LTCHENES— DR JEAN MULLER. 365 



6. P. socotrana, Mull. Arg. in Proc. Roy. Soc. Edin. xi. (1882), 462. 



Thallus pallide cinereo-flavus, mediocris, determinatus, satis minute riinoso-areolatus, areolae 

 planiusculae, gibboso-inaequales, caeterum lasves. Verrucas circ. 1-1^- mm. latae, hemis- 

 pbaericae, regulares v. ostiolis mamrnoso-gibbosse, laeves, 3-5-carpicae, rarius et 1-carpicae, 

 ostiola plus minusve exigua, pallida, subclausa, impressa v. demum mammoso-prominentia. 

 Asci 4-spori. Sporae uniseriales, oblongo-ellipsoideae, 45-80 /m longae, circ. duplo longiores 

 quam latae. 



Prima fronte cum californica P. flavicunda, Tuck., fere convenit, sed thalli areolae subplanae et 

 ostiola non in disculum latiusculum nigrum aperientia. Caeterum valde ludit forma et 

 magnitudine et superficie verrucarum interdum paullo cinerascentium. 



Socotra. B.C.S. nn. 1351 pro parte, 1355 pro parte, 1374, 1399, 1400 

 pro parte, 1403, 1406, 1407, 1437, 1442 pro parte, 1444 pro parte. Ad saxa 

 simul et calcarea et quartzosa in insula vulgatissima, in aclscensu Bagul, alt. 

 500 m. et supra Wadi Kischen, alt. 600 m. et 900 m. Schweinf. 



Distrib. Endemic. 



7. P. xantholeuca, Mull. Arg. in Proc. Roy. Soc. Edin. xi. (1882), 462. 



Thallus circ. J mm. crassus, determinatus, ocbroleucus v. e flavescente albellus, rimosus, areolae 

 planae v. concaviusculae. Verrucae innatse, lecauoroideae, leviter emergentes, §— f mm. latae 

 albae, monocarpicae ; discus late apertus, nigrescens, crasse pulveraceo-albo-velatus, sub- 

 planus, hinc inde tantum phlyctidioideo-perspicuus. Asci 1-spori. Sporae oblongatae, 

 100-130 M longae, 50-60 M latse. 



Juxta Pertusariam velatam, Nyl. et P. monogonam, Nyl. locanda est. Thallus fere ut in P. socot- 

 rana, Mull. Arg. sed multo altior et fructus diversissimi. Primo intuitu formam variolosam 

 refert et apothecia pleraque hoc statu tantum adsunt, alia tamen immixta fertilia sunt et 

 fere Plilydidis speciem simulant, sed verrucae, etiamsi nennissime, marginatae sunt. 



Socotra. Ad sexa quartzosa supra Wadi Kischen, alt. 900 m. Schweinf. 

 Distrib. Endemic. 



Tribe 9. Lecidee^e. 



Lecidecce, Mull. Arg. Lich. Geneve 50. 

 Lecideacece, Stitzb. Beitr. 158 pr. p. 

 Lecidinei, Nyl. Essai 181 pr. p. 

 Lecidinei, Tuck. Gen. 151 pr. p. 



A group of very numerous species, and represented in all countries. It is 

 quite analogous to the Lecanorese, and is divided in genera exactly on the same 

 principles, so that Lecidia corresponds to Lecanora, Patettaria to Lecania, 

 Blastenia to Callopisma, Buellia to Rinodina, &c. 



1. BLASTENIA. 



Blastenia, Mass. Syst. Lich. Blast. 13; Kbrb. Syst. 182; Th. Fries Heterol. 87; Mull. Arg. Lich. 



Geneve 62. 

 Placodium, Naeg. et Hepp, pr. p. ; Tuck. Gen. 105 pr. p. 



A smallish genus, widely dispersed. 



