188 ( 37 ) 



simus, laevis, pulverulentus, hine iode coccineo-effloresccns ; 

 apothecia in genere ampla, ex orbiculari aut cuneato-subtrian- 

 gulari eximie anguloso-multiformia, platy-brachyloba, plana, 

 sicca fusco-nigra, ad angulos lamen rubescentia, madefacta 

 rufo-fusca; lobi latiores dianietro 2/3-I mm. aequantesj lamina 

 rufo-cinnabarina; epithecium rufo-fuscum; asci subglobosi, 

 8-spori; sporae 11-13 //. longae et S-6/x latae, late dactyloideae, 

 utrinque late rotundatae, (4-) 5-locuIares, loculus suramus 

 major, intcrmedii 3 reliquis breviores. — Affinis est A, gre- 

 garice Kovh., sed longe robustior et sporae e contra minores. 

 Prima fronte fere A. polymorpham Ach. refert, sed apothecia 

 baud nigra ct sporae ut in Arthonia Meissneri Miill. Arg. 

 Graph. Feean., p. 54. - Corticole : Terraba (Pitt, n^ 6211). 



i9i. Arthonia costaricensis Miill. Arg. Lich.Costar., 



1, 1)0 158. — Corticole: San Jose (Pitt. n° 6203). 



192. — somaliensii) Mull. Arg. Licli. Beilr., n° 96S. 



— Corticole : Terraba (n« 6210). 

 493. — rubella Nyl. Arth., p. 89. — Corticole : San 

 Jose (Pitt, no 6204), Boruca (no 6205). 



194. — farinalenta Miill. Arg. (sp. nov.). — Thallus albus, tenuis- 

 simus, conlinuus, farinulenlus; apothecia erumpentia, pri- 

 mum orbicularia, perexigua, quasi in maculas interrupto- 

 astroideo-ramulosas 1/2 ram. latas congesta, dein magis 

 confluentia et slatu aperto in unum astroideo-breviramuiosum 

 et angulosum ambitu suborbiculare abeuntia, nigra et opaca, 

 madefacta vix pcrspieue fuscescentia, intus olivacec-obscura; 

 asci oblongo-obovoidei, 8-spori; sporae anguste obovoideo- 

 fusiformes, circ. 15/^ longae et 4/* latae, 4-loculares, loculus 

 superior hand major. — Juxta A. palmicolam Ach. locanda 

 est. — Sur hois sec et demi-pourri : San Jose (Pitt, no 6207). 



1915. — subtecta Miill. Arg. (sp. nov.). — Thallus albus, subobsoletus ; 

 apothecia ex orbiculari oblongata, recta et curvata, integra 

 leviter lobato-ramosa, subangulosa, simplicia 1/2 mm. lata, 

 nigra, erumpentia, supra incomplete tantum a cellulis corticis 

 denudata el dein spurie obvelata; epithecium et hypothecium 

 olivaceo-fusca j asci 8-spori ; sporae 12-14/* longae et 8-6/* lalae, 



