322 J. TlUtVt ET J.-E. PI, IN €11 ON (w. NYLANDEIt). 



Obs. — Sporse oblongo-fusiformes simplices, longit. mm ,007-0 mm ,0tl, 

 crassit. mm , 002-3. Lamina tenuis apothecii ochracea vel electrina, parte 

 média hypothecii obscuriore. 



4. Lecidea demutans Nyl. — Thallus albus tenuis vel tenuis- 

 simus subleprosus subdeterminatus ; apotheda testaceo-fusca 

 vel pallido-fuscescentia, margine nigricante vel tota nigricantia 

 (latit. circiter mm ,8) plana (margine tenui) vel convexula (mar- 

 gine demum excluso) ; sporse 8 ljœ incolores ellipsoideœ simplices, 

 longit. mm ,007-9, crassit. G mm ,0035-0 mi ",00/i5, paraphyses haud 

 discrets, hypothecium fuscum. Iodo gelatina hymenea cœru- 

 lescens. 



Hab. — Rio Negro, corticola, altit. 1200 metr. (coll. Lindig., UU). 



Obs. — Prope Lecideam fuscorubentem Nyl. locum habet. Lamina te- 

 nuis apothecii fere sicut in L. sanguineoatra, parte summa infera latera- 

 lique non infuscata. 



5. Lecidea trachona Flot, ex Zw., Exs., 117. — Thallus 

 albidusvel albido-cinerascens (vel interdum nonnihil virescens) 

 tenuis subleprosus vel minute granulosus, aut passim fere eva- 

 nescens; apothecia nigricantia, aut hinc inde sordide livido- 

 pallescentia (latit. mm ,o-0 mm ,5)plana immargiuata aut demum 

 convexula, opaca, sat conferta, intus obscura (vel dilutiora) ; 

 sporœ 8 nse incolores fusiformi-oblongee vel fusiformes 1 -3-septatse, 

 longit. mm , 011-19, crassit. mm ,0030-0 inilJ ,00Ô5, paraphyses sat 

 parcse apice incrassatute aut ese non bene cliscretae, hypothecium 

 infuscatum. Iodo gelatina hymenea cserulescens, deinde sordide 

 violacée tincta vel vinose rubescens. 



Hab. Honda, ad saxa arenaria et Andesitica, altit. 250 metr. (coll. 

 Lindig., 152). — Satis similis in Louisiana, ex hb. Tuckerman. 



Obs. — Epithecium subincolor (vel vage nonnihil fusconigrescens) 

 aut incolor. Hypothecium variât dilutius. Variant apothecia palle- 

 scentia. — Vix distinguere idoneum est varietatem chloroticoidem Nyl. 

 in Flora, 1 86^i, p. 620, cui thallus virescens sat tenuis granuloso- 

 subleprosus indeterminatus ; apothecia carneo-pallida vel dilute testa- 

 ceocarnea (latit. mm ,fr-0 mm ,6) convexiuscula immarginata, intus incolo- 

 ria ; sporae oblongo-fusiformes vel oblongo-attenuatae 3-septatse, longit. 

 mm ,011-0 mm ,019, crassit. mm ,0025-0 mm ,0035, hypothecium incolor, 



