2o6 YORKSHIRE NATTRALISTS' UNION. 



The mycelium of the fungus is perennial in the roots of the 

 host plant. 



1403. Ustilago hypodytes Fr. 



S.^^^ — Saltalre, on grass leaves (Lees' Fl.). 

 Mid W. — Bolton Woods, on Triticum repeus. 

 S.E.— Hall Bank, Beverley (R. H. Philip). 



1404. Ustilago avenge Jensen. [U. carlo Tul. : U~ 

 segetiim Ditm.] . 



N.E. — Scarboro' ; Buhner. Stokesley (Exc. '99), On 

 Avena sativa. Northallerton, on Arrheiiatlieriiiii avenaceiim. 



S.W. — Hebden Bridge on A. sativa. 



S.E.— Brough, on A. sativa (R. H. Philip). 



Mid W. — Stutton, near Tadcaster (H. T. S.). 



" Forming the black powdery mass in the inflorescence 

 of oats known as 'smut' or ' slean.' Known wherever oats 

 are cultivated, and before the simple but certain preventi\e 

 methods were discovered Swingle estimates the annual loss 

 due to this fungus at not less than 18,000,000 dollars for the 

 United States alone." (Mass. Text- Book of Plant Diseases).. 



1405. Ustilago hopdei Jansen. 



Common on cultivated barley ; forming a black mass in 

 the grain attacked ; not readily breaking up into black 

 powder like most species of Ustilago. (Mass. Text-Book 

 of Plant Diseases). 



1406. Ustilago grand is Fr. 



S.E. — Hornsea Mere, on Phragiiiitcs coniuiuuis (R. H. P.)> 



1407. Ustilago caricis (Pers.). 

 N.E. — Scarboro'. 



1408. Ustilago olivacea (DC). 



S.E. — Humber Bank, on Care.x riparia (R. H. Philip). 



1409. Ustilago bromivora ^^'aldh. 



S.\\'. — Hainworth ; Bradford; Shipley: (Lees' Fl.). 

 Lightcliffe (Fl. Hx.). On Bromiis mollis. 



1410. Ustilago scabiosse (Sow.). 

 N.E. — Scarboro'. 



Mid W. — -Hawksworth. 

 On Scahiosa arvensis. 



Trans. V.N.U., 1904 (pub. 1904). Bot. Series, Vol. 6. 



