orbilia... - Forum ASCOFrance

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orbilia...

Ingrid van Vlaanderen, 10-09-2016 13:27

I have found this orbilia on a dead tree Beach. I do not have any key to determinate this kind.

the spores 7,5-12 x 2,5-4,5 um

Can anybody help me with this one?

Hans-Otto Baral, 10-09-2016 14:03

Re : orbilia...

Did you measure the width of the asci? The true spores are perhaps 3 x 1 µm large I guess.
Free spores are often sparse in Orbilia. Perhaps you will find a few or you see their shape inside the asci.
Zotto

Ingrid van Vlaanderen, 10-09-2016 14:15

Re : orbilia...

Thanks,I throught you should never maesure the sporee in th ascus... I Will make a new sample and try to measure them. I did not find a lot of spores, but at least 12 I have measured..

Hans-Otto Baral, 10-09-2016 14:35

Re : orbilia...

These spores do not belong to the Orbilia. Do they have some colour?
In Orbilia you may measure spores inside the asci, their size will be quite the same as outside. It is a fairy tale that free spores are more mature than those inside asci. The reverse may be true because you can frequently find overmature and germinating spores inside dead asci.

Ingrid van Vlaanderen, 10-09-2016 15:23

Re : orbilia...

Thank You for explaining.

I have found the smal ones. Not in the asci, i could not see the shape of them.

Could it be Orbilia delicatula?

There are two drops in the end and they are a bite moonlike shaped.

There were slimemolds in between them. maybe that explains the other spores.

I hope this helps.

Ingrid van Vlaanderen, 10-09-2016 15:33

Re : orbilia...

Some more spores

Hans-Otto Baral, 10-09-2016 16:00

Re : orbilia...

Yes, great! And also the small warts on the spores are visible. There is actually a drop only at one end, except for minute ones.

Yes, O. delicatula, but we returned now to the older name O. xanthostigma.

Is this collection from Netherlands, and from which region?

Ingrid van Vlaanderen, 11-09-2016 19:03

Re : orbilia...

I have found them in De Brand Udenhout The south of the Netherlands.
I would love to learn more About Orbilia's . Is there a book where I can learn more about this species.
I also read you mentioned there is a dvd? Do you know about is and where I could buy this?
Thank you for helping me out.

Hans-Otto Baral, 11-09-2016 20:52

Re : orbilia...

Beware of this genus! It is a big mess, and when our publication will come out you will get struck of it.
You can visit my homepage invivoveritas.de, and there look for the many folders within Orbilia, totally almost 500 species.
https://drive.google.com/drive/folders/0B5SeyOEkxxZhT2xTSU1PdUk2N1U

good luck!
Zotto

Ingrid van Vlaanderen, 12-09-2016 20:40

Re : orbilia...

Thank you for sharing your folders with me. I did not know there were so many orbilia's. Ik think there are about 23 found in The Netherlands. This was my second species. So a lot more to go.

Ingrid van Vlaanderen, 12-09-2016 20:40

Re : orbilia...

Thank you for sharing your folders with me. I did not know there were so many orbilia's. Ik think there are about 23 found in The Netherlands. This was my second species. So a lot more to go.

Eduard Osieck, 13-09-2016 11:28

Re : orbilia...

Hi to all,

See the map of the distribution of the species in the Netherlands at:
https://www.verspreidingsatlas.nl/0657030

With the slide on the left the periods can be varied.

Eduard

Hans-Otto Baral, 13-09-2016 13:08

Re : orbilia...

Yes, this is the most often collected species of Orbilia, at least in the herbaria it appears frequently. The problem with this species is that white and yellow collections belong to different species, with a very different rDNA (over 15% distance), although the microscopy is the very same. So we use leucostigma and xanthostigma for them. This is only valid within Europe. Pale yellow collections belong also to xanthostigma, but data on apothecial colour were often not mentioned and in the herbarium the difference gets finally lost.

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