BUELLIACEAE. 551 



2c. Caloplaca aurantiaca var. diffracta (Mass.) Eiddle. 



Callopisma aurantiacum var. diffractum Mass. Monog. Lich. Blast. 73. 

 1853. 



On limestone, New Providence, and Watling's Island, near Cockburn Town : — 

 Italy. 



The Bahama material agrees exactly with the specimen in Massalongo Lich. 

 Exsic. Ital. no. 2^3. 



Family 16. BUELLIACEAE. 



1. BUELLIA DeNot. 



Thallus areolate. even, medulla white. 

 Thallus yellow with caustic potash, 



Apothecia black and nudate. 1. B.parasema. 



Apothecia with an aeruginous bloom. la. B.parasemavar.aeruginascens. 



Thallus red with caustic potash. 2. B.conspirans. 



Thallus verrucose, the verrucae with a dark red 



medulla. 3. B.sanguinariella. 



1. Buellia parasema (Aeh.) Koerb. Syst. Lich. Germ. 228. 1855. 



Lecidea parasema Aeh. Meth. Lich. 35. 1803. 

 Buellia disciformis Auct. 



On bark, New Providence : — cosmopolitan. 



la. Buellia parasema var. aeniginascens (Nyl.) Muell. Arg. Flora 68: 530. 



1885. 



Lecidea disciformis var. aeniginascens Nyl. Bull. Soc. Linn. Norm. II: 2: 

 52. 1868. 



On bark, Ship Channel Cay and Stocking Island, Exuma Chain : — widely dis- 

 tributed in tropical America. 



2. Buellia conspirans (Nyl.) Wainio, Ann. Acad. Sci. Fenn. A: 6^: 88. 1915. 



Lecidea conspirans Nyl. Flora 51: 345. 1868. 



Lecidea sub disciformis Leight. Lich. Fl. Brit. 308. 1871. 



Buellia sub disciformis Wainio, Lich. Bres. 1: 167. 1890. 



On bark, common in many of the islands from New Providence to Long Island : — 

 widely distributed in the warmer regions. 



3. Buellia sanguinariella (Nyl.) Wainio, Lich. Bres. 1: 168. 1890. 



Lecidea saiiguinariella Nyl. Ann. Sci. Nat. V: 7: 328. 1867. 



On bark. Crooked Island, at Vauxhall and Jingo Hill : — Cuba ; Colombia. 



Family 17. PHYSCIACEAE. 



Hypothecium brownish-black. 1. Pyxine. 



Hypothecium colorless. 2. Physcia. 



1. PYXINE Fr. 



Apothecia lecanorine at least when young. 



Apothecia persistently lecanorine. 1. P. picta. 



Apothecia soon becoming lecideine. 2. P. Jileissnei-i. 



Apothecia lecideine from the first. 



Medulla white. 3. P. Cocoes. 



Medulla sulphury. 3a. P. Cocoes var. endoxantha. 



1. Pyxine picta (Sw.) Tuck. Proc. Amer. Acad. 4: 398. 1860. 



Lichen pictus Sw. Prodr. 146. 1788. 

 Physcia picta Nyl. Syn. Lich. 1: 430. 1858. 



On trees and shrubs. Great Bahama, New Providence, Cat Island, Watling's 

 Island : — widely distributed in warmer regions of both hemispheres. 



