140 LICHENES. [Calicium. 



border. Ach. Syn. p. 59. Turn, and Burr. Lich. Br. p. 140. 

 Lichen hyperellus, Ach. — E. Bot. t. 1832. 



In the fissures of the bark of old trees, mostly upon oak, in Norfolk, 

 Suffolk, and Sussex. — The colour of the crust is as bright as in C. tigil- 

 lare, but the structure is different, ami the p)ilidia nearly resemble those 

 of the preceding species. 



8. C. chrysocephalum, Ach. (gold-headed Calicium); crust 

 granulated bright greenish-yellow, pilidia (obconical) stipi- 

 tate, capitulum slightly convex black with a thin elevated 

 yellow border, sporules brown with a tinge of orange colour. 

 Ach. Syn. p. 60. E. Bot, t. 2501. Turn, and Borr. Lich. Br. 

 p. 143. Schcer. Lich. Heir. p. 5. — Lichen chrysocephalus. Turn, 

 in Linn. Trans, v. 7. p. 88. t. 8. /. 1. 



On old pales, posts, and rails, Norfolk, Suffolk, and Sussex. — One of 

 the most beautiful of this very pretty genus, differing remarkably from 

 C. hyperellum, its nearest ally, in the form and especially in the colour of 

 the apothecia. 



9. C. phcEocephalum, Turn, and Borr. (brown-headed Cali- 

 cium); crust granulated dark-brown, pilidia shortly stipitate, 

 capitulum plano-convex brownish-black dotted with yellow 

 pruina particularly at the thin erect border, sporules dark 

 chestnut-brown. Turn, and Borr. Lich. Brit.]). 145. — C. s&picu- 

 lare, Ach. Lich. Un. — Licheti trabinellus, E. Bot. t. 1540, (excl. 

 syn.) — Lichen phaiocephalus, Turn, in Linn. Trans, v. 7. 

 p. 260. t. 6. 



On boarded buildings. Barns at Bruisyard, Suffolk. Lakenham, 

 Norfolk. Hurst Pierpoint, and Albourn, Sussex. — Very different 

 from any other British species of this Genus. The bright greenish- 

 yellow hue of the apothecia, arising from a kind of pruina or bloom, is 

 most conspicuous in a dry state and with the aid of the microscope. 

 The general colour of the whole plant is olive-brown, and it forms 

 widely extended patches. 



10. C. chloretlum, Ach. (small greenish-headed Calicium); 

 crust filmy very thin whitish, pilidia stipitate, capitulum ob- 

 conical covered with a yellow pruina, sporules olive -brown 

 covering the border. Ach. Syn. p. 60. Turn, and Borr. Lich. 

 Br. p. 146. — C. trachelinum, y. hispididum, Ach. Syn. p. 59. — 

 Lichen acicularis, E. Bot. t. 2385, (excl. syn.). 



On Elms and Oaks at Esher, Surrey, and Elms at Hurst Pier- 

 point, Sussex. Scotch Firs, near Bury St. Edmunds. — This has the 

 smallest and most inconspicuous pilidia of all our Calicia. The yellow- 

 green pruina is sometimes entirely rubbed off the capUulum t and the 

 whole pilidium is then of a dark dull brown, the usual colour of the 

 stipes; but sometimes the stipes is tinged with the green pruina. 



11. C. cm-turn, Turn, and Borr. (short-stalked Calicium); 

 crust very thin whitish, pilidia stipitate, stipes thickish upright, 

 capitulum subcylindrical obovate or hemispherical black, spo- 

 rules black forming a loose prominent mass and covering the 

 border. Turn, and Borr. Lich. Br. p. 148. E. Bot. t. 2503.—- 

 j3. populinum ; thallus white even, stipites slender, capi- 



