NS4274 : Ramsons Rust (Puccinia sessilis)

taken 1 year ago, near to Milton, West Dunbartonshire, Great Britain

Ramsons Rust (Puccinia sessilis)
Ramsons Rust (Puccinia sessilis)
The rust fungus is shown growing on Ramsons (Allium ursinum): see NS4274 : Rust fungus on Ramsons. For more on the plant species itself, see NS4373 : Ramsons (Allium ursinum) (taken elsewhere).

This fungus is common, but it was particularly abundant here (in the sense that plants seemed more heavily infected than usual) for a stretch of 100 metres or so alongside the cycle path.

For more context, see NS4274 : Cycle path crossing the Milton Burn; specifically, in relation to that picture, these plants were in the grass not far beyond and to the right of the point where the path crosses the burn.

The yellow patches on the leaves draw attention, but it takes a closer inspection, as in the present view, to reveal that each patch contains dozens of individual aecia (singular "aecium"; rust fungi have a complex life-cycle, and produce several different kinds of spore: the structures called "aecia" produce a particular kind called aeciospores).

These aecia are very similar in their individual appearance, although not in their manner of clustering, to those of the different rust fungi species shown in NS3679 : Gall on nettle and NS3678 : Leaf gall on Colt's-foot.

The rust fungus shown in the present picture is sometimes called Ramsons Rust, but another name for it is Arum Rust: that this is appropriate is made clear by TQ7818 : Arum rust on cuckoopint leaves, Churchland Lane, showing the same species on a different host plant.
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NS4274, 127 images   (more nearby )
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Date Taken
Sunday, 13 May, 2018   (more nearby)
Sunday, 27 May, 2018
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OSGB36: geotagged! NS 4278 7420 [10m precision]
WGS84: 55:56.1043N 4:31.1062W
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OSGB36: geotagged! NS 4278 7420
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EAST (about 90 degrees)
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Rust Fungus 

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