SoS 
soles 
q CF iP 
Sree, dee eA 
Wes 
Fie. 204. Spore-Plant of a Fern (Aspidium Filix-mas). 
A, part of rootstock and fronds, not quite one-sixth natural size; fr, young 
fronds unrolling (not usually found at the same season as the mature 
fronds); B, under side of a pinnule, showing sori s; C, section through a 
sorus at right angles to surface of leaf, showing indusium i, and sporan- 
gia s; D, a sporangium discharging spores. (B is not far from natural 
size. Cand D are considerably magnified.) 
281 
