_Camptosòrus_
Fruit-dots oblong or linear as in _Asplènium_, but irregularly scattered on
either side of the reticulated veins of the simple frond, the outer ones
sometimes confluent at their ends, forming crooked lines (hence, the name
from the Greek meaning crooked sori). Only one species within our limits.
_Camptosòrus rhizophyllus_
Fronds evergreen, leathery, four to eighteen inches long, heart-shaped at
the base, but tapering towards the apex, which often roots and forms a
new plant. Veins reticulated. The auricles of this species are sometimes
elongated and may even take root.
This curious and interesting fern is one of the finest for rockeries, the
tips taking root in rock-fissures. Shaded limestone, or sometimes other
rocks. Shapleigh and Winthrop, Me., rarely in New Hampshire (Lebanon),
and Connecticut, Mt. Toby, Mass., and western New England; also Canada to
Georgia and westward.
[Illustration: Walking Fern. _Camptosorus rhizophyllus_]