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Fic. 207. —A Fern (Aspidium Filizx-mas). 
1, general view of the plant; a, young fronds unrolling; 2, cross-section of the 
rootstock, showing fibro-vascular bundles, @ a; 3, a pinnule with fruit-dots ; 
a a, indusium ; 4, spore-cases ; 4, vertical section through 3 @; 5, vertical section 
at right angles to that of (4), showing: a, section of pinnule of leaf; b, section of 
indusium ; ¢c, spore-cases ; 6, a single spore-case, with its stalk, a, and its elastic 
ring, c, discharging spores at d. (lis reduced to about } natural size; 2, 3, are 
slightly magnified ; 4 is more magnified ; 5, 6 are considerably magnified.) 
