Tribe XIV. STICTEI Nyl. Thallus large, membranaceo-lobed, 

 cyphellate or ecyphellate beneath; gonidial layer containing go- 

 nimia or true gonidia ; medulla woolly : apothecia lecanoroid or 

 parmeleine. 



Subtribe I. STICTINEI Nyl. Gonidial layer consisting of goni- 

 mia in plurilocular nodules. 



44. Stictina Nyl. Thallus rhizinoso-tomentose and cyphellate 

 beneath : apothecia lecanoroid, rarely parmeleine, usually with 

 septate spores ; spermogones innate, with jointed sterigmata and 

 apically incrassate spermatia. 



45. Lobarina Nyl. Thallus scrobiculose, ecyphellato beneath: 

 apothecia lecanoroid, with 3-septate spores ; spermogones as in 

 Stictina. 



Subtribe II. EUSTICTEI Nyl. Gonidial layer consisting of 

 gonidia or gonidimia (in Ricasolia). 



46. Lobaria Hoffm. Thallus scrobiculose, ecyphellate beneath : 

 apothecia lecanoroid, with 1-3-septate spores ; spermogones innate, 

 with jointed sterigmata and apically incrassate spermatia. 



47. Sticta Schreb. Thallus rhizinoso-tomentose and cyphellate 

 beneath : apothecia lecanoroid, rarely parmeleine, with variously 

 septate spores ; spermogones as in Lobaria. 



48. Ricasolia De Not. Thallus often entirely glabrous and very 

 rarely cyphellate beneath: apothecia parmeleine, with septate spores ; 

 spermogones in mastoid prominences, with jointed sterigmata and 

 apically thickish spermatia. 



Tribe XV. PELTIGEREI Nyl. Thallus frondosely dilated, 

 fragile ; cortical layer usually wanting on the lower surface ; gonidial 

 stratum consisting either of gonidimia or usually of gonimia: 

 apothecia peltifonn. 



Subtribe I. PELTIDEI Nyl. Thallus bearing cephalodia; 

 gonidial layer consisting of gonidimia : apothecia variously situated. 



49. Peltidea Ach. Thallus with the cortical layer not conti- 

 nuous on the underside : apothecia marginal on the upper surface, 

 with septate spores ; spermogones unknown. 



50. Solorina Ach. Thallus with the cortical layer not conti- 

 nuous on the underside: apothecia scattered and innate on the 

 upper surface of the thallus, with bilocular spores ; spermogones 

 unknown. 



Subtribe II. PELTIGEEINEI Nyl. Thallus destitute of cepha- 

 lodia ; gonidial layer consisting of gonimia : apothecia variously 

 situated. 



