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Contributed by Smithsonian Institution Archives.
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Transcription
18.
D. Sori round or broad oblong
Fronds jointed to rootstock......Polypodium
DD. Sori narrow, straight or curved
E. Sori parallel to the midrib, continuous; frond
once or twice pinnate
Plants without trunk; fronds 8-18"...Blechnum
EE. Sori more or less oblique to midrib; fronds entire;
each sorus with one cover which opens from the
upper side.....................Asplenium
G. Trees bearing dry or pulpy fruit; shell of fruit
with three pores............Cocos nucifera L.