78 COLLEMACEI. [CoLLEMOPsIS. 
1. C. Schereri Nyl. ex 
Cromb. Journ. Bot. 1874, 
p. 332, — Thallus subeffuse, 
thinnish,areolato-granulose,or 
minutely granuloso-squamu- 
lose, brownish-black or black- 
ish. Apothecia small or nearly 
moderate, plane, lecanorine 
(with distinct thalline margin), 
brownish- or reddish-black ; 
spores ellipsoid, 0,014-21mm. 
long, 0,007-11 mm. thick ; 
hymenial gelatine pale blue 
and then tawny with iodine. 
—Leight. Lich. Fl. ed. 3, 
p- 25.—Pyrenopsis Scherert 
Fig. 20. 
Nyl. olim, Cromb. Lich. Brit. Collemopsis Schereri, Nyl.—a Section of a 
F ; . small portion of the thallus, x 200. 4. 
p. 2; Leight. Lich. Fl. p. 15. Gonimia, x 350. c¢. Section of an apo- 
P annaria Schierert Mass. Ric.  thecium, x30. d. Theea with a para- 
Aut. Lich. (1852) p. 114.— physis, x350. ¢. Spores, x500. f. 
Brit. Exs.: Cromb. n. 2. terigmata and spermatia, x 500. 
This is often less developed, with the thaFus granulose and diffract, 
though when fully developed it is more squamulose and continuous. The 
apothecia, for the most part, are very numerous and crowded, sometimes 
nearly obliterating the thallus, smaller, and becoming somewhat convex 
and immarginate in the less developed, or moderate, plane, with persis- 
tent margin in the best developed conditions. 
Hab. On cretaceous pebbles and limestone walls and rocks in moist 
shady upland situations.—Di¢str. Local, though plentiful, in S., W., and 
Central England, amongst the Central:and N. Grampians of Scotland, 
and in N.W. Ireland.—B. M.: Maidstone, Kent; Box Hill and Shiere, 
Surrey ; Bathampton Downs and Babington, Somersetshire ; Chalford and 
near Cirencester, Gloucestershire ; Buxton, Derbyshire; Egremont, Cum- 
berland. Craig Tulloch, Blair Athole, Perthshire; Craig Guie, Braemar, 
Aberdeenshire. Kylemore, co, Galway. 
2. C. lecanopsoides Nyl. ex Cromb. Journ. Bot. 1874, p. 332.— 
Thallus thin, opaque, granuloso-areolate, or nearly continuous, some- 
what scabrous, dark-brown or brownish-black. Apothecia small, 
urceolate, concolorous, the margin prominent, connivent; spores 4— 
8ne, ellipsoid, 0,012-20 mm. long, 0,006-11 mm. thick, paraphyses 
slender, not crowded ; hymenial gelatine bluish with iodine.—Leight. 
Lich. Fl. ed. 3, p. 85.—Pyrenopsis lecanopsoides Nyl. Flora, 1866, 
p. 874; Carroll, Journ. Bot. 1867, p. 254;. Cromb. Lich. Brit. p. 3; 
Leight. Lich. Fl. p.15. Collema pyrenopsoides Nyl. Mém. Soc. 
Cherb. v. p. 89; Syn. i. p. 203. Lecanora pyrenopsoides Nyl. Bot. 
Not. (1853) p. 163. 
This, as Nylander observes (Syn. p. 103), is at first sight not unlike 
C. fuliginea (Wahl.), and also has considerable resemblance to obscure 
