170 KEY. J. M. CEOMBIE ON LTCHEN8 



Parmelia hottentotta, Ach. 



On trunks of trees, very sparingly, and infertile. 



Tribe Peltigeret. 



Peltigera canina (L.)« 



Amongst mosses on trees ; barren and not rightly developed. The few 

 imperfect fragments gathered seem referable to this rather than to any 

 other species of the genus, but can scarcely be rightly determined. 



Tribe Physciet. 

 Physcia flavicans (Sw.). 



On the branches of trees ; infertile. One specimen approaches in colour 

 to f. crocea, Ach. 



F. minor. Thallus small or almost minute, branches short, attenuated ; 

 apothecia small, chiefly convex; spores 0*01 1-0*015 millim. long, 

 0-006-0-009 millim. thick. 



On twigs ; very sparingly gathered. 



P. CHRYSOPHTHALMA (£•)• 



* 



On branches ; apparently not uncommon, and fertile. 



To this belongs entirely Tornabenia qfricana, Mass. Lich. Cap. 

 p. 84. 



P. FLAM ME A (L. fit-). 



On twigs ; fertile. 



The specimens, however, are from Little Namaqua Land; though 

 it is also met with at the Cape. 



P. PARIETINA (L.). 



On branches and twigs ; apparently common and fertile. 



F. aureola (Ach.). 



On the bark of trees ; probably common, though scarcely entirely 

 typical. 



P. leucomela * angustifolia, Mey. et Plot. 

 Amongst mosses on the ground ; sterile. 



P. affixa, Nyl., sp.n. Subsimilis P. obscurce, f. lithotea , sed tenuior, 

 magis adpressa et substrata agglutinato. Thallus castaneo-fuscus, 

 centro subgranulato-inaequalis areolato-diffractus, ambitu laciniato- 

 radians laciniolis incisis contiguis (latit. 0-2-O-3 millim.) ; apothecia et 

 spermogonia non visa. 



On rocks ; very sparingly gathered. 



P. setosa (Ach.). 



This does not occur typical, but only f. deminuta, with minute thallus 



and apothecia. 

 On rocks ; very sparingly, and only a single apothecium visible. 



