244 ELEMENTS OF BOTANY 
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pi 
Fig. 171. Spore-Plant of a Fern (Aspidium jilix-mas). 
A, part of rootstock and fronds (not quite one-sixth natural size); fr, young 
fronds unrolling. 6, under side of a pinnule, showing sori, s. C, section 
through a sorus at right angles to surface of leaf, showing indusium, 7, 
and sporangia, s. 1, asporangium discharging spores. (B is not far from 
natural size. Cand D are considerably magnified.) 
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