20 



Tilletia tritici (Bjerk.) ; but the well-known H-shaped conjugation of the 

 sporidia was not observed in this case. The similar specimen collected 

 in the vicinity of Tokyo was also obtained through the kindness of 

 Mr. S. Hori. A description of this species may be given as follows : — 

 Tilletia horrida nov. sp. — Spore-masses pulverulent, black, pro- 

 duced within the ovary and remaining covered by the glumes. Spores 

 globose, irregularly rounded, or sometimes brood-elliptical, the round 

 ones 18.5-23.0// in diameter and the elongated 22.5-26.0x18.0-22.0/; 

 in size. Epispore deep olive brown, opaque, thickly covered with con- 

 spicuous spines. The spines hyaline or slightly colored, pointed at the 

 apex, irregularly polygonal at the base, more or less curved 2.5-4.0 (J. 

 in height, and 1.5-2 a apart at their free ends. Sporidia filiform or 

 needle-shaped, curved in various mays, 10-20 in number and 38-53 fx 

 in length. Hab. On Oryza sativa L. From Tokyo and Kyoto. 



Botanical Laboratory, Sapporo Agricultural College, 

 Hokkaido, Feb. 25, 1896. 



EXPLANATION OF FIGURES. 

 Ustilaginoidea virens (Cooke.) (Figs. 1-8 incl.) 



Fig. I.-— A sporiferons body seen from different sides. After S. Hori, raagn. 2 times. 



Fig. 2- — A cross-section af the sporiferons body; a the outermost layer, b the middle, c 

 the innermost, d medulla, g remuants of the glumes, r remains of thick-walled cells of the 

 tissue of the fruit.. Magn. 3 times. B a port of the same section diagrammatically represented. 

 Magn. about 10 times. 



Fig. 3. — A ripe spores; B young spores in the middle layer. Magn. 880 times. 



Fig. 4. — Spore-bearing hyphse in the outermost layer. Magn. 8S0 times. 



Fig. 5. — Spore- bearing hyphse in the outermost layer, whose spores are not yet fully mature. 

 Magn. 880 times. 



Fig. 6. — Spore-bearing hyphae in the middle layer. Magn. 880 times. 



Fig. 7. — Cross-section of a part of the middle layer, showing the- arrangement of spore- 

 bearing hyphse. Magn. 380 times. 



Fig, 8. — Thin cross-section through the central portion of medulla. Magn. 880 times. 



Tilletia horrida, nov. sp. (Figs. 9-10 incl.). 



Fig. 9. — A a spore which had germinated in water ; B sporidia. Magn. 380 times. 

 Fig, io. — An immature spore with excessively developed spines. Magn. 380 times. 



