EXPLANATION OP PLATES. 249 



Portion of same, showing arrangement of the pustules, 



X slightly. 

 Spores of banded smut {Ustilago grammicd) x 320. 

 Inflorescence of Scabious with Floret smut {Ustilago 



flosculornm) . 

 Eloret occupied by the smut. 

 Spores of Floret smut {Ustilago itosculorurn) x 320. 

 Sedge {Carex riparia) attacked oy Olive smut ( Ustilago 



olivacea). 

 Spores of Olive smut ( Ustilago olivacea) x 460. 

 Reed stem with smut {Ustilago typhoides). 

 Spores of Reed smut {Ustilago typhoides) x 320. 

 Leaf of Periwinkle with its rust {Trichobasis vinca). 

 Spores of Periwinkle rust {Trichobasis vinca) x 320. 

 Spores of Periwinkle brand {Puccinia vincce) x 320. 

 Leaf of Mercury with its rust {Uredo confliiens). 

 Spores of Mercury rust {Uredo confliiens) x 320. 

 Leaf of Enchanter's Niglitshade with its rust. 

 Spores of Nightshade rust {Uredo Circaa) x 320. 

 Leaf of Sorrel with Twin-faced rust {Uredo bifrom). 

 Pustule of Twin-faced rust seated on a coloured spot 



X slightly. 

 Spores of the same rust x 320. 



Leaf of Wheat with Corn rust {Trichobasis rubigo-vera). 

 Pustules of the same rust x slightly. 

 Spores of Round corn rust x 320. 

 Tuft of spores of Elongated com rust {Trichobasis 



linearis) magnified. 

 Spores 01 Elongated com rust {Trichobasis linearis) 



x320. 

 Leaf of Groundsel with its rust {Trichobasis Senecionis). 

 Spores of Groundsel rust {Trichobasis Senecionis) x 320. 

 Wild Rose with Golden rust {Uromyces Ulmaria). 

 Spores of Golden rust x 320. 

 Leaf of Vetch with Long-stemmed rust {Uromycet 



appendiculata) . 

 Spores of the same x 460. 



Leaf of Common thistle with Sweet-smelling rust {Tri- 

 chobasis suaveolens). 

 Spores of Sweet rust {Trichobasis suaveolens) x 320. 

 Spermogone of Sweet rust, from common thistle, 



X highly {De Bary). 

 Clover leaf with Short-stemmed rust {Uromyces apictt' 



losa) . 

 Spores of Short-stemmed rust x 320. 

 Leaf of Pilewort with its rust {Uromyces Ficaria). 

 Spores of Pilewort fust {Uromyces Ficaria) x 320. 



