Fungus of Lolium. 2^7 



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 L.olinm 

 perenne^ 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) starchy endosperm; (a) aleurone layer; (el) epithe- 

 lial layer ; (h) hyphae in scutellum ; (h^) 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; (•^>. 

 constriction of hypha during penetration of cell wall. 

 X 1700 diam. 



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

 hyphae, 



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

 jjassing from one cell to the next ; (hi) hy])ha lying at a 

 different level, but drawn in the same i)lane 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. 



