species of Polypodium are recorded in Britain. All are native
and include Intermediate Polypody (P. interjectum), Polypody
(P. vulgare) and Southern Polypody (P. cambricum).The BSBI provide a downloadable plant crib forPolypodium.
1b > Leaf-miner: A long greenish linear mine, frequently following a vein;
mines can be up to 10 cm long. Pupation internal. Puparium whitish-yellow
with minute black spiracles, anterior spiracles projecting through
the leaf epidermis.
On Asplenium ruta-muraria, Ceterach, Phyllitis scolopendrium and Polypodium vulgare in Britain and in addition to these Asplenium
scolopendrium and Asplenium septentrionale and Ceterach
officinarum elsewhere. Widespread in Britain. Also recorded
in the Republic of Ireland. Widespread in much of Europe.
1c > Leaf-miner: Larvae usually feed on the underside of a fern frond under an untidy
mass of sporangia, but on occasion enter the leaf to make an extensive
irregular blotch mine (British
the larva lives free under the leaf, under an inrregular mass of
spun soredia and frass. The larva feeds on the sori, and larva betrays
its presence as a sorus on an unusual place. Sometimes also elongate
full depth blotches are made (Bladmineerders van Europa).
on Asplenium, Phyllitis, Polystichum and Dryopteris, but not yet on Polypodium, in Britain and Asplenium,
Ceterach, Phyllitis, Polystichum and Dryopteris elsewhere.
Widespread in southern England and Wales. Initially occurred mainly
near coasts, but it is increasingly recorded inland. Outside of
Britain and Northern Ireland, only recorded in Madeira.
1d > Leaf-miner: 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 (Bladmineerders van Europa).
on Asplenium, Ceterach, Phyllitis and Polystichum, but not yet on Polypodium, in Britain and Asplenium, Ceterach, Phyllitis, Pteridium and Dryopteris elsewhere. Widespread in Britain and continental