[Illustration: Sori of Sensitive Fern]
| [Illustration: Sensitive Fern, Fertile and Sterile Fronds on one Stock Onoclea sensibilis (From the collection of Mr. and Mrs. L.P. Breckenridge)] | |
| [Illustration: Sensitive Fern. Onoclea sensibilis] |
[Illustration: Ostrich Fern. Onoclea Struthiopteris. Fertile Fronds]
(2) OSTRICH FERN
Onoclea struthiópteris. PTERETIS NODULOSA
Struthiópteris Germánica. Matteùccia struthiópteris
Fronds two to eight feet high, growing in a crown; broadly lanceolate, pinnate, the numerous pinnæ deeply pinnatifid, narrowed toward the channeled stipe. Fertile fronds shorter, pinnate with margins of the pinnæ revolute into a necklace form containing the sori.
[Illustration: Ostrich Fern. Sterile Fronds (New Hampshire)]