Species Details

ABH: 70.127

BF: 1782

Family: Geometridae

Subfamily: Larentiinae

Taxon: Horisme tersata

Authority: ([Denis & Schiffermüller], 1775)

Vernacular: Fern

Account: Common in open woodland and hedgerows, and on downland and calcareous grassland throughout much of southern England and Wales Characterised by streak on dorsum at one third, and streak on abdomen, which together form a single streak when the moth is in its natural resting posture, but see the recently discovered close relative Cryptic Fern H. radicaria which occurs in our area. Larva feeds on Traveller's-joy and Cultivated Clematis.

Accounts provided by and used with the kind permission of Mike Wall, Hampshire County Moth Recorder. These will in due course be gradually replaced with species accounts with a Surrey context.

Wingspan: 31 — 36 mm

Surrey Flight Period: 31 May (1953) — 7 Sep (2009)

The flight period of overwintering adults are not given. See the flight chart below the distribution map.

Foodplant: Clematis vitalba (Traveller's-joy).

Foodplant accounts are from the HOSTS database — Natural History Museum, London, UK. (CC0).

Status: Least Concern (LC)

UK BAP:

WCA:

Click here to view the full geology map of Surrey.

Verification Grade: 3 — Difficult to identify, an image may be required 🤔🤔
Further Information: https://www.ukmoths.org.uk/species/horisme-tersata/
Statistics

* Based on adult records only.

Records: 276

Individuals: 115

Earliest Year: 1902

Latest Year: 2024

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