UMBILICUS.
Navelwort or Wall Pennywort. [Crassulaceae]
Only
one species of Umbilicus is recorded in Britain - Navelwort
(U. rupestris). It is a native species.
Only
one dipterous miner, the syrphid Cheilosia
semifasciata, is recorded on Umbilicus in Britain
and elsewhere.
One
non-dipterous leaf-miner is recorded on Umbilicus in Britain
(see below).
Navelwort
or Wall Pennywort - Umbilicus rupestris.
Key for the identification of the known Diptera mines in
Britain.
1>
Full depth mine; in parts of the mine the parenchyma remain untouched.
The larva enters and exits the leaf by means of an oval opening
of 3-5 mm at the base, near the leaf edge. Pupation external.
Mine
of Cheilosia semifasciata on Sedum telephium.
Image: Willem Ellis (Source: Nederlandse
bladmineerders)