Originally Posted by poschiavanus
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