The orange-coloured blisters on the underside of the leaves are caused by a rust fungus, Puccinia smyrnii.
Puccinia smyrnii is a rust fungus that affects Alexanders, Smyrnium olusatrum. Both surfaces of the leaves, and the stem may be thickened and blistered by spermogonia and aecia, followed by dark brown telia on the leaf underside.
22 March 2019
Near Mill Hill
15 July 2017
Towpath at Old Shoreham (north of the Toll Bridge)
Some of the green seeds nearby may be the poisonous Hemlock Water Dropwort
Hill, north of Shoreham
14 December 2011
This plant, found on Mill Hill, but not very often on the downs elsewhere, is a host of so many insects that it has been allocated a page on its own.
Large black Ants and 7-spot Ladybird
What is it? It does not seem
to have long antennae like an ant.
Sepsid Fly (Diptera: Sepsidae)
There are twelve British species in the genus Sepsis
by Malcolm Storey (BioImages)
on the Bees, Wasps and Ants
Recording Society Yahoo Group and by
Will Atkinson on the British Insects Yahoo Group
orange-coloured blisters on the underside of the leaves are caused by a
rust fungus, Puccinia smyrnii.
Gardens Information File