CAIJCIDM.] CATJCIKI. 9") 



This differs from the type in tlie upper portion or tho. entire lenptli of 

 the stipes being concolorous with tlie underside of the capitulum. It 

 is probably an accidental state. Leighton erroneously describes it as 

 having a whitish margin. 



Ilah. On decaying wood in njdand tracts. — Distr. Very rare and local 

 in AN'. England.— B. :M. : t'ricklade, A\'iltshire. 



Var. ft. xylonellum Nyl. 8yn. ii. (18G0) p. 155. — Capitulum 

 blackish, usually more globose, the margin inflcxcd, sometimes 

 brownish. — Cromb. Grevillea, xv. p. 14. — Calicium anjloiicUum Ach. 

 Meth. (1803) p. 92, Suppl. p. 14. Calicium sjyhwocephalam 

 ft. crustosum Turn, & Borr. Lich. Br. p. 153. 



Though looking distinct, this is only a yariety of C. trachcUnvm, 

 differing, amongst other minor and less constant characters, in the colour, 

 form, and coarctate margin of the capitulum. 



Hcih. On old pales in upland wooded tracts. — Distr. Very local and 

 scarce in E. and S. England, and (yfr/e Nyl. I.e.) in S.W."^Ireland. — 

 B. M. : Bury St. Edmund's, Suffolk ;' Stoney Cross, New Forest, Hants. 



13. C. parietinum Ach. Vet. Ak. Handl. 1816, p. 260, t. 8. f. 1 a, e. 

 — Thallus very thin, maculate, grejish- white, or none visible. 

 Apothecia minute, scattered ; stipes somewhat short, slender, 

 black ; capitulum lenticular or subturbinatc, blackish, sporal mass 

 compact; spores fusiformi-ellipsoid, simple, about 0,007-11 mm. 

 long, 0,003-6 mm. thick. — Cromb. Grevillea, xv. p. 14. — Calicivm 

 suhtile Mudd, Man. p. 258 ; Cromb. Enum. p. 13 ; Leight. Lich. Fl. 

 p. 44, ed. 3, p. 44. Caliciinn debile Eng. Bot. t. 2462 ; Turn. & 

 Borr. Lich. Br. p. 151 ; Sm. Eng. Fl. v. p. 141. Stroin/ifliinn 

 debiJe Gray, Nat. Arr. i. p. 484. — As it is extremely doubtful if 

 Calicium suhtih Pers. is this species, I have employed the name of 

 Acharius. — Brit. E.cs. : Leight. n. 314 ; Mudd, n. 247. 



The thallus, even when best developed, forms only a very thin, widely 

 spreading film, w^hich often becomes obliterated. The minute, scattered 

 apothecia, the slender stipes, the form of the capitulum, the rather com- 

 pact mazsedium, and the simple spores distinguisli 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 S. and N. Eng- 

 land. — B. M. : Henfield, Sussex ; Lyudhurst, 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 minutelhun Ach. Vet. Ak. 

 HandL 1816, p. 118, t. 5. f. 2. 



This differs from the type in the colour of the thallus, the constanth' 

 minute a])Othecia, and the colour of the underside of the capitulum. In 

 the only British specimen this last character is scarcely apparent. 



