CALICIUM. | CALICIEI, 95 
This differs from the type in the upper portion or the entire length of 
the stipes being concolorous with the underside of the capitulum. It 
is probably an accidental state. Leighton erroneously describes it as 
having a whitish margin. 
Hab. On decaying wood in upland tracts.—Distr. Very rare and local 
in W. England.—B. M.: Cricklade, Wiltshire. 
Var. 6. xylonellum Ny]. Syn. ii. (1860) p. 155.-—Capitulum 
blackish, usually more globose, the margin inflexed, sometimes 
brownish.—Cromb. Grevillea, xv. p. 14.—Calicium aylonellum Ach. 
Meth. (1803) p. 92, Suppl. p. 14. Calicium spheerocephalum 
B. crustosum Turn. & Borr. Lich. Br. p. 153. 
Though looking distinct, this is only a variety of C. trachelinum, 
differing, amongst other minor and less constant characters, in the colour, 
form, and coarctate margin of the capitulum. 
Hab. On old pales in upland wooded tracts.—Distr. Very local and 
scarce in E. and 8, England, and (fide Nyl. lc.) in S.W. Ireland. — 
B. M.: Bury St. Edmund’s, Suffolk; Stoney Cross, New Forest, Hants. 
138. C. parietinum Ach. Vet. Ak. Handl. 1816, p. 260, t. 8.f. 1 4, 8. 
—Thallus very thin, maculate, greyish-white, or none visible. 
Apothecia minute, scattered; stipes somewhat short, slender, 
black; capitulum lenticular or subturbinate, blackish, sporal mass 
compact; spores fusiformi-ellipsoid, simple, about 0,007-11 mm. 
long, 0,003-6 mm. thick.—Cromb. Grevillea, xv. p. 14.—Calicium 
subtile Mudd, Man. p. 258; Cromb. Enum. p. 13; Leight. Lich. Fl. 
p. 44, ed. 3, p. 44. Caliciwm debile Eng. Bot. t. 2462; Turn. & 
Borr. Lich. Br. p. 151; Sm. Eng. Fl. v. p. 141. Strongylium 
debile Gray, Nat. Arr. i. p. 484.—As it is extremely doubtful if 
Calicium subtile Pers. is this species, I have employed the name of 
Acharius.— Brit. Evs.: Leight. n. 314; Mudd, n. 247. 
The thallus, even when best developed, forms only a very thin, widely 
spreading film, which often becomes obliterated. The minute, scattered 
apothecia, the slender stipes, the form of the capitulum, the rather com- 
pact mazedium, and the simple spores distinguish it from its British 
allies. 
Hab. On the trunks of decorticated dead trees, and on old timber of 
outhouses in upland districts.—Distr. Local and rare in 8. and N. Eng- 
land.—B. M.: Henfield, Sussex ; Lyndhurst, New Forest, Hants ; Cleve- 
land, Yorkshire. 
Form minutellum Nyl. Syn. i. (1860) p. 159.—Thallus whitish. 
Apothecia minute, capitulum often greyish-suffused beneath.— 
Cromb. Grevillea, xv. p. 14.—Calicium minutellum Ach. Vet. Ak. 
Handl. 1816, p. 118, t. 5. f. 2. 
This differs from the type in the colour of the thallus, the constantly 
minute apothecia, and the colour of the underside of the capitulam. In 
the only British specimen this last character is scarcely apparent. 
