Glume a single scale-like bract with a flower in its axil. [Cyperaceæ], [567]
Glumes in pairs, of two sorts. [Gramineæ], [623]
Class III. CRYPTOGAMOUS ACROGENS. (See [p. 17.])
Subclass I. PTERIDOPHYTES: with woody fibres and vessels.
Spores of only one kind; spore-cases
Borne beneath shield-shaped scales in a terminal spike; stems naked, sheathed at the nodes. [Equisetaceæ], [675]
On the back or margin of fronds circinate in vernation. [Filices], [678]
Bivalvular, in special spikes or panicles; fronds erect in vernation, from short erect rootstocks. [Ophioglossaceæ], [693]
Solitary in the axils of leaves, 2–3-valved; low long-stemmed moss-like evergreens; leaves small, in 4–16 ranks. [Lycopodiaceæ], [695]
Spores of two kinds, large and small; spore-cases