Holloway. — Prothalhis, &c, of Tmesipteris. 



403 



Three obliquely transverse sections through the shoot region — the third, 

 sixth, and ninth respectively from the one which first touches the top of 

 the embryo — are shown in figs. 52a to 52c. The apical cell appears in 



Fig. 49.— Embryo in longitudinal section, showing the apical cell and the main divisions. 



X 100. 

 Fig. 50. — Transverse section of the prothallus, giving the position of the embryo shown 



in fig. 49. A is the area in which rapid cell-division is taking place, and 



B is the fungal area. X 40. 

 Fig. 51. — Embryo in longitudinal section, showing apical cell and main divisions, x 100, 

 Figs. 52a-52c. • — -Three obliquely transverse sections from above downwards 



(Nos. 3, 6, and 9) through the epibasal region of an embryo. X 100. 



that marked A. What is probably the first inclined division in the 

 epibasal region appears in all three sections at aa, but an intersecting 

 octant wall could not be traced throughout the series. 



