National Geographic : 1925 May
THE NATIONAL GEOGRAPHIC MAGAZINE One-half natural size This fern is not fronds are blue-green, side and the marginal a ripe sporangium are SI© Painting by E. J. Geske MARGINAL FERN (Dryopteris marginalis) often found far away from loose rocks in rich, shady woods. The leathery, and evergreen. The pinna at lower right shows the under position of the sor. An enlarged sorus (fruit dot), with indusium, and shown above.