CATALOGUE OF BRITISH PLANT-GALLS 135 



angle. The alternate stage of the " pineapple " gall on 

 the Spruce. (Plate X. 7.) 



CHERMES STROBILOBIUS Kalt. 



Syn. Adelges sirobilobius 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 "witches 

 broom," often of large dimensions. 



Swanton, Haslemere Mus. Gaz., i., p. 53J. 



31 



32 



Nematoda 



Fungi 



ORAMINEAE 



Anthozanthum odoratum Linn. 112. Sweet Vernal 

 Grass. 



Stem abnormally thickened, short, bulbous near the 

 base. Leaf sheaths enlarged, with swollen and wavy 

 margin. Awn rudimentary or non-apparent. 



Tylenchus devastatrix Kiihn 33 



Connold, Plant Galls, p. igi. Houard, No. 169. 



Phleum pratense Linn. iii. Cat's-tail Grass. 



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 PersQon 34 



Massee, Textbook of Plant Diseases, p. 125. 



Agrostis cauiua Linn. loi. Brown Bent Grass. 

 Ovoid swelling on the stem, with a cavity opening below. 



ISOSOMA sp. 35 

 Trail, 1878. Houard, No. 194. 



Fusiform swelling on upper part of stem. See No. 34. 



Epichloe TYPHINA Persoon 36 

 Massee, Textbook of Plant Diseases, p. 125. 



Agrostis alba Linn. 112. Marsh Bent Grass. 



Leaves elongated, clustered, internodes slightly swollen. 

 Aphis yellow or shining black. 



Brachvcolus stellariae Hardy 37 



Trail, Aberdeen Nat. Hist. Soc. Trans., 1885. Houard, 

 No. 186. 



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. 



TYLENCHU.S TRITICI Bastian 38 

 Qonnold, Plant Galls, fig. i\. 39 



Hymen- 

 optera 



Fungi 



Homop- 

 tera 



