50 



strato medullari impositus. Thallus foliaceus, stellatus, adscen- 

 dtns. 



25. erinacea, (Ach.) Fr. (Borrera, Ach.) 



26. leucomtla, (L.) Ach. 



27. ct'/t'aro, (L.) Ach. 



28. delonsa, Fr. (P. Novse Anglise, Tuck, olim.) 



29. pulverulenta, (Schreb.) Wallr. (P. venusta, Ach.) 



30. hypoleuca, Muhl. 



31. speciosa, (Wulf.) Ach. 



32. aslroidea, (Clement.) Fr. 

 sideralis, (Fr.) 



/3 Clementiana, (Fr.) 



33. stellaris, (L.) Wallr. 



. stellari-expansa, (Fr.) (P. stellaris & aipolia, Ach.) 

 /8. hispida, Fr. (Borrera tenella, Ach.) 

 y. tribracia, (Fr.) (Lecanora, Ach.) 



34. ccesia, (Hoffm.) Ach. . 

 ft tenella, Fr. 



y squamulosa, (Fr.) 



35. obscura, (Ehrh.) Fr. . (P. cycloselis, Ach.) 

 /3. ulothrix, Fr. (P. ulothrix, Ach.) 



SECT. II. Thallus foliaceus membranaceus,deingranuloso-conglo- 

 batus. Hypolhallusjibnllosus matrici adnatuft. 



Sub-sect. III. AMPHILOMA, Fr. Excip. thallodes accessorium. 

 Tkallus platyphyllinus, submonophyllus. Hypothallus spongioso- 

 pannosus. 



36. Russellii, Tuckerm. Ms. 1 (P. plumbea, Auct. Amer. quo- 

 rund.) 



37. lanuginosa, Ach. . 



ft. granuloso-pulverulenta, (Fr.) 

 * Jeproso-byssina. (Lepraria incana, Auct. qu.) 

 Sub-sect IV. PSOROMA, Fr. Apoth. biformia: e squamulis orta 

 margine thallode ; ex hypothallo margine proprio. Thallus 

 minute squamulosus. 



38. micropkylla, (Sw.) Ach. 



39. triptophylla, Fr. (L. brunnea, Auct pi.) 



40. Hypnorum, (E. Bot) Fr. 



SECT. III. Thallus crustaceus, squamuloso-aut in ambitu fffiguratus. 



Hypothallus glaber. 

 Sub-sect V. PLACODIUM, Fr. Apoth. plano-scutellata, disco itn- 



marginato, nudo. 



41. straminea, Wahl. 



42. saxicola, (Poll.) Ach. 



43. chrysoleuca, (Sm.) Ach. 



44. orctna, Ach. 



45. elegans, (Link.) Ach. 



46. murorum, (Hoffm.) Ach. . 



/3 miniata, Fr. (Parmelia, Ach.) 



1 In honorem amic. inventoris, Rev. Job. Lud. Russell, Lichenum Nov. Ang. 

 illustratoris. 



