2o6 YORKSHIRE NATURALISTS' UNION. 



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

 host plant. 



1403. Ustilago hypodytes Fr. 



S.W. — Saltaire, on grass leaves (Lees' Fl.). 

 Mid W. — Bolton Woods, on Tviticum repens. 

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



1404. Ustilago avense Jensen. [U. carbo Tul. ; U. 

 segetum Ditm.] . 



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

 Avena sativa. Northallerton, on Arvhenathennn avenaceum. 



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 preventive 

 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 gpandis Fr. 



S.E. — Hornsea Mere, on Phragmites communis (R. H. P.). 



1407. Ustilago caricis (Pers.). 

 N.E. — Scarboro'. 



1408. Ustilago olivacea (DC). 



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



1409. Ustilago bromivora Waldh. 



S.W. — Hainworth ; Bradford ; Shipley : (Lees' EI.). 

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



1410. Ustilago scabiosoe (Sow.). 

 N.E. — Scarboro'. 



Mid W. — Hawksworth. 

 On Scabiosa arvensis. 



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



