1858.] THIRSK NATURAL HISTORY SOCIETY. 375 



OAK-LEAE FUNGUS. 



The small brown spots, observed by your correspondent '^S.B.^^ 

 on the under side of oak-leaves, are, in all probability, the pro- 

 ductions known by the name of " Oak Spangles," which are a 

 a kind of gall^ produced by an insect {" Diplolepis lenticularis") . 

 See Lindley's "^ Vegetable Kingdom/ page 31. 



The minute Fungi he observed on the under side of one of 

 these spangles may have been minute species of Peziza. Should 

 he discover any other specimens with these Fungi, I shall feel 

 greatly obliged by his sending me a leaf or two. 



Let me recommend to " S. B." and to " all others concerned" 

 (as the lawyers phrase it), the study of the Fungi. The multi- 

 tude and variety of forms assumed by these lower plants is almost 

 beyond belief, and their study, as it were, opens a new world to 

 the Phsenogamic botanist. I have only lately begun to study 

 the Fungij but find it a most interesting occupation. 



A. Jerdon. 



Mossburnford, Jedburgh; N. B. 



THIKSK NATUEAL HISTOET SOCIETY. 

 Botanical Exchange Club. 



The monthly meeting of the Thirsk Natural History Society 

 was held on the evening of Monday, the 1st of February. The 

 following botanists were duly enrolled as members of the Ex- 

 change Club, — 



Carrington, B. M.D., Teadon, West Yorkshire. 

 Gissing, T. W., Wakefield. 

 Lindsay, W. L., M.D., Perth. 



Mr. J. G. Baker read the following notices : — 

 Delphinium, — Amongst the plants that have effected a mi- 

 gration in the train of the Cereal^ Grasses, are a couple of species 

 of Larkspur, D. Consolida and D. Ajacis, which both seem to 

 have had their original home in the East, but which have both 

 become more or less definitively established in the cultivated 

 fields of several of the countries of the western portion of Europe. 

 According to the Floras, Consolida extends from Lapland south- 



