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Very rare in damp alkaline rock crevices in the mountains. Frond (including stalk) c 10-40 cm long. Lowest pinna c 2-7 cm long. ID: Like Brittle Bladder Fern but frond 3-pinnate, nearly 4-pinnate at the base. Lowest pinna much the longest, giving the whole frond a triangular shape. Fronds arise singly, not tufted. Few scales at stem base, like C fragilis and not like a Dryopteris species which is densely scaly there. Other features: Fronds arise in May from long slender creeping rhizome and die around September. Sori small and round, covered by a white toothed indusium that soon falls off. |
