411 
Arthonia meridionalis A. Zahlbr. nov. spec. 
Thallus epilithicus, crustaceus, uniformis, tenuissimus, 
irregulariter interruptus vel maculatim confluens, continuus, 
subfarinaceus, cretaceo-albus, KHO—, CaCl,O,—, sorediis et 
isidiis destitutus, in margine linea obscuriore non cinctus. 
Apothecia dispersa, minuta, 0:2—0'5 mm longa, rotunda vel 
rotundata, subplana vel leviter convexa; hypothecium crassi- 
usculum, fusconigrum; hymenium superne fusco-nigricans, 
inspersum, NO, in rufum vergens, caeterum fere decolor vel 
dilute fuscescens, J cupreo-cerasinum; paraphyses parum dis- 
tinctae; asci obovales, 28—40 w longi et 16—20 u latae, 
8spori; Sporae decolores, plus minus ellipsoideae, uniseptatae, 
cellulis fere aequalibus, 8-12 u longae et 5—61 latae. 
Pyenoconidia bacillaria, utrinque retusa, recta, ad 5°5 u. longa. 
Arthoniae calcicolae Nyl. proxima. Insula San Andrea, 
calcicola. 
Arthonia sexlocularis A. Zahlbr. nov. spec. 
Thallus hypophloeodes, crustaceus, uniformis, tenuissi- 
mus, effusus, laevigatus, lacteus vel leviter cinerascens, sub- 
nitidus, KHO lutescens, CaCl,0,—, sorediis et isidiis desti- 
tutus, linea obscuriore non limitatus. Apothecia fere immersa, 
dispersa, parva et tenera, subtoruloso-linearia, flexuosa vel 
survata, simplicia, bi- vel trifurcata, nigricentia, opaca, usque 
Imm longa et 0:1—0:15 mm lata, tumidula, nonnihil levis- 
sime albopruinosa, immarginata et planiuscula; hymenium 
superna nigricanti-sordidescens, KHO subviridescens, J e coe- 
“ulescente sordide obscuratum; paraphyses increbrae; asci 
ala ovales vel ovali-pyriformes, 8spori; sporae decolores, ob- 
onga vel dactyloideo-oblongae, rectae vel leviter curvatae, 
Juinqueseptatae, cellula secunda et quinta cellulis caeteris 
ongiore, 16—19 1. longae et 5-65 1 latae. 
Insula Busi, ad ramulos Pini halepensis. 
E grege Arthonia medusulae (Pers.) apotheciis linearibus 
enerisque et sporarum structura distincta. 
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