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Leaf-mine:
Full-depth corridor or blotch, often positioned along the leaf margin.
In the first part much, brown-black, fine-grained frass, later parts
of the mine almost free from frass. After hibernation the larva
lives free in an untidy case of silk, covered with remants of sori
(Nederlandse
bladmineerders). The mine is illustrated in UKMoths.
Larva:
Larva (early and late instars) has black head, prothoracic plate
and anal plate, which distinguish it from the other fern frond species
P. filicivora
(UKMoths).
Pupa:
Pupal
case has sharp crest when unworn (UKMoths).
In the larval case, often on the hostplant (Pelham-Clinton, 1985a).
Hosts
in Britain:
Hosts
elsewhere:
Time
of year - mines: August-June, most prominent April-May (UKMoths).
Time
of year - adults: June-July (UKMoths).
Distribution
in Britain: Most frequent in Wales and W. England, including
Salop, Flint, Denbigh, Caernarvon (UKMoths),
East Perth, Mid Perth, North Devon and West Norfolk (NBN
Gateway distribution map - BRERC,
JNCC, NE
and SNH).
Distribution
elsewhere: Europe including Austria, Belgium, Czech Republic,
Hungary, Poland, Romania and Slovakia (Karsholt & van Nieukerken
in Fauna
Europaea).
Parasitoids:
Unknown.
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