Tranzschelia discolor and T pruni-spinosae?

Plant diseases
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JennyS
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Tranzschelia discolor and T pruni-spinosae?

Post by JennyS » Fri Oct 27, 2017 9:34 pm

;) Sorry Chris!
I think I have found both Tranzschelia discolor and T. pruni-spinosae on Prunus over the last month, images of both below,

Tranzschelia discolor - teliospores with upper cell verrucose, lower cell smaller, paler and +/- smooth
w-Tranzschelia-discolor-190923-024b-Prunus.jpg
w-Tranzschelia-discolor-170923-13-teli,-uredo.jpg
w-Tranzschelia-discolor-170923-14.jpg
Tranzschelia pruni-spinosae - teliospores with both cells similar colour and both verrucose
w-Tranzschelia-pruni-spinosae-17102414.jpg
w-Tranzschelia-pruni-spinosae-171024-2.jpg
w-Tranzschelia-pruni-spinosae-171024-4.jpg
Jenny

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Chris Yeates
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Location: Huddersfield, West Yorkshire

Re: Tranzschelia discolor and T pruni-spinosae?

Post by Chris Yeates » Sat Oct 28, 2017 5:28 pm

Here is a collection on Prunus spinosa; look at the range of teliospores - taking note of those at top right (both cells same dark colour) and then some of the others with the lower cell very pale.
The situation can't be helped by the variability of the hosts and the wide occurrence of the hybrid: https://www.brc.ac.uk/plantatlas/plant/ ... -fruticans - those clusters sure imply areas with people who know how to recognise the hybrid rather than discrete occurrences.
Perhaps I'll do some detailed collecting next year, taking note of characters of the host (especially leaf dimensions), and see if there consistent differences.
Chris
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"You must know it's right, the spore is on the wind tonight"
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JennyS
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Posts: 91
Joined: Wed May 13, 2015 6:08 pm

Re: Tranzschelia discolor and T pruni-spinosae?

Post by JennyS » Sat Oct 28, 2017 7:48 pm

Hi Chris - great collection of images as always!

In your images the lower cells all appear verrucose despite the colour variation. I'd based my Tranzschelia discolor identification on the +/- smooth lower cell but is this not sufficient to separate them?
Jenny

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