274 



Exflanation of Plates. 



PLATE LVI. 



{A]\ Figures x 500 %inless otherwise stated.) 



TILLETIA, EXTYLOMA, SOROSPORirM. AND THECAPHORA. 



Fig. 



223. Barley grass, with TiUetia hordei concealed by the glumes : glumes removed on 



one side showing smut-balls . . . . . . . . . . nat. size 



224. Spores in surface view, showing net-like markings and gelatinous envelope. 



225. Spore germinating after 24 days in water, with one septate promycelium bearing 



7 conidia at its apex . . . . . . . . . . x 300 



226. Section through leaf of Melilotus indica, showing the spores of EntyJoma meliloti largely 



replacing the ordinary tissues . . . . . . . . X 170 



227. Spores of Sorosporium cryptum germinating after 41 hours floating on water. A — 



Non-septate promyceUum only ; B — Elongated non-septate promycelium bear- 

 ing a single stout 2-septate conidium at apex ; C — Septate promycehum with 

 lateral and terminal conidia, the terminal conidium giving off at the side a slender 

 septate germ-tube. 



228. Two spore-balls of Thecaphora leptocarpi . . . . .. . ■ X 250 



