Gary Fewless
Key to the Ferns
| 7. Fertile portion at the tip or middle of an otherwise sterile blade. | 8 |
| 7. Fertile portion on a branch diverging at
or below the sterile portion of the blade. In some species of Botrychium
the branching occurs near the ground, but the fertile branch does not
arise separately from a rhizome or caudex. |
10 |
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