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20-05-2015 11:39

Peter Thompson

Hello Everyone,I have found fruit bodies growing o

19-05-2015 00:35

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Sur feuillus, jusqu'à 18 mm diamètre.J'ai doutes

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Plagiostoma on Epilobium
Peter Thompson, 20-05-2015 11:39
Hello Everyone,

I have found fruit bodies growing on a stem of Epilobium hirsutum, which display characteristics of the genus Plagiostoma. The attached photo shows the densely grouped fruit bodies, with ostioles offset to the edge of the perithecia.

The spores, which are faintly 1-septate, have a very short bristle at each end, as shown in the attached sketch.

I have referred to the Systematic Account of the Genus Plagiostoma, which was published in March 2011 and see that there are no species included on the substrate Epilobium. Using the key instead, my sample does not key out, based on the microscopic and macroscopic characteristics either.

I wonder if during the four years since the systematic account was published, species of Plagiostoma have been found and identified on other hosts.

I do have a lot of fruit bodies, if anyone is interested for sequencing etc.

Thank you,
With Best Wishes,
Peter.
  • message #35961
  • message #35961
Alain GARDIENNET, 20-05-2015 12:12
Alain GARDIENNET
Re : Plagiostoma on Epilobium

Hi Peter,


See Gnomonia riparia.


Alain

Chris Yeates, 20-05-2015 12:48
Chris Yeates
Re : Plagiostoma on Epilobium
Hello Peter
useful description (under Cryptoderis) here:
http://www.librifungorum.org/Image.asp?ItemID=8&ImageFileName=SyllogeFungorum2-230.jpg

regards
Chris
Alain GARDIENNET, 20-05-2015 14:29
Alain GARDIENNET
Re : Plagiostoma on Epilobium

Or in french (Monod) :


 

Alain GARDIENNET, 20-05-2015 14:34
Alain GARDIENNET
Re : Plagiostoma on Epilobium
Peter Thompson, 20-05-2015 16:07
Re : Plagiostoma on Epilobium
Hello Alain and Chris,

Thank you both for the useful references.

Gnomonia riparia does look good. I had not considered the genus Gnomonia, because of the distinctly offset position of the ostiole.

I do notice that both of the descriptions mention 4-spored asci, whereas I noted 8-spored. I will have another look at my sample to see whether there are any 4-spored.

With Best Wishes,
Peter.
Alain GARDIENNET, 20-05-2015 16:26
Alain GARDIENNET
Re : Plagiostoma on Epilobium

Yes Peter, I note 8 ascospores in each ascus too. It looks like 4-spored (see my photo) but is indeed 8-spored.


Monod has worked on the material of Niessl, Graz 1874, as and he has seen a few asci. Perhaps he has not seen enough good material. And perhaps that G. misella on Hypericum is an other fungus. Molecular data would be necessary.


We can call our fungus "Gnomonia riparia" in the meantime.


Alain


 

Peter Thompson, 20-05-2015 16:37
Re : Plagiostoma on Epilobium
Thanks, Alain.

Yes, I thought that I could see a fifth spore in your ascus photo.

I did notice in the descriptions that there were very few asci available.

My sample certainly has 8-spored asci, which are presumably dead, because the spores are spread throughout instead of being grouped at the tip.

I will record it as Gnomonia riparia.

With Best Wishes,
Peter.