174 REV, J. M. CROMBIE OK LICHENS 



Lecanora diffusilis, Ay/.,sp.n. Thallus albus vel albidus, ina^qualis 

 (crassit. circiter 0*5 millim.), rimosus (K +> yellow) ; apothecia nigra 

 lecideina innata immarginata (latit. 1 millim. vel minora), intus con- 

 coloria, saepe 2-4 confluentia et inde difformia ; spone ellipsoidese, 

 longit. O-009-O'OlO millim., crassit. 0*006 millim. ; lamina tenuis apo- 

 thecii tota sordide violascens. Spermogonia non visa. 



This species seems to belong to the section of L. atra. L. atro- 

 violacea, Flot. in Lechl. PL Maclov. 60, closely approaches. 



L. atrorimata, Nyl., sp. n. Thallus albus rugulosus rimoso-diffrac- 

 tus (crassit. circiter 0*5 millim.), rimis et ambitu nigris (K + , yellow); 



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apothecia nigra innata plana lecideoidea immarginata (latit. circiter 

 1 millim.), intus obscura; sporie 8nae incolores ellipsoidese simplices, 

 longit. 0012~0*015millim., crassit. 0006-0*008 millim.; lamina tenuis 

 apothecii violascens. Spermogonia non visa. 



Allied to the preceding species, but at once differing in the 

 nigro-rimate thallus and larger spores. In L. atroviolacea, Flot., 

 the rimflB of the thallus are not black. 



On rocks ; only two fragments gathered. 



L. psaromela, Nyl., sp. n. Thallus cinereus opacus tenuis sublievi- 

 gatus areolato-diffraetus expansus ; apothecia nigra (vel obscure fusco- 

 nigra), plana (latit. 8-1*6 millim.), margine thallino integro ciucta; 

 sporae oblongae vel fusiformi-oblonga3, longit. 0*010-0*015 millim., 

 crassit. 0*003-0*004 millim.; paraphyses non discretse; epithecium fus- 

 cescens. Iodo gelatina hymenialis cierulescens (dein thecal violacee 

 tinctae). Spermatia fusiformi-bacillaria, longit. 0*007-0*011 millim., 

 crassit. 0*001 millim. 



This species is most closely allied to L. psaropliana, Nyl. Obs. 

 Lich, Pyr. Or. p. 10, but differs especially in the plainer and darker 

 (almost black) apothecia, and in the spores being usually longer, 

 &c. 



On rocks ; very rare. 



L. xanthophana, Nyl. Add. Lich. And. Boliv. p. 379. 

 On rocks ; very sparingly gathered. 



L. SMARAGDULA (Wklflb.). 



On stones ; associated with other lichens, and only one or two squa- 

 mules seen in the specimen. 



Tribe Peutusariei. 



Pertusaria amara {Ach.), NyL 



On rocks ; only a single fragment present. 



P. Wawkeaxoidks, NyL, sp. n. Sat similis P. JVaicrean<P, Mass. 



