Page:Parsons How to Know the Ferns 7th ed.djvu/67

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GUIDE

GROUP II

FERTILE FRONDS PARTIALLY LEAF-LIKE, THE FERTILE PORTION UNLIKE THE REST OF THE FROND

[The species coming under the genera Botrychium and Ophioglossum may appear to belong to Group I, as the fertile and the sterile portions of their fronds may seem to the uninitiated like separate fronds, but in reality they belong to the one frond.]

5. ROYAL FERN

Osmunda regalis

Large. Sterile fronds twice-pinnate, pinnules oblong. Fertile fronds leaf-like below, sporangia in clusters at their summits. In wet places. P. 67.


6. INTERRUPTED FERN

Osmunda Claytoniana

Large. Sterile fronds once-pinnate, pinnæ pinnatifid. Fertile fronds leaf-like above and below, contracted in the middle with brown fruit-clusters. In wet places. P. 72.


7. CLIMBING FERN

Lygodium palmatum

Climbing, with lobed, palmate pinnæ and terminal fruit-clusters. Moist thickets and open woods. Rare. P. 75.


8. ADDER'S TONGUE

Ophioglossum vulgatum

Small. Sterile portion an ovate leaf. Fertile portion a slender spike. In moist meadows. P. 77.


9. RATTLESNAKE FERN

Botrychium Virginianum

Rather large. Sterile portion a thin, spreading, ternately divided leaf with three primary divisions; 1–2 pinnate. Fertile portion a branching fruit-cluster. In rich woods. P. 80.

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