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Fern
Horisme tersata ([Denis & Schiffermüller], 1775)
Geometridae: Larentiinae
1782 / 70.127
Photo © Ian Walker,  31/07/2013 - Hilltop, Cley, Norfolk

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Similar Species
Cryptic Fern
Horisme radicaria
Forewing: 14-18mm.
Flight: One generation June-Aug.
Foodplant:   Traveller's-joy.
Red List: Least Concern (LC)
GB Status: Common
Verification Grade:  Adult: 2
Status
Local.
Calcareous soil habitats.

The Fern Horisme tersata, has now been split in to two species. The new Cryptic Fern Horisme radicaria appears to have been hiding in plain sight for a number of years. Extremely hard to separate and dissection required to confirm any potential specimens of Cryptic Fern. See next species.

Recorded in 37 (50%) of 74 10k Squares.
First Recorded in 1873.
Last Recorded in 2023.

Latest 10 Records
Date#VC10kArea
13/09/2023128TF74Holme NNR
08/09/2023128TF74Holme NNR
05/09/2023128TF74Holme NNR
04/09/2023228TF74Holme NNR
03/09/2023128TF74Holme NNR
01/09/2023128TF74Holme NNR
28/08/2023128TF74Holme NNR
26/08/2023128TF74Holme NNR
24/08/2023528TF74Holme NNR
22/08/2023128TF74Holme NNR
Further info: Horisme tersata
 
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