462 
Proceedings of the Royal Society 
rucae 1-3-carpicae, hemispbaericae, gibboso-subirregulares, ostiolum 
pallidum, tarcle nigrescens, modice depressum, asci (1-) 2-spori ; 
sporae 110-160 g longae, 45-60 g latae, intns valide subreticulatim 
costatae. — Ramulicola : B.C.S. et Scbweinf. 
Pertusaria socotrana, Mull. Arg. : thallus pallide cinereo-flavns, 
tartareus, rimoso-areolatus, areolae planiusculae, gibboso-inaeqnales, 
caeterum leves, verrucae 1-1 J mm. latae, hemisphaericae, regulares, 
v. ostiolis mammoso-gibbosae, 2-5 carpicae ; ostiola pallida, subclausa, 
impressa, demum mammoso-prominentia ; asci 4-spori; sporae 45- 80 
/x longae, circ. duplo longiores quam latae. — Ad saxa et calcarea 
et granitica vulgatissima : B.C.S. et Scbweinf. 
Pertusaria xantholeuca, Mull. Arg. : tballus ocbroleucus, 
rimosus, areolae planae v. concaviusculae, verrucae innatae, lecano- 
roideae, §-| mm. latae, albae, monocarpicae, discus late apertus, 
nigrescens, crasse albo-velatus, subplanus; asci 1-spori; sporae 
100-130 g longae et 53-60 p latae. — Graniticola : Scbweinf. 
LECIDEEiE. 
Blastenia albido-ccerulescens, Mull. Arg. : tballus cinereo- 
albidus, discreto-areolatus, areolae angulosae, planae, levigatae, in 
bypothalkr coernlescente sparsae ; apothecia vix J mm. lata, plani- 
uscula, nigro-marginata, discus rufus v. ferrugineo-fuscus, sjaorae 
orculiformes 11-13 g longae, 6-7 g latae. — Affinis B. polioterce , quae 
ibidem etiam obvia. — Ad saxa quartzosa : B.C.S. 
Blastenia cretacea, Mull. Arg. : tballus cretaceo-albus, farinu- 
lentus, tenuis; apotbecia J-J mm. lata, prominenter nigro-marginata, 
discus planus et rufo-nigricans, nudus ; epithecium coerulescens, 
sporae orculiformes 9-10 g longae, 5-6 g latae. — Affinis aegyptiacae 
B. melanocarpce Miill. Arg. — Calcicola : B.C.S. 
Blastenia variabilis, Mull. Arg. : tballus flavescenti-cinereus, 
continuus et levis ; ajaothecia mm. lata, primum laete fulva et 
margine crasso concolore cincta, mox j fuscescentia et margine 
tenuiore nigrescente praedita, demum fusca et tenuissime nigro* 
