Geometridae : Larentiinae
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Photo © Stuart Read,  10/07/2019

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Similar Suffolk Species: None
 
Fern
Horisme tersata

([Denis & Schiffermüller], 1775) 1782 / 70.127

Morley's Final Catalogue: Of frequent occurrence everywhere among clematis from Bures, Belstead and Bramford to Gorleston. Very rare at Monks Soham. Unnoted west of Bury.

Recent Suffolk Status: Scarce in east Suffolk, more common in the west. Seemingly becoming rarer in recent years.

Life history: Single-brooded.

Identification: The recently discovered Cryptic fern Horisme radicaria is very similar. Main differences are that Cryptic fern does not have a discal spot and has a longer more defined apical streak but these features are subtle and may be difficult to see on worn moths. Cryptic fern is also double-brooded so flies earlier and later in the year than Fern. Any candidate Cryptic ferns will have to be well photographed and kept for dissection to prove the record. Highly likely Cryptic fern will be found in the county in the near future as a probable was seen in Norfolk in 2020 but not confirmed by dissection.

Habitat: Woodlands, hedgerows, scrub, gardens.

Recorded in 37 (64%) of 58 10k Squares.
First Recorded in 1960.
Last Recorded in 2024.
Additional Stats

< Small Waved Umber | Pretty Chalk Carpet >

Determination
List Species Records   [Show All Latest]
Latest 5 Records
Date#VC10k Area
26/06/2024126TL94 - Lavenham/Boxford
22/06/2024126TL75 - Wickhambrook
21/06/2024226TL84 - Sudbury/Glemsford
18/07/2023126TL84 - Sudbury/Glemsford
02/07/2023125TM04 - Hadleigh
Show Details | 1990 to 2023 | 2000 to 2023 | Graph Key
Express Record Fern
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Copyright © Lepidoptera UK 2024
   
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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Forewing: 14-18mm.
Flight: One generation June-Aug.
Foodplant:   Traveller's-joy
Red List: Least Concern (LC)
GB Status: Common
Verification Grade:  Adult: 2
 Immature Adult   [Show Flight Times]
     
Underlying maps using Digital Map Data © Norfolk Online Lepidoptera Archive - NOLA™ - Suffolk 2024. © James Wheeler - Norfolk Moths 2007 - 2024. Data © NOLA™ - Suffolk 2024
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