mm. long, 0,003 mm. thick ; 
paraphyses few ; hymenial gelatine bluish, the thece dark-violet with 
iodine. —Cromb. Grevillea, iii. p.,190; Leight. Lich. Fl. ed. 3, p. 14. 
The squamules of the thallus are composed of minute aggregate 
granules, which are usually distinct from each other, though here and 
there becoming contiguous. Its nearest ally is P. tasmanica Nyl., rather 
than any of our British species, though at first sight it. somewhat resembles 
P. fuscatula, The apothecia are numerous and crowded in the fertile 
squamules, and the spermogones are not unfrequent, with spermatia 
thin, oblong, or fusiformi-oblong. 
Hab. On quartzose boulders in subalpine streams.—Distr. Extremely 
local and searce, among the Central Grampians, Scotland.—B. M.: 
Ben-y-gloe, Blair Athole, Perthshire. 
5. P. homeopsis Nyl. Flora, 1868, p. 8342.—Thallus effuse, thin, 
subgranulose, unequal, subareolate, reddish-brown. Apothecia 
minute, lecanoroid, concolorous, pale within, the margin connivent, 
epithecium narrow, colourless; spores 8ne, 0,011-18 mm. long, 
0,007-10 mm. thick; paraphyses slender; hymenial gelatine red 
or tawny wine-coloured with iodine.——Cromb. Journ. Bot. 1869, 
p. 48; Lich. Brit. p. 2; Leight. Lich. Fl. p. 15, ed. 3, p. 14. 
This is closely allied to P. grumulifera, Nyl., from which it differs 
chiefly in the larger dee and gonimia, as also in the thallus being 
internally feet especially under the apothecia. In the few specimens 
gathered, the thallus, except in one instance, was associated with Lecanora 
frustulosa, and for the most part sterile. 
Hah. On mica-schist rocks in alpine places.—Distr. Very local 
and rare, having been found only on two of the S. Grampians, Scotland.— 
B. M.: Summits of Ben Lawers and Craig Calliach, Perthshire. 
6. P. furfurea Nyl. ea Cromb. Journ. Bot. 1874, p. 332.—. 
Thallus effuse, thinnish, granulato-areolate, brownish-black or black, 
when moist rubricosely blackish or rubricosely reddish. Apothecia 
minute, at length nearly urceolariform, the margin tumid; spores 
8ne, 0,010-12 mm. long, 0,007-8 mm. thick; hymenial gelatine 
wine-red with iodine.—Leight. Lich. Fl. ed. 3, p. 14.—Collema 
furfureum Nyl. Flora, 1865, p. 353; Carroll, Journ. Bot. 1865, 
p. 286; Cromb. Lich. Brit. p. 3; Leight. Lich. Fl. p. 17. 
According to Nylander, in it., this somewhat anomalous species 
is perhaps referable rather to the genus Phylliscum, to which it approaches 
in the structure of the thallus. “ This, which superficially is rubricoso- 
reddish, as in Pyrenopsis, is internally colourless, gelatinose, and excavated 
with minute, frequent, cellular cavities, among which are scattered 
somewhat large, oblong, simple, glaucous gonimia, as in Phylliseum, which 
