Prev Flights Rec Search
Cryptic Fern
Horisme radicaria (La Harpe, 1855)
Geometridae: Larentiinae
1782a / 70.1271
Photo © Graham Geen,  Mundford - 19/05/2020 - Possible candidate (Unconfirmed)

Tetrad Map
Google Map

Similar Species
Fern
Horisme tersata
Forewing: 14-18mm
Flight: May - July ?
Foodplant:   in Europe Traveller's-joy
GB Status: -
Former Status: Unknown
Verification Grade:  Adult: 4
Status
No confirmed Norfolk records.

The Fern Horisme tersata, has now (2019) been split in to two species in the UK. The new Cryptic Fern Horisme radicaria appears to have been hiding in plain sight for a number of years in Britain, with evidence from Europe suggesting that it is a recent/current colonist rather than a long-overlooked resident. Extremely hard to separate and dissection required to confirm any potential specimens.

Cryptic Fern has to date been confirmed on only a few occasions, the most recent being May 2020 in Kent.

Although dissection required, Cryptic Fern is noted in some specimens as lacking the dark discal spot of Fern and having a more pronounced clear black apical streak. [Ent. Rec. 131 (2019)] Cryptic Fern also appears to be on the wing a few weeks earlier then Fern in May. Please retain any potential specimens for determination. (Contact Jon Clifton)

A photograph, thought at the time to be of a Fern, taken at Mundford on 19 May 2020 (G. Geen) was recently submitted as a possible candidate. Although it is not possible to confirm from photo only, it does look like a possible Cryptic Fern, and it is now certainly worth checking and retaining any unusual specimens of Fern, as this species may be present in Norfolk. JW

Determination by Genitalia Examination Required

Latest 10 Records
Date#VC10kArea
Further info: Horisme radicaria
 
UK Moths
British Lepidoptera
NBN Atlas
Moth Dissection UK
Svenska fjarilar
Lepiforum.de
Bedfordshire Moths
Cambs Moths
Devon Moths
Dorset Moths
Essex Field Club
Hants Moths
Herts & Middx Moths
Huntingdon HMBG
Kent Moths
Norfolk Moths
Somerset Moths
Suffolk Moths
Upper Thames Moths
West Midlands Moths
Yorkshire Moths
Norfolk Moths (Full)
Back Record Home
iMoths V14.3 HD © Lepidoptera UK 2024
This web app requires necessary cookies to function correctly. We'd also like to set Google analytics cookies that help us make improvements by measuring how you use the site. These will be set only if you accept all cookies. Necessary cookies enable core functionality such as security, network management, and accessibility. You may disable these by changing your browser settings, but this will affect how the website functions. Cookies Policy