Arthonia. 149 



palmellacea (pleurococcoidea, ut videtur, aut forsan chlorococ- 

 coidea) et membrana crassa instructa. Apothecia thallo innata 

 et saepe primum fragmentis thalli substrative obducta aut in ipsa 

 superficie thalK enata, immersa permanentia aut vulgo demum 

 emergentia adpressave, vulgo rotundata vel difformia breviaque 

 aut rarius elongata, disco aperto, immarginato aut raro tenuiter 

 marginato. Perithecium sokmi basale et ex hypothecio constans, 

 aut in latere (margineve) hymenii stratum tenue evanescensve, 

 ex hyphis conghitinatis contextum, formans, amphithecio nullo 

 obductum. Faraphi/ses ramoso-connexae, vulgo sokmi in reagen- 

 tiis conspicuae. Asci lati, obovati aut elhpsoidei oblongive, parte 

 superiore pachydermatici. Sporae 8:nae aut pauciores, ovoideae 

 aut oblongae aut ehipsoideae aut fusiformi-oblongae, 1 pluri-sep- 

 tatae, locuhs subcyhndricis, aut murales, decolores aut obscuratae, 

 jodo haud reagentes aut rarius leviter vinose rubentes. Pycno- 

 conidia ,,cyhndrica aut oblonga aut apicibus incrassatis instructa, 

 recta aut curvata, sterigmatihus simphcibus affixa aut pro parte 

 subsessilia" Linds., L c, Ahnqv., 1. c. p. 10, Nyl., 1. c). 



Subg. I. Arthothelium (Mass.) Wainio. Sporae murales. 



ArthGthelium Mass., Ric. Lich. Crost. (1852) p. 54; Koerb., Syst. Germ. 

 (1855) p. 293; Th. Fr., Gen. Heterolich. (1861) p. 98; Miill. Arg., Graph. 

 Feean. (1887) p. 4 et 65. 



1. A. aleurocarpa Nyl., Lich. Nov.-Gran. Addit. (1867) p. 

 340 (secundum descriptionem). 



TJiallus tenuis, glaucescens. Apothecia aggregato-confluen- 

 tia, difformia, lobato-dentata aut subramosa, long. circ. 40,7, 

 latit. 2-0,3 milhm., disco convexo', thalhim superante, albo, prui- 

 noso. Hypothecium albidum. Exoithecium albidum. Sporae 8:nae, 

 decolores, oblongae, murales, long. circ 0,iio 0,i40 mihim., 

 crass. 0,038 0,04o mihim. 



Ad corticem arboris prope Sitio (1000 metr. s. m.) in civ. 

 Minarum, n. 1019. Specimen originale Lindigianum non vidi- 

 mus, quare determinatio plantae nostrae non est satis certa. 

 Tliallus leviter inaequahs aut sat laevigatus, opacus, KHO (Ca Cl^ O^) 

 dihite aurantiaco-rubescens, jodo caerulescens, KHO non reagens. 

 Gonidia chroolepoidea, circ 0,oio 0,00 6 miUim. crassa, mem- 

 brana sat tenui. Apothecia partim thaUo obducta et in parte 



