Page:Parsons How to Know the Ferns 7th ed.djvu/55

EXPLANATION OF TERMS

tered fronds. The fronds of the Brake are more or less solitary, rising from distinct and somewhat distant portions of the rootstock. The Botrychiums usually give birth to a single frond each season, the base of the stalk containing the bud for the succeeding year.

Fig. 1⁠Fig. 2⁠Fig. 3

A frond is simple when it consists of an undivided leaf such as that of the Hart's Tongue or of the Walking Leaf (Fig. 1).

A frond is pinnatifid when cut so as to form lobes extending half-way or more to the midvein (Fig. 2).

29