16i MISSION DU CAP IIORK. 



discus nigrescens, leviter pulverulentus; sporse in ascis 1-2-nge, 

 cire. i8o l ''-2oo !i long*, 75^-80^ latte, ssepe anguste conico-obovoidese. 

 Thalli et apotheciorum rugis a proxime affinibus P. dealbata Nyl. et 

 P. monogona distat. Thallus nec Isevis nec isidioso-asperatus. Sporae 

 subinde ludunt in tus nigrescentes. 



Saxicola, Terre de Feu (Hariot); baie Orange, insula Hoste (Hariot, 

 n° 68), et Burnt island (Hariot, n° 41). 



Trib, XIII. LECIDINEjE. 



70. Lecidea (sect. Biatora) lividula Mùller Arg. 



Thallus cinereo- v. flavo-virens, minutissime granulosus, granula in 

 liypothallo nigro dispersa; apothécia ï=g- mm lata, plana, tenuiter et pro- 

 minenter marginata, discus siccus obscure fuscus, madefactus aquoso- 

 livido-pallidus; margo nigro-fuscus, madefactus paullo pallidior; epi- 

 thecium olivaceum; lamina cum hypothecio hyalina, mollis; paraphyses 

 liberse; sporse late ellipsoidese, 12^-1 7^ longse et j^-çf lata?. — Proxima 

 L. fuscellœ Mùller Arg. (Lichen. Beitr., n° 348), sed apothécia et sporse 

 minores, apothécia madida alia. 



Ad corticem Drimydis Winteri in insula Wollaston, Terre de Feu : 

 (Hariot, n° 36 pr. p.) et ad corticem Embotryi coccinei in insula Davv- 

 son (Hariot). 



71. Lecidea (Sect. Lecidella) epichlorotica Mùller Arg. 



Thallus albus, valde tenuis, e granulis confluentibus formatus et 

 sublsevis aut omnino continuus et lsevis, margine linea aut zonula 

 nigrescente cinctus; apothécia '^- mm lata, sessilia, subtenuia, plana, 

 nigra et nuda, margine tenui semper prominente cincta, madefacta in 

 disco mox pallescentia, intus pallida; epithecium virens aut cum peri- 

 thecio crassius atro-viride, lamina cœterum cum hypothecio vitreo- 

 hyalina et mollis; paraphyses conglutinatse; sporse in ascis 8-nse, 

 anguste cylindrico-ellipsoidese, utrinque obtusse, 1 S^-?.^ longa 1 , 5^6^ 



