Pd f a 
fa 
~ Seed 

Fia. 424. Sporophyte of Pleris longifolia (x 5 
On the left is the tip of a young leaf which is unrolling (x 1); on the right, 
the under surface of a fertile pinna, showing sporangia aggregated near the 
sides (x 2) : 
. Lh AE a Oe ots p> 
| ET A LEO 
SEEPS = 
PSG 
Voge DTT} ] 
xz i i 
2 (% Ms 
OY a a see 
OY OR K a 
¢ 
iy 
5 
i 
ose, 
(S 
F 
DMX i PA 
ie ® Q bee 4 

Fig. 425. Section of a concentric vascular bundle of a fern (Davallia solida) 
Note that the xylem is surrounded by the phloém. (x 110) 
