158 
simus, laevis, pulverulentus, hinc inde coccineo-efliorescens; 
apothecia in genere ampla, ex orbiculari aut cuneato-subtrian- 
gulari eximie anguloso-multiformia, platy-brachyloba, plana, 
sicca fusco-nigra, ad angulos tamen rubescentia, madefacta 
rufo-fusca; lobi latiores dianietro 2 / 3 -I mm. aequantes; lamina 
rufo-cinnabarina ; epithecium rufo-fuscum; asci subglobosi, 
8-spori; sporae 11-13 /a longae et S-6// latae, late daclyloideae, 
utrinque late rotundatae, (4-) 5-locuIares, loculus summus 
major, intermedii 3 reliquis breviores. — Affinis est A, gre- 
gariœ Korb., sed longe robustior et sporae e contra minores. 
Prima fronte fere A. polymorpham Ach. refert, sed apothecia 
baud nigra et sporae ut in Arthonia Meissneri Miill, Arg. 
Graph. Feean., p. 54. — Corticole ; Terraba (Pitt. n° 6211). 
191. ârthonia coslaricensîs Miill. Arg. Lich. Costar., 
I, no 158. — Corticole : San José (Pitt, n® 6203). 
192. — somaliensis Miill. Arg. Lich. Beitr., n® 965. 
— Corticole : Terraba (n® 6210). 
193. — rubella Nyl. Arth., p. 89. — Corticole : San 
José (Pitt, n® 6204), Boruca (n° 6205). 
194. — farinnlenta Miill. Arg. (sp. nov.). — Thallus albus, tenuis- 
simus, continuus, farinulentus; apothecia erumpentia, pri- 
mum orbicularia, perexigua, quasi in maculas interrupto- 
astroideo-ramulosas 1/2 mm. latas congesta, dein magis 
confluentia et statu aperto in unum astroideo-breviramulosum 
et angulosum ambitu suborbiculare abeuntia, nigra et opaca, 
madefacta vix perspicue fuscescentia, intus olivaceo-obscura ; 
asci oblongo-obovoidei, 8-spori; sporae anguste obovoideo- 
fusiformes, circ. 15/x longae et 4 /a latae, 4-loculares, loculus 
superior baud major. — Juxta A. palmicolam Ach. locanda 
est. — Sur bois sec et demi-pourri : San José (Pitt. n® 6207). 
195. — spbtecta Müll. 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 et dein spurie obvelata; epithecium et hypothecium 
olivaceo-fusca ; asci 8-spori ; sporae 12-14/a longae et 5-6/a latae, 
