LICHENES — DR JEAN MULLER. 373 



Socotra. Corticola. B.C.S. nn. 1312, 1313 pro parte, 1317 pro parte, 

 1318, 1337 pro parte. 



Distrib. Mediterranean region. 



2. D. cinerea, Mull. Arg. in Proc. Roy. Soc. Eclin. xi. (1882), 465. 



Thallus cinereus v. flavescenti-cinereus, madefactus virens, intus argillaceo-pallidus v. obscur- 

 atus et e flavescente et cinnabarino variegatus (non albus). Apothecia et sporee ut in D. 

 repanda, Fries, sed margo tenuior demumque subaurantiacus. 



Socotra. Ad saxa calcarea. B.C.S. n. 1463, 146Q pro parte. 

 Distrib. Endemic. 



var. sorediosa, Miill. Arg. in Proc. Eoy. Soc. Edin. xi. (1882.) 



Thallus sterilis soredia subhemisphserica circ. 1 mm. lata demum granuloso-efflorescentia gerens. 

 (Gonidia cum specie quadrant). 



Socotra. Ad saxa calcarea cum prsecedente. B.C.S. n. 1466 pro parte. 

 Distrib. Endemic. 



3. D. immersa, Miill. Arg. in Proc. Roy. Soc. Edin. xi. (1882), 465. 



Thallus tartareus, tenuis, laevis et continuus v. demum obsolete rimulosus, coerulescenti-cinereus 

 v. incanus, liuea torulosa iucrassata hypothallina cinctus. Apothecia omuino immersa et 

 prominentia thallina circulari cincta, demum a thallo plus minusve circumscisso-liberata, 

 J mm. lata v. paullo minora, demum vix distincte emergentia, liuea zeorina nigra prsesertim 

 statu madefacto perspicua cincta; epithecium fuscum, crassum ; lamina hyalina : hypo- 

 thecium eximie incrassatum, fuscum, in sectione verticali late obconicum, circumcirca 

 inter laminam et marginem thallinum in excipulum internum angustum lecideino- 

 nigricans adscendens. Asci 8-spori. Sporse oblongata?, utrinque, obtusae, 18-19 lk longae, 

 7-8 ix latse, hyalinse. 



Socotra. Ad saxa calcarea ubi cum D. cinerea, Miill. Arg. commixtim 

 provenit. B.C.S. n. 1322 pro parte. 

 Distrib. Endemic. 



var. sorediata, Miill. Arg. loc cit. 



Thallus sterilis minute sorediosus. A D. cinerea v. sorediosa, Miill. Arg. dignoscitur thallo 

 prsesertim statu madefacto coerulescenti-incano, nee cinereo-virente. 



Socotra. Cum forma fertili speciei ad saxa calcarea. B.C.S. n. 132'' 

 pro parte. 



Distrib. Endemic. 



