204 FUNGOID PESTS OF CULTIVATED PLANTS. 



The same remarks apply to this species as to Gl&osporium nervisequum. 

 Known also in France, Belgium, Holland, and Italy. 

 Sacc. Syll. iii. 3717 ; Gvevillea, xiv. p. 124, No. 617. 



Two or three ordinary kinds of leaf-spot, caused by Phyllosticta or 

 Septoria, on Plane leaves have been recorded, but not yet as British. 



HOJRSE CHESTNUT LEAF-SPOTS. 

 Septoria Hippocastani (B. & Br.), PI. XIX. fig. 10. 



Common enough on the living leaves of Horse Chestnut in Britain, 

 but scarcely recognised elsewhere except in Italy. 



The spots are at first minute and scattered, then becoming confluent, 

 and forming broad rufous patches. Eeceptacles dot-like and scattered, 

 sporules, long, rod-like, curved and flexuous with divisions (55-60 x 3 //) 

 ejected in thin, delicate, pale tendrils. 



Presumably the Horse Chestnut trees are not much injured by this 

 leaf -spot, and we know of no remedies which have been applied. 



Sacc. Syll. iii. 2578 ; Berk. A.N.H. No. 434 ; CooJce, Hdbk. No. 1305. 



HOUSE CHESTNUT STEBEUM. 

 Stereum purpureum (Fries), PI. XIX. fig. 11. 



Several trees have been destroyed in Greenwich Park, the trunks of 

 which have borne this Stereum, and it has been contended that this fungus 

 has entered as a wound parasite and destroyed the trees. This should be 

 confirmed by experiment, as the same fungus has been credited with 

 causing " silver leaf " in stone-fruit trees. 



Sacc. Syll. vi. 7284 ; Cooke, Hdbk. No. 910 ; Mass. Fun. Fl. i. 132, 

 fig. 14 ; Journ. E.H.S. xxviii. p. xxii (1903). 



A leaf-spot (Phyllosticta Pavia Desm.) has been found occasionally in 

 this country on the leaves of ^Esculus indica syn. Pavia Mica. The 

 sporules are cylindrically elliptical, biguttulate (11-12 /* long). 



Known also in France and Belgium. 



Sacc. Syll. iii. 2 ; Grevillea, xiv. p. 71, No. 365. 



ELM-LEAF PHLCEOSPOBE, 

 Phleospora Ulmi (Fr.), PI. XIX. fig. 12. 



One of the commonest parasites on leaves of the Elm, sometimes 

 occupying nearly every leaf on a tree. The spots are small and brownish 

 on the under surface, over which the pustules are scattered. The conidia 

 are profuse, cylindrical, rounded at the ends, at first nucleate, and then 

 divided into five cells (55 x 6 /u), exuding from the orifice of the pustule in 

 whitish tendrils, and diffusing themselves over the surface of the leaf. 

 Known in older books under the name of Septoria Ulmi, and supposed to 

 be an early stage, or condition, of Phyllachora Ulmi. 



