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Old 24-04-2009, 09:02 PM
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Chris Yeates Chris Yeates is offline
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Location: Huddersfield, West Yorkshire
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Re: Fungal Plant Parasites

Originally Posted by poschiavanus View Post
Good thread Chris.
. . . [*]Oregon Grape. Mahonia rust Cumminsella mirabilissima. Look for leaves discoloured a darkish burgundy colour. Turn them over and the underside of the leaf will have a rusty felted appearance. . . .

A good one at this time Posch!

A North American species, Cumminsiella mirabilissima was first reported from Scotland in 1922 (near Edinburgh); the first published record from England was from Northumberland in 1930 (it had already been reported from Wales in 1926).

It is now widespread on Oregon Grape Mahonia aquifolium, and has also been recorded on M. bealei - I have never seen it on the latter. Posch's description is very good; here are uredospores and teliospores of this species - the long pedicels (stems) to the teliospores are very distinctive:

as regards the name - Cumminsiella mirabilissima - it's rather operatic I feel (try singing it to the tune of "La donna è mobile" from Verdi's Rigoletto)

YouTube - Luciano Pavarotti - La Donna È Mobile


"You must know it's right - The spore is on the wind tonight"
--Steely Dan, "Rose Darling"

Last edited by Chris Yeates; 24-04-2009 at 09:07 PM.
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