Jelly like fungus on conifer

Please try to include photos to show all parts of the fungus, eg top, stem, and gills.
Note any smells, and associated trees or plants (eg oak, birch). A spore print can be very useful.
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Deborah
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Jelly like fungus on conifer

Post by Deborah » Wed Oct 09, 2019 2:02 pm

Hello. This fungus appears regularly (at least once a year) on a conifer (not sure which - perhaps Chamaecyparis) in a London garden. It seems to be triggered by heavy rain and the branch that it forms on appears swollen. After fruiting the fungus dries and falls off and apparently the branch looks ‘scaly’. The tree seems to be dying very slowly - it’s been a mature specimen for about 30 years, and still hanging on. Any help with identification would be much appreciated. Sorry for the poor quality photo.
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Chris Yeates
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Re: Jelly like fungus on conifer

Post by Chris Yeates » Wed Oct 09, 2019 5:30 pm

Hello Deborah
it's a bit difficult to see exactly what is going on but from what I can see and your very useful observation "It seems to be triggered by heavy rain" I think this could well be Tremella foliacea. See https://en.wikipedia.org/wiki/Tremella_foliacea for further information. If it is this then it will be growing on another fungus of the genus Stereum (S. sanguinolentum is the usual one on conifers) - shots of the branches when the Tremella has apparently disappeared, in dry conditions, might be useful.

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

Deborah
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Re: Jelly like fungus on conifer

Post by Deborah » Wed Oct 09, 2019 5:52 pm

Thanks for your help. Hopefully will post another photo of branch tomorrow.

eltio
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Re: Jelly like fungus on conifer

Post by eltio » Wed Oct 09, 2019 6:49 pm

Would Gymnosporangium be a possibility?

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Chris Yeates
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Re: Jelly like fungus on conifer

Post by Chris Yeates » Wed Oct 09, 2019 7:18 pm

eltio wrote:
Wed Oct 09, 2019 6:49 pm
Would Gymnosporangium be a possibility?
That is a very good suggestion, more than just a possibility. It would certainly make sense of the fungus's appearance in several spots like this, and its being on living branches. Deborah's further photographs will hopefully sort it.
"You must know it's right, the spore is on the wind tonight"
Steely Dan - "Rose Darling"

Deborah
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Re: Jelly like fungus on conifer

Post by Deborah » Thu Oct 10, 2019 8:42 am

Hi. Here’s a couple of photos of a branch after the fruited fungus has dropped off, showing the ‘scaliness’/ raised bark and the swelling of the wood. Hope this gives further information. Thanks.
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Chris Yeates
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Re: Jelly like fungus on conifer

Post by Chris Yeates » Thu Oct 10, 2019 8:56 pm

Yes I'm sure this is a Gymnosporangium and your conifer should therefore be savin, Juniperus sabina (see https://www.conifers.org/cu/Juniperus_sabina.php).

There are two Gymnosporangium species on J. sabina in the UK: G. confusum and G. sabinae. I would expect the latter one which is increasingly spreading on the alternate host, pear. Check out any pear trees in your area, Deborah, and they will quite possibly have rather colourful patches on the leaves as here:
Gymnosporangium sabinae 0a.jpg
Best wishes
Chris
"You must know it's right, the spore is on the wind tonight"
Steely Dan - "Rose Darling"

Deborah
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Re: Jelly like fungus on conifer

Post by Deborah » Fri Oct 11, 2019 7:14 am

Many thanks. And, yes, until relatively recently there was a pear tree (now dead), within 25 yards of the conifer which did have the bright markings on the leaves. Fascinating stuff.

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