CATALOGUE OF BRITISH PLANT-GALLS 135 
angle. The alternate stage of the “ pineapple ” gall on 
the Spruce. (Plate X. 7.) 
Chermes strobilobius Kalt. 31 
Syn. Adelges strobilobius Kalt. 
Burdon, Journ. Econ. Biol., 1908, ii., p. 126. 
Densely fasciated mass of twigs at the end of a branch, 
sometimes at the apex of the stem, forming a “witch’s 
broom,” often of large dimensions. 
32 
Swanton, Haslemere Mus. Gaz., i., p. 535. 
GRAMINEAE 
Anthoxanthum odoratum Linn. 112. Sweet Vernal 
Grass. 
Nematoda Stem abnormally thickened, short, bulbous near the 
base. Leaf sheaths enlarged, with swollen and wavy 
margin. Awn rudimentary or non-apparent. 
Tylenchus devastatrix Kuhn 
Connold, Plant Galls, p. 191. Houard, No. 169. 
Phleum pratense Linn. 111. Cat’s-tail Grass. 
Fungi Fusiform swelling immediately below the upper leaf 
sheath, white at first, becoming yellow at maturity. The 
presence of the fungus also causes abortion of the inflores¬ 
cence, and checks growth above the part attacked. 
Epichloe typhina Persoon 
Massee, Textbook of Plant Diseases, p. 125. 
Agrostis canina Linn. 101. Brown Bent Grass. 
Hymen- Ovoid swelling on the stem, with a cavity opening below, 
optera ISOSOMA sp. 
Trail, 1878. Houard, No. 194. 
Fungi Fusiform swelling on upper part of stem. See No. 34. 
Epichloe typhina Persoon 
Massee, Textbook of Plant Diseases, p. 125. 
Agrostis alba Linn. 112. Marsh Bent Grass. 
Homop- Leaves elongated, clustered, internodes slightly swollen, 
tera Aphis yellow or shining black. 
Brachycolus stellariae Hardy 
Trail, Aberdeen Nat. Hist. Soc. Trans., 1885. Houard, 
No. 186. 
33 
34 
35 
36 
37 
Nematoda Elongated swelling, about 5 by 3 mm., at the base of a 
leaf. Globular swelling about 2 mm. in diameter on the 
panicle. Greenish yellow, becoming reddish or purple. 
Tylenchus tritici Bastian 38 
Connold, Plant Galls, fig. 54. 39 
