The Scottish Naturalist. 213 



seems to be the first part attacked. The cells become less 

 regular in form, and lie with the long axis in any direction, and 

 are separated by wider interspaces. The next cells attacked are 

 the lower palissades, and the upper palissades soon follow, the 

 cells all resembling those of the loose mesophyll, without differen- 

 tiation of the tissues as in the healthy leaf. Neither epiderm nor 

 fibrovascular bundles undergo any noticeable change in structure. 

 The interspaces were well filled in August with eggs and young 

 worms ; but neither males nor females could be found, hence 

 there may be a doubt as to the maker of the gall being a Tylenchus. 

 These galls are common on the Links near Aberdeen, bnt I have 

 not found them associated with diseased Hyp. radicata, though 

 the plants are often common in the same spot. The galls on the 

 two are, however, so much alike that one may fairly enough 

 suppose them to be the work of the same species. 



HIERACIUM VULGATUM Fries :— 



On this plant I have found, near Aberdeen and near Dumfries, 

 galls so similar in every respect to the galls of Phytoptus on 

 H. Pilosella (and like these galls the work of Phytoptus) that I can 

 hardly doubt that they are the work of the same species of mite. 

 They differ from the galls described above only in their rather larger 

 size, and in absence of hairs and consequent greener colour. 



CAMPANULA ROTUNDIFOLIA L. :— 



a. Galls of Cecidomyia Campanula Muell., consisting of a 

 swollen fleshy bud or group of buds, that never develop fully 

 ("Sc. Nat." I., 187). 



b. Galls of Gymnetron Campanula:, consisting of swollen ovaries 

 (" Sc. Nat." I.e.) Both these galls are common in the district 

 near Aberdeen in July and August. 



c. Galls of a mite {Phytoptus), consisting of a very inconspicuous 

 inrolling upwards of the margin of the leaf, usually from base to 

 tip on each side, so as to form a roll or tube about 1 mm. in 

 diam., and slightly fleshy, but not differing otherwise in appear- 

 ance from other parts of the leaf. Inside the tube the mites may 

 be found. In July I found these galls in the neighbourhood of 

 Aberdeen, and in September in Rannoch in Perthshire. Mr. 

 Hardy, the well-known naturalist of Berwick, recorded the results 

 of his own observations on the work of mites in Berwickshire in 

 the Zoologist a number of years ago, including among them this 

 gall. It has also been recorded from Switzerland and from 

 Germany by Dr. Thomas (in Schweizer Milbengallen, 1872). 



