DES LICHENS. 13 
Erib. Xl. Peltigerer. 
Frons dilatatus, strato corticali in pagina infera deficiente; 
apothecia pelliformia marginalia, ad paginam superam thalli 
aut inferam sita, vel in lamina frondis sparsa. Spore in illis 
fusiformi-cylindricæ, in his biloculares fuscæ. 
Nephroma, Ach. — Peltigera, Hoffm. — Solo- 
rina, Ach. 
Trib. XII. Parmeliem. 
Thallus lobatus, varie divisus aut stellato-laciniatus, apo- 
thecia lecanorina (h. e. a thallo evidentius marginata quam 
in tribu precedente) vixque nisi in formis degeneratis bia- 
torina (h. e. margine thallino non cincta). 
Sticta, Ach. — Parmelia, Ach. — Physcia, Fr. 
Trib. XIII. Gyrophoreæ. 
Thallus dilatatus, peltatus, umbilicato-adfixus. Apothecia 
lecideina simplicia. vel gyrose plicata. 
Umbilicaria, Hoffm. 
Series V. PLACODER. 
Thallus e crusta consistens varie indolis (squamosa , 
radiata, granulosa, pulverea aut in infimis nonnumquam 
nulla), absque strato ullo medullari medio e filamentis laxe 
contexto, apothecia lecanorina, biatorina, lecideina, vel 
lirelliformia. Thallus raro hypophlæodes (hypoxyleus vel 
hypolitheus); apothecia raro thallo omni destituta vel in 
alieno parasitica. 
Trib. XIV. Eccanorce:e. 
Apothecia lecanorina. 
Lecanora, Schær. (Placodium, DE. — Pannaria, 
Del. — Lecanora, Ach. pr. p.) — Dirina, Fr. — 
Pyrenopsis, Nyl. — Thelotrema, Ach. — Phly- 
ctis, Wallr. 
