CALICIUM | CALICIACEE 15 
Grevillea xv. p. 14 (1886). C. claviculare var. trachelinum Ach. 
Meth. p. 91 (1803). Coralloides fungiforme arboreum nigrum, vix 
crustosum Dill. Hist. Musc. p. 78, t. 14, fig. 3 a (1740). Mucor 
spherocephalus L. Sp. Pl. p. 1655 (1753)? Lightf. Fl. Scot. 
p. 1071? Lichen spherocephalus Web. Spicil. Goett. p. 198 
(1778)? Sm. Engl. Bot. t. 414 (1797). Phacotrum (Phacotium) 
spherocephalum 8. F. Gray Nat. Arr. i. p. 485 (1821). 
Exsicc. Cromb. n. 112 pro parte; Leight. n. 270; Mudd 
n. 246. 
Resembles the preceding in the reddish tinge of the apothecium 
(visible under the microscope as minute red granules), but easily dis- 
tinguished by the difference in the thallus. As in other species it is 
often more or less suffused by a yellowish Lepraria, which remains 
when the proper thallus has disappeared. In form hemipheum 
(errore hemiplodiwm), the whole stalk is more or less suffused with 
red, an unusual state. There has been much confusion over the 
identity of Mucor spherocephalus Linn., of which no specimen 
exists in the herbarium at the Linnean Society. Smith’s specimen 
described in 1797 certainly represents this plant. 
Hab. On the trunks of old trees and on palings in maritime and 
upland districts.—Distr. Not very general nor common ‘throughout 
the British Isles—B. M. New Forest, Hants; Lewes, Danny and 
Henfield, Sussex; Ulting, Thorndon Hall and Lea Bridge Road, 
Essex; Chedworth Woods, Gloucestershire; near Cricklade, Wilt- 
shire ; near Worcester; Pophills, Warwickshire; Earsham, Norfolk; 
Pen-y-law, near Oswestry, Shropshire; Ingleby Park and Kildale, 
Cleveland, Yorkshire ; Egglestone, Durham ; Leven’s Park, Westmore- 
land; Ben Lawers and Den of Dupplin, Perthshire; Mar Lodge, 
Braemar, Aberdeenshire; Castlebernard Park, Bandon, Cork. 
Var. xylonellum A. L. Sm.—Thallus very thin. Apothecia 
with a blackish, usually more globose capitulum, the margin 
inflexed, sometimes brownish. Calicium axylonellum Ach. Meth. 
p. 92; Suppl. p. 14 (1803). C. sphzrocephalum var. crustosum 
Turn. & Borr. Lich. Brit. p. 153 (1839). C. trachelinum vay. 
aylonellum Nyl. Syn. i. p. 155 (1860) ; Cromb. Monogr. i. p. 95. 
Hab. On old palings in wooded tracts.—Distr. Very local and 
searce in E. and $8. England and (fide Nyl. 1. c.) in Ireland.—B, M. 
Stoney Cross, New Forest, Hants; Penshurst, Kent; Bury St. 
Edmund’s, Suffolk. 
Capitulum whitish-pruinose. 
5. C. quercinum Pers. Tent. Fung. p. 59 (1797).—Thallus 
thin, granular, pulverulent or nearly smooth, greyish-white, or 
nearly. evanescent. Apothecia moderate in size, the stalk 
stoutish, black, the capitulum top-shaped-lentiform, at first 
white-pruinose, then naked, beneath grey-pruinose ; spores dark- 
coloured, small, l-septate, slightly constricted in the middle, 
5-9 » long, 3-5 thick.—Nyl. Syn. i. p. 155, t. 5. fig. 25; 
Mudd Man. p. 257; Cromb. Lich. Brit. p. 13 (excl. subsp. 
curtum) ; Leight. Lich. Fl. p 43; ed. 3, p. 43. C. clavellum 
