136 



BRITISH GALLS 



Fungi 



Hymen- 

 optera 



Acari 



Fungi 



Homop- 

 tera 



Fungi 



Diptera 



Fungi 



Agrostis tenuis Sibth. {vulgaris With). 112. Fine 

 Bent Grass. 



Fusiform swelling on the stem. See No. 34. 



Epichloe typhina Persoon 



Massee^ Textbook of Plant Diseases, p. 125. 



Ammophila arenaxia Link. 64. Mat Grass. 



Haulm thickened at the summit, where the intetnodes 

 are shortened, "the imbricated leaves are often not larger 

 than the enlarged sheath, the whole forming a pyriform 

 mass. _ Larva pupates in the gall, imago appears the 

 following April or May. 



ISOSOMA HYALIPENNE Walker 



Syn. Eurytoma hyalipennis Walker. 



Connold, Veg. Galls, pL 41 ; Plant Galls, fig. 155. 

 Houard, No. 211. 



Haulm swollen at the sheath ; the epidermic cells hyper- 

 trophied and assuming various shapes, usually either 

 looped or twisted like a gimlet ; hyaline at first, becoming 

 brownish. M. G. 



? Tarsonemus spirifex Marchal 



Connold, Plant Galls, fig. 156. Swanton, Knowledge, 

 June, 1910. 



Deschampsia caespitosa Beauv. 112. Tufted Hair 

 Grass. 



Fusiform swelling on the stem. See No. 34. 



Epichloe typhina Persoon 

 Holcus mollis Linn. 1 10. Creeping Soft Grass. 



Leaves erect, tufted. They "embrace each other at 

 their bases like those of a sedge. In this manner a kind 

 of boat is formed for the protection of the colony." Aphis 

 yellow or shining black, mealy. 



Brachycolus stellariae Hardy 



Hardy, North Brit. Agriculturalist, pt. ii., p. 788. 

 Buckton, ii., p. 148. Houard, No. 218. 



Fusiform swelling on the stem. See No. 34, and Plate 

 XVI. 3. 



Epichloe typhina Persoon 



Massee, Textbook of Plant Diseases, p. 125. 



Holcus lanatus Linn. 112. Meadow Soft Grass. 



Swelling on the stem in the immediate vicinity of a 

 node, under the sheath of the corresponding leaf, tinted 

 vid'let or purple. Larvae white, gregarious. 



Mayetiola holci Kiefler 



Whitehead and Gray's Report, 1887. Houard, No. 215. 



Fusiform swelling on the stem. See No. 34. 



Epichloe typhina Persoon 



Massee, Textbook of Plant Diseases, p. 125. 



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