plexis formata, gonidia strato peculiari versus superam thalli pagi- 
nam sub cortice disposita. Apothecia peltiformia vel lecanorina vel 
lecideina et gyrose contorta. 
Trib. X. Corniculariee. on 
Thallus rigidiusculus fruticulosus (seu exceptione unica filamen- 
tosus) vel saepius membranaceo-dilatatus, lobatus. Spermatia tenuia 
vel versus utrumque apicem obsolete crassiuscula vel versus alterum 
modo fusiformiter inerassata (tunc fusiformi-clavata forsan potissime 
dicenda). — Tribus Cetrarieis proxima, ab iisque forte haud separanda. 
Platysma Hoftm. pr. p. — Cornicularia Ach. em. char. 
Trib, XI. Peltigeree. 
Frons dilatata strato corticali in pagina infera deficienfe; apo- 
thecia peltiformia marginalia, ad paginam superam thalli aut inferam 
sita, vel in lamina frondis sparea, Sporae in illis fusiformi-cylindricee, 
in his biloeulares fuscae., 
Nephroma Ach. — Peltigera Hoffm. — Solorina Ach. 
. Trib. XH. Parmeliee. 
Thallus lobatus, varie divisus aut stellato-laciniatus, apothecia 
lecanorina (h. e. a thallo evidentius marginata quam in tribu prae- 
cedente) vixque nisi in formis degeneratis biaterina (h. e. margine 
thallino non cincta). 
Sticla Ach. — Parmelia Ach. — Physcia Fr. 
Trib. XUL Gyrophoree. 
Tkallus dilatatus, peltatus, umbilicato-adfixus, Apothecia lerideina 
simplicia vel gyrose plicata. 
Umbilicaria Hoffm. 
Series V. Placodew. 
Thallus e erusta consistens variae indolis (squamosa, radiata, 
granulosa, pulverea aut in infimis nonnumguam nulla) absque- strato 
ullo medullari medio e filamentis laxe eontesto, apothecia lecanorina, 
biatorina, lecideina, vel lirelliformia. Thallus raro hypophlaeodes 
(hypoxyleus vel hypolitheus); apothecia raro thallo omni destituta 
vel in alieno parasitica. 
Trib. XIV. Lecanoree. 
Apotheeia lecanorina, 
Lecanora Schär. (Placodium DC., Pannaria Del., Lecanora 
Ach. pr. p) — Dirina Fr. — Pyrenopsis Nyl, — Tüelotrema 
Ach, r - Phiyetis Wallr. 
Trib. XV. Leeidinee. 
Apothecia biatorina vel lecideina. 
Homalea Nyl.— — Biatora F r. — Gyalecta Ach. — Lecidea Fr 
