48 



V. CETRARIA, Ach. Fries. Apoth. oblique marginata, peltseformia, 



nuda. Thallus adscendens, sublus glaber. 

 1. Cartilagine &, Fr. suberectse. 



1. aculeata, (Ehrh.) Fr. (Cornicularia, Ach.) 



2. Islandica, (L.) Ach. . 

 y. crispa, Ach. 



3. Richardsonii, Hook. 



4. cucullata, (Bellard.) Ach. 



5. nivalis, (L.) Ach. 



2. Membranace(B,Fr. Depress, adscendentes. 

 a glauca, (L.) Ach. 



7. lacunosa, Ach. 



8. Tuckermanii, Oakes. 



9. ciliaris, Ach. 



10. sepincola, (Ehrh.) Ach. 



11. Oakesiana, Tuckerm. 



12. juniperina, (L.) Ach. 



13. pinastri, (Scop.) Sommerf. 



B. Parmeliea, Eschw. Discus clausus, dein discoideo-apertus. 

 Thallus horizontalis, centrifugus, hypothallo instructus. 



VI. SOLORINA, Ach. Apoth. subrotunda, laminae thalli adnata, ma- 

 culasformia, velata. Thallus coriaceo-membranaceus. 



1. crocea, (L.) Ach. 



2. saccata, (L.) Ach. 



VII. PELTIGERA, Hoffm. Apoth. antice thalli lobis producta, raro 

 margin! adnata. Thallus coriaceo-membranaceus, sublus venosus. 



1. Tno/acea, Ach. 



2. aphthosa, (L.) Hoffm. 



3. canina, (L.) Hoffm. 



4. rufescens, (Neck.) Hoffm. 



5. polydadyla, (Neck.) Hoffm. 

 ft. scutata, Fr. 



6. horizontal, (L.) Hoffm. 



7. venosa, (L.) Hoffm. 



VIII. NEPHROMA, Ach. Apoth. postica, thalli lobis adnata, reni- 

 formia. Velum nullum. Thallus subtus avenius. 



1. arctica, (L.) * (N. polaris, Ach.) 



2. resupinata, (L.) Ach. 



3. parilis, Ach. 



4. Helvetica, Ach. (N. nspera, Tuckerm.) 



IX. STICTA, Schreb. Ach. Apoth. nuclei instar infra stratum goni- 

 mon oriunda, dein prorumpentia disciformia, nuda, excipulo 

 thallode subdiscolori. Thallus frondosus, coriaceus, subtus vil- 

 losus, avenius, scepius cum cyphellis. 



1. aurala, (Sm.) Ach. 



2. crocata, (L.) Ach. 



3. sylvatica, (L.) Ach. 



4. anthraspis, Ach. 



5. quercizans, (Michx.) Ach. 



6. fuliginosa, (Dicks.) Ach. 



