LICHENES — DR JEAN MXJLLER. 357 



PYXINK 



Pyxine, El. Fries Syst. Orb. Veg. 267; Stitzb. Beitr. 157; Tuck. Gen. 26. 



A genus of a few tropical or subtropical species, being a quasi-representation 

 of Physcia with lecideous apothecia. 



1. P. Meissneri, Tuck. var. endoleuca, Mull. Arg. L. B. n. 118. 



Soeotra. Ad truncos Aloes. B.C.S. n. 1563 pro parte. 



Distrib. In the southern hemisphere of both the old and new world. 



2. P. convexa, Miill. Arg. in Proc. Koy. Soc. Edin. xi. (1882), 460. 



Thallus ut in P. cocoes, Nyl., lsevis et intus similiter albus, sed laciniae unclique convexulae, nee 

 ultimae plano-concavae. Apothecia tenuius marginata, demuni convexa et subimmarginata, 

 plus minusve e nigrescente caesio-pruinosa; epithecium fuscum, nee virenti-fuscescens, et 

 minus evolutum, lamina fuscescens nee virens. Sporae a comparata specie non differunt. 



Eamulorum forma non est causa convexitatis laciniarum, Pyxines cocoes, Nyl. specimina enim 

 similiter ramulicola reliquis conformia sunt. 



Soeotra. In ramulis ssepe caespitibus Roccellce Montagnei, Nyl. subtecta. 

 B.C.S. nn. 1358 pro parte, 1359 pro parte, 1361 pro parte, 1365 pro parte. 

 Distrib. Endemic. 



Tribe 7. Placodie^e. 



Placodiece, Miill. Arg. Lich. Geneve 37. 

 Placodince, Korb. Syst. 110. 



An intermediate tribe between the Parmeliese and the Lecanorese. 



1. PLACODIUM. 



Placodium, Mass. Eic. 22; Korb. Syst. 114, Par. 53; Th. Fries Arct. 80; Heterol. 64; Miill. 



Arg. Licb. Geneve 37 (non Placodium, Nyl. ol.). 

 Squamaria, Nyl. ol. 

 Lecanorce, sp. Auct. 



A widely dispersed genus, chiefly represented in temperate and colder 

 regions, and in the mountains of tropical countries. 



1. P. bullatum, Miill. Arg. in Proc. Eoy. Soc. Edin. xi. (1882), 459. 



Tballus cinerascenti-albus, crassiusculus, bullato-areolatus, areolae alte convexse, subcontiguae, 

 lseves, periphericae breviter at distincte effiguratai, reliquis majores, planiusculae, longiores, 

 truncatse, apice crenatae et margine subrecurvo livido-discolores, omnes laeves. Apothecia 

 ut in Zecanora atra, Ach., crassa, albido-marginata, margo integer, discus niger, made- 



