_Scolopéndrium_. PHYLLÌTIS
Sori linear, a row on either side of the midvein, and at right angles to
it, the indusium appearing to be double. (_Scolopendrium_ is the Greek for
centipede, whose feet the sori were thought to resemble. _Phyllitis_ is the
ancient Greek name for a fern.) Only one species in the United States.
[Illustration: Sori of _Scolopendrium vulgare_]
(1) _Scolopendrium vulgàre_