264 
BRITISH GALLS 
FIG. 
14. Pluricellular hair from interior of gall of E. macrochclus. (\ 0 -.) 
15. Felt of hairs between the axils of the larger veins on the under 
surface of leaf of Acer pseudo-piatanus, caused by Phyllocoptes 
acericola. (f.) 
PLATE XIV 
Fagns sylvatica. The dense mass of twigs on the trunk are said to 
have arisen through the presence of a species of Eriophyes. 
PLATE XV 
Leaves of Achillea millefolium, with galls caused by the presence of 
Tylenchus millefolii. (ty.) 
PLATE XVI 
1. Stems of Veronicae Chamaedrys , with tumours resulting from the pre¬ 
sence of Sorosphaera veronicae. (L) 
2. Stem of Urtica dioica, with gall caused by Aecidium urticae, the aecidial 
stage of Puccinia caricis. (4.) 
3. Stems of Holcus mollis, galled by Epichloe typhina. ( 4 .) 
4. Stems of Alitiis glutinosa, galled by Frankiella aha. (4.) 
5. Section of a mass of tubercles. (4.) 
PLATE XVII 
Branch (dead) of Abies pectinata, with swelling bearing a "witch’s 
broom, ’’ caused by the presence of the aecidial stage ( Peridermium 
elatinum) of Melamfsora cerastii. 
PLATE XVIII 
Part of frond of Pteris aquilina, with the margins of the pinnules in¬ 
curved and thickened through the presence of the larvae of 
Perrisia filicina. 
PLATE XIX 
Branch of Juniperus communis , with gouty swelling consequent upon 
the attack of Gymnosporangium clavariaeforme. The bodies con¬ 
taining the teleutospores ot the fungus are growing upon the 
hypertrophied part of the stem. 
PLATE XX 
Betula alba, with numerous “ witches’ brooms ” caused by Eriophyes 
rudis. 
PLATE XXI 
1. Shoot of Prunus spinosa , with leaves galled by Eriophyes similis. (\.) 
2. Leaves of Alnus glutinosa, with galls caused by the presence of 
Eriophyes laevis. (4.) 
3. Section of gall of E. laevis. (f.) 
