The Scott is Ji Naturalist. 307 



J. Grant, Brit. Asso. Report, 1885, in Abstract. Full report 



issued by the author. 

 Rev. H. E. Fox and F. Hanbury, Journal of Botany, 1885, pp. 



333"33 8 - 

 Dr. A. Davidson, Journal of Botany, 1886, pp. 23-24. 



F. J. Hanbury, I.e., 1S86, pp. 148-149; 1886, pp. 343-344. 



Rev. W. R. Linton, I.e., 1886, p. 377. 



Hanbury and Marshall, I.e., 1887. 



{To be continued.) 



LICHENS. 

 By Dr. J. STIRTON, F.L.S. 



WHILE overhauling some of my older collections of lichens 

 in search of duplicates, I came across a bundle picked 

 up in September, 1882, on the shores of Loch Rannoch. Amongst 

 these was one I had previously overlooked in my hurried search 

 for specimens. I was anxious to investigate this lichen, inasmuch 

 as its habitat was peculiar, viz., on huge boulders partly submerged 

 in the waters of the loch. Another peculiarity arrested my atten- 

 tion, viz., each fruit (apothecium) was snugly nestled in a small 

 smooth cavity of the stone, whose dimensions were very little 

 greater than those of the apothecium. Each apothecium was at- 

 tached to the bottom of the cavity by a central point, leaving the 

 rest of the under surface free. There was no appearance of a 

 thallus ; but an investigation of the margin and free black lower 

 surface of the apothecium revealed, under the microscope, traces of 

 a thalline structure, containing, inter alia, bluish gonimia, mode- 

 rate in size and globular or elliptical in outline, and either slightly 

 aggregate or scattered. No gonidia have been detected. As I 

 cannot recall any lichen whose external characteristics, as well as 

 internal organization, tally with this, I propose, meanwhile at least, 

 to elevate it to generic distinction under the name Cathisinia 

 concinna. 



Apart from the gonimia, this lichen might be classified amongst 

 the polysporous Lecanorce, and probably near one of the many 



