L1CHENES EXOTJCI. 259 



Trib. XIX. — LECIDEEI. 



Coeiiogoiiîiim Ehrnb. 



1. C. confervoides Nyl. — Ad ramulos, coll. Leperv.-Méz. n° 119. 



Byssocauloit Mnt. 



1. B. molliusculum (Fée sub Lecidea). - — Thallus albus vel albidus 

 mollis subtilissime leproso-byssoideus, sat tenuis (crass. fere 0,5millim.), 

 quasi granulatus et passim lobulato-crenatus, inœqualis ; apothecia rufa 

 vel infuscata convexa immarginata (juniora plana et pallidiora), demum 

 luberculosa, satis parva, intus concolora ; sporse 8 nie incolores simplices 

 oblongœ, long. 0,008-0,011, crass. 0, 00*25-0, 00/i millim., paraphyses 

 non distinctse, hypothecium non obscuratum. Gelatina hymenea (prsesertim 

 thecarum) iodo cœrulescens. — Ad cortices locis humidis in Insula Bor- 

 bonia, coll. Leperv.-Méz. n° 98. (Ad saxa in Insula Mauritii, ex hb. 

 cel. Fée.) 



JLccidca Ach,, Nyl. 



1. L. compacta Nyl. — Thallus ferrugineo-flavescens, e squamulis 

 constans crenatis adpresso-imbricatis confluentibus, satis tenuibus, mar- 

 gine paullo pallidioribus ; apothecia concolora vel rufo-rubescentia 

 mediocria convexiuscula immarginata, intus nonnihil pallidiora ; sporse 

 8 n " oblongo-fusiformes, long. 0,009, crass. 0,003 millim., paraphyses 

 non distinctse. Gelatina hymenea iodo cœrulescens. — In Insula Borbonia, 

 supra terram, ex hb. Lenormand. 



2. L. parvifolia (Pers.). — Ad cortices. 



3. L. microsperma Nyl.— Thallus sat tenuis (crassit. papyraceœ) 

 cano-virescens vel cano-cinerascens opacus obducens, tenuissime rugu^ 

 losus, ambitu in integris plicato-radiosus, summo ambitu sœpe albescens 

 vel leviter fuscescens byssinus; apothecia conferta carneo-rufescentia 

 vel luteo-rubellaj demum convexa, mediocria, intus albida ; sporae 8 n:r in- 

 colores parvse oblongse vel ellipsoidese, long. 0,005-7, crass. 0,003 millim. * 

 paraphyses médiocres, hypothecium incolor. Gelatina hymenea iodo cœru- 

 lescens. — Ad corticem arborum putrescentium locis humidis umbrosis, 

 ex coll. Leperv.-Méz. n° Z16. — Affinis est Lecideae canorubella3 Nyl., 

 sed major thallo paullum crassiore, apolheciis convexis, sporis minoribus. 

 Apothecia extus fere ut in L. vernali typica. 



h. L. Mauritiana Tayl. — Ad cortices, coll. Leperv.-Méz. n° h6; 



