CALICIUM. | CALICIEL. 93 
Form 1. chlorodes Nyl. ev Cromb. Grevillea, xv. (1886) p. 14.— 
Thallus effuse, thinnish, granuloso-leprose, greenish-yellow. Apo- 
thecia small, scattered ; stipes short, black. 
The colour of the thallus, if not abnormal, would render this a very 
distinct variety. The apothecia are smaller and usually more slender 
than in var. denticulare, but in other respects quite similar. 
Hab. On old pales in upland tracts.—Distr. Found only sparingly in 
E, and S. England.—B. M. : Epping Forest, Essex ; near Shiere, Surrey ; 
near Bovey Tracey, 8. Devon. y 
Subsp. C. curtiusculum Nyl. Flora, 1879, p. 360.—Thallus effuse, 
granulate, whitish. Apothecia black ; stipes short ; capitulum len- 
tiform, white-pruinose at the extreme margin; spores 0,006-10 
mm. long, 0,0035—-45 mm. thick.—Cromb. Grevillea, viii. p. 114.— 
Brit. Exs.: Larb. Lich. Hb. n, 82. 
As indicated by Nylander (/. c.), most probably a subspecies of C. quer- 
cinum, differing in the short stipes and in the marginal pruina. The 
apothecia, sometimes nearly sessile, are numerous and crowded. 
Hab. On-bark of old firs, and on pales in shady lowland tracts— 
Distr. Local and scarce in S. and E. England.—B. M.: Near Lewes, 
Sussex ; Oakington, Cambridgeshire. 
10. C. pusillum Flérke, Deutsch. Lich. (1815) n. 188.—Thallus 
maculate, greyish or whitish, obsolete or none. Apothecia small, 
entirely black, the stipes slender ; spores 1-septate, 0,005—0,010 mm. 
long, 0,0025-0,005 mm. thick.—Nyl. Syn. i, (1860) p. 157 ; Cromb. 
Journ. Bot. 1882, p. 272. 
Looks like a minute variety of C. querctnum, but is constant to its own 
type. Analogous modifications cccur in almost all the other species, 
though usually on the same plant as their types. The very few British 
specimens have the thallus obsolete and apothecia minute and scattered. 
Hab. On decorticated firs in wooded situations.—Distr. Extremely 
local and scarce in 8. Iveland.—B. M.: Deer Park, Castlemartyr, co. 
Cork. 
11. C. curtum Turn. & Borr. Lich. Br. (1839) p. 148.—Thal- 
lus very thin, granulose, greyish or obsolete. Apothecia small, 
black; stipes short, usually somewhat stout; capitulum turbi- 
nato-cylindrical, white-pruinose at the margin; sporal mass gene- 
rally much protruded; spores ellipsoid, 1-septate, 0,007-14 mm. 
long, 0,004-7 mm. thick; hymenial gelatine frequently bluish with 
iodine.—Eng. Bot. t. 2503; Sm. Eng. Fl. v. p. 140; Mudd, Man. 
p. 257; Leight. Lich. Fl. p. 44, ed. 3, p. 43.—Calicium quercinum, 
subsp.curtwm Nyl.,Cromb. Lich. Brit. p.13. Phacotium curtwm Gray, 
Nat. Arr. i. p. 485.—Brit. Exs.: Leight. n. 133; Mudd, n. 248; 
Cromb. n. 110; Larb. Lich. Hb. nn. 83, 321; Bohl. n. 99. 
The most common of the British Calicie7, and often spreads extensively, 
though sometimes the thallus is evanescent. From C. guercinum it 
