16 CONIOCARPINEE [CALICIUM 
Turn. & Borr. Lich. Brit. p. 138 (1839); Hook. in Sm. Engl. 
Fl. v. p. 139; C. claviculare Ach. Meth. p. 90 (1803). Lichen 
clavellus Ach. Lich. Suec. Prodr. p. 83 (1798); Engl. Bot. 
t. 1465. Phacotrum (Phacotium) claviculare S. F. Gray Nat. 
Arr. i. p. 413 (1821). 
Exsice. Bohl. n. 95; Mudd n. 244. 
Frequently the thallus is but little visible; but the species may 
always be recognized by the grey pruina on the under side of the 
capitulum. The apothecia are frequent, and the spermogones usually 
abundant and crowded. 
Hab. On old palings and decayed trunks of trees.—Distr. Local 
and scarce throughout England and 8. Scotland; not recorded for 
Ireland.—B. M. Lyndhurst, New Forest, Hants; Hurst, Ardingly, 
Heathfield Park, Yapton and Henfield, Sussex; Hay Park, Ludlow, 
Shropshire ; Birkland, Nottinghamshire ; Lakenham, Norfolk ; Brants- 
dale and Baysdale, Cleveland, Yorkshire ; Hexham, Northumberland ; 
Falls of Clyde, Lanarkshire. 
Var. lenticulare Nyl. Syn. i. p. 156 (1860).—Thallus thin, 
granular-pulverulent, whitish, scarcely any, sometimes obsolete. 
Apothecia moderate in size, numerous, the stalk stoutish, black, 
the head dilated and rather flat or lens-shaped above, sometimes 
entirely naked ; spores as in the species or narrower, about 5—9 pw 
long, 3-4 » thick.—Subsp. lenticulare Cromb. Lich. Brit. p. 13. 
Calicium lenticulare Ach. in Vet. Acad. Handl. 1816, p. 262, 
t. 8, fig. 4. 
Exsicc. Cromb. n. 112 pro parte; Johns. n. 9. 
Distinguished from the species by the more lentiform head and 
less distinct pruina. 
Hab. On old oak palings.—Dist. Local and scarce in S. and W. 
England and in N. Wales.—B. M. Near Bovey Tracey, 5. Devon; 
Lewes, Sussex; Brockenhurst, New Forest, Hants; Baleombe and 
Shiere, Surrey ; Barmouth, Merioneth; Ennerdale, Cumberland. 
Subsp. curtiusculum Cromb. in Grevillea viii. p. 114 (1880), 
emend.—Thallus effuse, granulate, whitish or greenish-yellow. 
Apothecia black, the stalk very short, the capitulum lentiform, 
white pruinose at the margin; spores 6-10, long, 3°5-4°5 
thick. ©. ourtiusculum Nyl. in Flora Ixii. p. 360 (1879). 
C. quercinum var. lenticulare £. chlorodes Nyl. ex Cromb. in 
Grevillea xv. p. 14 (1886) and Monogr. i. p. 93. 
Exsicc. Larb. Lich. Hb. n. 82. 
Differs from the species in the almost sessile apothecia. The form 
chlorodes has similar apothecia with a somewhat brighter coloured 
thallus. 
Hab. On palings and bark of old firs.—Dist. Found only sparingly 
in S. and E. England.—B. M. Near Bovey Tracey, 8. Devon; near 
Lewes, Sussex; Shiere, Surrey; Epping Forest, Essex; Oakington, 
Cambridgeshire. 
6. C. curtum Turn. & Borr. ex Sm. Engl. Bot. t. 2503 (1813) 
& Lich. Brit. p. 148 (1839).—Thallus very thin, wide-spreading, 
