Links to genera Ferns and Horsetails (Monilophytes) Clubmosses and Quillworts (Lycophytes)
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| Gymnocarpium robertianum • Limestone Oak Fern
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| Gymnocarpium robertianum (Hoffm.) Newman; Thelypteris robertiana (Hoffm.) Slosson; Limestone Oak Fern
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| Frond. Cumbria, early July |
 | Frond. Cumbria, August |
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| Frond. Derbyshire, May |
 | Frond. Derbyshire, May |
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| Underside of frond showing mature sori. Cumbria, July |
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Mature sori showing individual sporangia. Cumbria, July |
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| Cumbria, July |
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Cumbria, early July |
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| Derbyshire, May |
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Derbyshire, May |
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| Cumbria, August |
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Cumbria, August |
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| Cumbria, early July |
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