Carpenter, William Benjamin, 1813-1885 · London : John Churchill · leaf 422
metimes naked onthe under surface of the fronds; but they are frequently coveredwith a delicate membrane, termed the indusium, which mayeither form a sort of cap upon the summit of each sorus, as inAspidium (Fig. 143), or a long fold, as ia Scolopendmm andPteris, or a sort of cup, as in Deparia… … Leaflet of Folypodium,with sori. 400 MICROSCOPIC STEUCTURE OP HIGHER CEYPTOGAMIA. more commonly spring from it by a pedicel or foot-stalk. Thewall of the capsule is composed of flattened cells, applied to each other by Il^- 142. their edges; but ^^,, there is gene- • -^---^ rally one row of these,…
Microscopy
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