Arthonia. 163 



Thallus tenuis aut tenuissimus, albidus aut rarius cinera- 

 scens vel violaceo-maculatus. Apothecia approximata et vulgo 

 etiam conferta, vulgo anguloso-rotunclata, aut clifformia, long, 

 vulgo circ. 0,5—0,2, raro 1 millim., crass. 0,3— 0,2'millim., disco 

 vulgo caesio-pruinoso, KHO solutionem violaceam effundentia. 

 Perithecium rubescens. Hypothecium dilute rubescens. Hyme- 

 nium jodo vinose rubens aut vulgo primum caerulescens. Epi- 

 fhecium albidum aut lividum aut livido-rubescens. Sporae de- 

 colores aut demum obscuratae, ovoideo-oblongae, 5 — 4-septatae, 

 long. 0,021—0,026 millim. [ — ,,0,oi8 iC millim.: Almqu., 1. c], crass. 

 0,0 7 — 0,0 9 millim., cellula apicali crassiore reliquis multo longiore. 



Var. tumidula Almqu., Mon. Arth. Scand. (1880) p. 21. 



Apothecia disco caesiopruinoso, margine einnabarino-prui- 

 noso. — Ad corticem arborum prope Rio de Janeiro frequenter 

 obvenit, n. 61, 116, 128, 200, 214, 414, 472, 499; etiam in Ca- 

 rassa (1400 metr. s. m.) in civ. Minarum lecta, n. 1367. Thallus 

 epiphloeodes, vulgo continuus, vulgo leviter inaequalis, opacus, 

 jodo solo haud reagens. Gonidia chroolepoidea, circ. 0,0 8 mil- 

 lim. crassa, membrana sat tenui. Apothecia praesertimque peri- 

 thecium solutionem violaceam effundentia, materiam rubram et 

 passim etiam violaceam continentia. Perithecium laterale, tenue, 

 rubescens, basi deficiens. Hymenium decoloratum aut dilutissime 

 rubescens, jodo intense (in n. 61) aut dilutissime (in n. 414) cae- 

 rulescens, demum vinose rubens. Epithecium KHO saepe oliva- 

 ceum. Paraphyses 0,oois millim. crassae, ramoso-connexae. Asci 

 oblongi clavative, apicem versus membrana incrassata. Sporae 

 8:nae, apicibus rotund atis obtusisve. 



Var. adspersa (Mont.) Wainio. Ustalia adspersa Mont., Lich. 

 Guyan. (1842) p. 278 (mus. Paris.). A. cinnabarina f. adspersa Nyl., 

 Syn. Arth. (1856) p. 89, Syn. Cal. (1868) p. 60, Lich. Nov.-Gran. ed. 

 2 (1863) p. 228. Arthonia adspersa Nyl., Lich. Nov. Zel. (1888) p. 119. 



Apothecia disco et margine caesio-pruinoso. — Ad corticem 

 arborum prope Rio de Janerio, n. 102 (n. 414 b in v. tumidu- 

 lam transiens). — Perithecium tenue, integrum, intense rubescens, 

 in margine strato tenui albiclo obductum. Hypothecium dilute 

 rubescens. Hymenium jodo vinose rubens. Asci ellipsoideo-cla- 

 vati. Sporae ovoideo-oblongae, 5— 4-septatae, decolores aut mor- 

 bose fuscescentes, long. 0,021— 0,024, crass. 0,007 millim., cel- 

 lula apicali crassiore reliquis multo longiore. 



