CLAVIS 4 

 dispositionis Lichenum Europseoram. 



To yQttftfia anowcaivei, to Se nvsv/ua gmonoisi. 



Ord. I. GYMNOCARPI. Schrad. (p. 15). 



CHAR. Apothecia aperta, discifera. 



Trib. I. PARMELIACE^E* Discus subrotundus, 

 persistens, ab excipulo thailode marginatus. 

 (p. i5> 



A. Usneacece Eschw. Discus apertus. Thalhcs sub- 

 verticalis {aut pendulo-sarrnentosus) y centri- 

 petus, hypothallo destitutus* 



I. ITSNEA. Apothecia orbiculata, peltata ; discus apertus, 



strato fnedulJari fHamentoso impositus. — Stratum 

 thalli corticale a medullari jilamentoso secedens. 



Spec. n. 1. (p. i§. glauca). 



II. EVEB.NIA. Apothecia orbiculata, scutelliformia ; di* 



scus apertus, strato medullari floccoso impositus, co- 

 loratus — ThaLlus stuppeus, fistulosus aut stra- 

 to medullari fioccoso contiguo farctus. (p. 19). 



i. Cornicularice. Dec. fruticulosae (aut sarmcntosae) a- 

 poth. Jateralibus, Spec. fuscce* n. % 3* — ochroleu- 

 cce 4, 5. — citrina. 6. (p. 20—23) 



2* JDufoureoe. Ach. fruticulosae, inflatae, apoth. termi- 

 nalibus. Sp. ochroleucce n. J. & v £ (p. 24)- 



3. Physcice. Dec. foliaeeo-compressae, (fiiamentosas sem- 

 per steriles) subtus canalicul. Spec, glaucce 10, 11 

 — ochroleucce 8, 9- — citrince 12, 13» (p» 25 — 28.) 



III. RAMALINA. *) Apothecia orbiculata, scutelliformia rj 



*) Deest in Euvopa hujus sectio Corniculari^ sed tam hanc, 

 quam priorum generum species e scricbus cobris in Ettropa de~ 

 fyivntibus etftrueurop&as habemus. 



i 



