Fungus of Lolium. ■ 297 



Fig. 3. — A transverse section of the extreme proximal end of the 

 grain. Letters as before, and (r) radicle; (ht) hyphae in 

 fused pericarp and testa. 



Fig. -4:. — A longitudinal section of a grain of Lolium perenne 

 taken in the coronal plane. Letters as in Figs. 1-3, and 

 (g) growing point of embryo; (1) sheathing leaf. 



Fig. 5. — A longitudinal section of a grain of Lolium perenne 

 taken in the sagittal plane, (m) embryo; (v) vascular 

 bundle of scutellum; (i) ligule; (ht) hyphae in fused peri- 

 carp and testa. 



Plate XIX. 



The following figures have been drawn from sections of a grain 

 of Lolium perenne (South Africa). The fungus is especially 

 luxuriant, its intra-cellular nature being evident in the mature 

 grain. 



Fig. 1. — A sagittal longitudinal section of a grain of Lolium 

 jjcrenyie, not passing through the median line. The 

 scutellum shows numerous hyphae, which have gained 

 entrance to this tissue from any point on its surface. 



(e) stai'chy endosperm; (a) aleurone layer; (el) epithe- 

 lial layer ; (li) hyphae in scutellum ; (li^) hyphae round 

 periphery of the scutellum; (c) cells invaded by the 

 hyphae. x 250 diam. 

 Fig. 2. — Detail of the scutellum. 



(h) hyphae passing through the scutellar cells; (c; 

 constriction of hypha during penetration of cell wall. 

 X 1700 diam. 

 Fig. 3. — Aleurone cells, showing- the intra-cellular cour.se of the 

 hyphae, 



(a) aleurone cells; (w) wall of aleurone cell; (h) hypha 



jiassing from one cell to the next; (h^) hypha lying at a 



different level, but drawn in the same plane in figure. 



X 1700 diam. 



Fig. 4. — Detail of scutellum, showing the cells invaded by hyphae. 



X 1100 diam. 

 Fig. 5. — Wall of aleurone cell, showing hypha entering into cell 

 through pit in its wall 



(p) pit in wall; (h) hypha. x 1100 diam. 



