CALICIUM.] CALICIEI. 93 



Form 1. ch.lorod.es Nyl. ex Cromb. Grevillea, xv. (1886) p. 14. 

 Thallus effuse, thinnish, granuloso-leprose, greenish-yellow. Apo- 

 thecia small, scattered ; stipes short, black. 



The colour of the thallus, if not abnormal, would render this a very 

 distinct variety. The apothecia are smaller and usually more slender 

 than in var. lenticulare, but in other respects quite similar. 



Hab. On old pales in upland tracts. Distr. Found only sparingly in 

 E. and S. England. B. M. : Epping Forest, Essex ; near Shiere, Surrey ; 

 near Bovey Tracey, S. Devon. 



Subsp. C. curtiusculum Nyl. Flora, 1879, p. 360. Thallus effuse, 

 granulate, whitish. Apothecia black ; stipes short ; capitulum len- 

 tiform, white-pruinose at the extreme margin ; spores 0,006-10 

 mm. long, 0,0035-45 mm. thick. Cromb. Grevillea, viii. p. 114. 

 Brit. Exs. : Larb. Lich. Hb. n. 82. 



As indicated by Nylander (/. c.), most probably a subspecies of C. quer- 

 cinum, differing in the short stipes and in the marginal pruina. The 

 apothecia, sometimes nearly sessile, are numerous and crowded. 



Hab. On bark of old firs, and on pales in shady lowland tracts. 

 Distr. Local and scarce in S. and E. England. B. M. : Near Lewes, 

 Sussex ; Oakington, Cambridgeshire. 



10. C. pusillum Florke, Deutsch. Lich. (1815) n. 188. Thallus 

 maculate, greyish or whitish, obsolete or none. Apothecia small, 

 entirely black, the stipes slender; spores 1-septate, 0,005-0,010 mm. 

 long, 0,0025-0,005 mm. thick. Nyl. Syn. i. (1860) p. 157 ; Cromb. 

 Journ. Bot. 1882, p. 272. 



Looks like a minute variety of C. quercinum, but is constant to its own 

 type. Analogous modifications occur in almost all the other species, 

 though usually on the same plant as their types. The very few British 

 specimens have the thallus obsolete and apothecia minute and scattered. 



Hab. On decorticated firs in wooded situations. Distr. Extremely 

 local and scarce in S. Ireland. B. M. : Deer Park, Castleniartyr, co. 

 Cork. 



11. C. curtnm Turn. & Borr. Lich. Br. (1839) p. 148. Thal- 

 lus very thin, granulose, greyish or obsolete. Apothecia small, 

 black; stipes short, usually somewhat stout; capitulum turbi- 

 nato-cylindrical, white-pruinose at the margin; sporal mass gene- 

 rally much protruded ; spores ellipsoid, 1-septate, 0,007-14 mm. 

 long, 0,0047 mm. thick ; hymenial gelatine frequently bluish with 

 iodine. Eng. Bot. t. 2503 ; Sm. Eng. Fl. v. p. 140 ; Mudd, Man. 

 p. 257 ; Leight. Lich. Fl. p. 44, ed. 3, p. 43. Caliciwn quercinum, 

 subsp. curium Nyl., Cromb. Lich. Brit. p. 13. Phacotium curium Gray, 

 Nat. Arr. i. p. 485. Brit. Exs.: Leight. n. 133; Mudd, n. 243; 

 Cromb. n. 110; Larb. Lich. Hb. nn. 83, 321 ; Bohl. n. 99. 



The most common of the British Caliciei, and often spreads extensively, 

 though sometimes the thallus is evanescent. From C. quercinum 'it 



