This small fist-like ball on the end of this fern frond is caused by a fly called Chirosia grossicauda. The larvae tunnel into the central veins of the pinnules in late summer and cause them to roll downwards from the tip. The solitary white maggot feeds on the main vein by mining. Mature larvae most likely pupate in their galls. Widespread and fairly frequent in Britain.
Photographs of Chirosia grossicauda taken June 2014, local woodland margin, Staffordshire. Β© Pete Hillman 2014. Camera used Nikon D3200, with Sigma 105mm macro lens.
A nice home for the fly, but not so swell for the fern!
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Indeed, Sandy. Home and food for the fly. Nature is so adaptable, and such a marvel.
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Absolutely. It’s amazing how well all the parts and pieces of the natural world fit together.
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Wonderful detail. It does look like a clenched fist.
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Thank you, Belinda π Yes, it reminds me of a clenched fist also.
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This is a new one for me, Pete, so I’ll need to keep a look out for it next year. Thanks for sharing.
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Thank you for your lovely comment, Sconzani π It was a new for me at the time, also.
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Wow! Amazing shot Pete! π
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Thank you, Jill π I am constantly amazed by the beauty and diversity of nature.
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Me too, Pete! πβ¨
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It makes you want to peel back the fingers and peek at what’s inside.
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π I guess you might not like what you found inside those frond fingers π
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How clever of them.
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π
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