73 
AN ENUMERATION 
OF 
CULTIVATED EEENS. 
Order I. — FILICES. 
Fronds circinately unfolding, uniform and leafy, bearing 
sporangia on their under side or margin (rarely on both sides); 
or of two forms, one leafy and sterile, the other wholly, or some 
portion of its segments more or less contracted and fertile. 
Sporangia membraneous, one-celled, free, furnished with a 
vertical, horizontal, or oblique articulated elastic ring. 
Sub-Order I.— POLYPODIACEJE. 
Sporangia globose or oval, unilocular, pedicellate or sessile, 
membraneous, furnished with a vertical ring, and opening at a 
right angle to the direction of the ring. 
Division I. — Eremobrya. 
Fronds in vernation lateral, solitary, attached to the axis 
(rhizome) by a special articulation. 
* Sort mdusiate. 
Tribe I. — OLEANDREiE. 
Son round, medial. Indusivm lateral, interiorly attached or 
sometimes central, plane. 
