GLASGOW SOCIETY OF FIELD NATURALISTS. 211 



Additions to the Lichen Flora of South Africa 

 By James Stirton, M.D., F.L.S. 



The materials from which this paper has been elaborated have 

 been lying beside me for some time, but want of leisure, and, 

 more especially, want of authentic allied specimens with which 

 to compare some of the more critical species, have had mainly to 

 do in delaying my decision. As it is, I am still in doubt in one 

 or two instances, as the desiderata have not been secured. 



To Professor P. MacOwan of Gill College, South Africa, I am 

 chiefly indebted for the supply of specimens, generally in fine 

 condition, and, for the most part, in fruit. Dr. John Shaw, now 

 of Cape Town, and Mr. J. H. M'Lea, have also contributed from 

 other districts of South Africa, the former from the region of 

 the diamond fields, the latter from the neighbourhood of Port 

 Elizabeth. In addition, I have inserted the diagnosis of a curious 

 and unique species of Pannaria from the Bonny Eiver, in Western 

 tropical Africa, gathered by Mr. Grant, to whom, also, I am 

 indebted for many other species, several of which are new to 

 science. 



With three exceptions, all the new species are from Professor 

 MacOwan, the others are in common, unless where mention is 

 made to the contrary. 



Leptogium tremelloides (L.) 



Leptogium Hildenbrandii (Nyl.) 



Forma thallo subtus hine inde rhizinoso, alibi nudo et ruguloso. 

 Corticola. 



Leptogium Menziesii (Mnt.) 



Two forms. The one minutely rugulose above, the other 

 smooth, and, in part, glistening. 



Leptogium bullatum (Ach.) 



var. dactyHnoideum (Nyl.) 



