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Small whitish discs with small stalks on dead Quercus twig
William de Jong,
16-10-2021 17:26
A few days ago I found these small whitish discs with small stalks on a dead Quercus twig.
Spores are 1-septate: 9,0-11,0 x 2,5-3,2 µm.
See the pictures for some other details.
I looked around a bit, but I cannot find a right genus yet.
Can anyone point me in the right direction?
Thanks in advance.
Best regards, William
Zuzana Sochorová (Egertová),
16-10-2021 17:41
Re : Small whitish discs with small stalks on dead herbal stem
Hi William,
try Calycina. Calycina herbarum is frequent on Urtica, but spores in your collection are somewhat smaller for this species than they should be. What about oil content of the ascospores? And reaction of asci in IKI?
Zuzana
try Calycina. Calycina herbarum is frequent on Urtica, but spores in your collection are somewhat smaller for this species than they should be. What about oil content of the ascospores? And reaction of asci in IKI?
Zuzana
William de Jong,
16-10-2021 18:23
Re : Small whitish discs with small stalks on dead herbal stem
Hi Zuzana,
Thank you very much for your reply!
I looked at Calycina, but from what I saw those have spores with quite some oil content, which these spores have not, at least as it seems.
For the reaction with Melzers reagens, see the following pictures. Asci turn up yellow with a small blue apical tip and are inoperculate, so Heliotales is probably right?
Thank you very much for your reply!
I looked at Calycina, but from what I saw those have spores with quite some oil content, which these spores have not, at least as it seems.
For the reaction with Melzers reagens, see the following pictures. Asci turn up yellow with a small blue apical tip and are inoperculate, so Heliotales is probably right?
Hans-Otto Baral,
16-10-2021 20:44
Re : Small whitish discs with small stalks on dead herbal stem
What about the substrate being a Carpinus twig? Then the species would be Calycina italica. Common and abundant on Quercus and Carpinus twigs, at least in certain years (usually corticated, but also on wood as here). The spores fit perfectly. Distinctly refractive VBs are absent from the paraphyses in this species.
William de Jong,
16-10-2021 21:01
Re : Small whitish discs with small stalks on dead herbaceous stem
Thank you very much for your reply, Zotto!
You're completely right. Now that I look at it again, it's clearly a wooden twig, and it was in a small forest of Quercus trees. So it is indeed a Quercus twig, it was lying on the ground between Urtica plants. I apparently messed it up with another finding of whitish discs on Urtica material.
My apologies..
So, Calycina italica, a species not yet known from The Netherlands.
Can I do some follow up research to make it a 100% sure?
Or are you already as sure as you can be?
You're completely right. Now that I look at it again, it's clearly a wooden twig, and it was in a small forest of Quercus trees. So it is indeed a Quercus twig, it was lying on the ground between Urtica plants. I apparently messed it up with another finding of whitish discs on Urtica material.
My apologies..
So, Calycina italica, a species not yet known from The Netherlands.
Can I do some follow up research to make it a 100% sure?
Or are you already as sure as you can be?
William de Jong,
16-10-2021 21:33
Re : Small whitish discs with small stalks on dead herbaceous stem
Another measurement of the ascospores: 8,8-10,5 x 2,4-3,0 µm
Hans-Otto Baral,
16-10-2021 21:38
Re : Small whitish discs with small stalks on dead herbaceous stem
There is no doubt, it looks perfect. Asci should have croziers, this you could try to verify.
Did you look at a cross-break of the wood? Quercus must have large pores, carpinus not.
William de Jong,
17-10-2021 15:00
Re : Small whitish discs with small stalks on dead herbaceous stem
Hi Zotto,
I've checked for croziers, they are present!
I'll have a look at the wood, but I don't want to mess up the material, because it's a new species for the Netherlands and someone else will probably have a look at it.
I'll give it a try and I can also visit the place of my finding to see if there are also Carpinus trees.
Thanks again for identificating this Calycina!
Best regards, William
I've checked for croziers, they are present!
I'll have a look at the wood, but I don't want to mess up the material, because it's a new species for the Netherlands and someone else will probably have a look at it.
I'll give it a try and I can also visit the place of my finding to see if there are also Carpinus trees.
Thanks again for identificating this Calycina!
Best regards, William
William de Jong,
17-10-2021 18:47
Re : Small whitish discs with small stalks on dead herbaceous stem
However, the species is already known in The Netherlands under the name Phaeohelotium italicum
Hans-Otto Baral,
17-10-2021 20:21
Re : Small whitish discs with small stalks on dead Quercus twig
Yes, this is an odd taxonomic opinion by Dennis 1971, overruled by modern concepts also supported by DNA.