Aceria cephalonea


Aceria cephalonea is a mite that causes galls to form on the leaves of Sycamore. The galls are red, less than 3 mm high and have a rounded apex. The galls are seen more often than the mite.

Similar Species

Aceria macrorhyncha

Identification difficulty

Adult Gall

ID guidance

Only on Sycamore.  Aceria cephalonea galls are small - less than 3mm - and with rounded tips.  Aceria macrorhyncha galls are up to 6mm tall, and with pointed tips.  Intermediates do occur, and these can't be identified from the galls.

Recording advice

Some indication of the size of the gall is helpful, and a close-up photo.  The host plant should be specified in the comments - e.g "Gall on Sycamore, 3mm high"


On Sycamore

When to see it

Galls can be seen when Sycamore is in leaf.

UK Status

Widespread and fairly frequent in Britain.

VC55 Status

Fairly frequent in Leicestershire and Rutland.

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Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map