Cynips disticha f. agamic

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Description

The agamic form is a small gall on the underside of oak leaves, often with a squared shape and a depressed central area.  The surface of the gall may have a mottled or bumpy surface, and is soft and pale brown at fIrst, later becoming harder and reddish-brown. Inside are two chambers, with the wasp larva in the basal chamber.   

Similar Species

Other Cynips galls on oak.

Identification difficulty
Recording advice

Provide photographs of the gall on the host plant and  a photo of the gall sectioned to show twin chambers. Note the host species.

Habitat

English/sessile oaks.

Further Information

See British Plant Galls (Redfern & Shirley, 2023).

  • Melinda Bell
    Swithland Wood,near big pit
    21 August 2024
    on oak leaf; squarish shape seen from side
  • sue
    Swainspark
    04 July 2024
    double chamber in gall
  • Melinda Bell
    Swithland Wood,near big pit
    21 August 2024
    2 chambers in gall
  • sue
    Swithland Wood, by Big Pit spoil mounds
    01 September 2023
    pale-brown, mottled gall on oak
  • sue
    Loughborough, the Outwoods, rocky outcrop
    25 August 2024
  • sue
    Loughborough, the Outwoods, rocky outcrop
    25 August 2024
  • sue
    Swainspark
    04 July 2024

Leicestershire & Rutland Map

MAP KEY:

Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2025+ | 2020-2024 | pre-2020

UK Map

Species data profile ?

Species profile

Common names
Two-cell Gall Causer
Species group:
insect - hymenopteran
Kingdom:
Animalia
Order:
Hymenoptera
Family:
Cynipidae
Records on NatureSpot:
5
First record:
01/09/2023 (Timms, Sue)
Last record:
29/09/2025 (Timms, Sue)

Total records by month

% of records within its species group

10km squares with records

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Latest images

Latest records

  • sue
    Swithland Wood, by Big Pit spoil mounds
    01 September 2023
    double chamber inside sectioned gall
  • sue
    Swithland Wood, by Big Pit spoil mounds
    01 September 2023
    gall on oak, square-ish shape