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Ferns and Horsetails (Monilophytes)
Clubmosses and Quillworts (Lycophytes)
Cystopteris fragilis  •  Brittle Bladder Fern
Cystopteris fragilis (L.) Bernh.; C.regia (L.) Desv.; Brittle Bladder Fern
Brittle Bladder Fern, Western Scotland (Main Argyll), June
Individual fronds, June (cultivated plant) Underside of individual fronds, June (cultivated plant)
Single frond, June (cultivated plant) The same frond flattened under glass to show form of pinnules
Detail of pinnules, June (cultivated plant) Close-up of pinnule showing vein endings, June (cultivated plant)
Underside of frond showing sori with whitish indusium. W Scotland (Main Argyll), early August Immature fronds. This plant has fairly broad segments. W Scotland (Main Argyll), early August
Young fronds. This plant has much finer segments. W Scotland (Main Argyll), early July W Scotland (Main Argyll), early July. Small plants can be confused with Woodsia alpina.
Finely dissected example. Cumbria, early July In a dry stone wall. Cumbria, late July
In dry stone wall. North Yorkshire, late July In dry stone wall. North Yorkshire, late July
In dry stone wall. North Yorkshire, late July In dry stone wall. North Yorkshire, late July
In dry stone wall. North Yorkshire, late July In dry stone wall. North Yorkshire, late July
In limestone pavement, Yorkshire, late July  
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