25-07-2009 07:15
Alain GARDIENNET
Bonjour, Je ne vois pas ce que peut être ce peti
24-07-2009 19:32
Edouard Evangelisti
Bonjour le forum ! Je sollicite votre aide pré
24-07-2009 16:48
Beñat Jeannerot
Bonjour à tous, Je reviens un peu dans les parag
21-07-2009 00:27
Miguel Ángel Ribes
Hi again This another one is 1-1,5 mm, subsesil
16-07-2009 23:03
Mireille LenneBonsoir, J'hésite pour l'espèce dont fichier
14-07-2009 19:33
Enrique Rubio
Hi to all. Have you some idea about this minute a
13-07-2009 08:10
Hans-Otto Baral
I do not expect a name for this, but perhaps someo
Microthyrium on Bark of Hedrea helix
Peter Thompson,
01-05-2013 13:47
I recently found a Microthyrium species with evenly coloured thyriothecia growing on the bark of ivy (Hedera helix). It is quite clearly not Microthyrium ciliatum var. hederae, usually found on leaves, because the spores are significantly larger.
I have attached an image of the fruit bodies and the microscopy.
I wonder if anyone has an idea as to which species it will be.
Thank you,
Best wishes,
Peter.
Chris Yeates,
01-05-2013 15:40
Re : Microthyrium on Bark of Hedrea helix
Hello Peter
that doesn't look right for a Microthyrium to me . . .
cheers
Chris
that doesn't look right for a Microthyrium to me . . .
cheers
Chris
Peter Thompson,
01-05-2013 16:38
Re : Microthyrium on Bark of Hedrea helix
Hello Chris,
The fruit bodies are flat and can be lifted intact off the surface of the host. They are surely thyriothecia of Microthyrium or a similar genus.
Best wishes,
Peter.
The fruit bodies are flat and can be lifted intact off the surface of the host. They are surely thyriothecia of Microthyrium or a similar genus.
Best wishes,
Peter.
Chris Yeates,
01-05-2013 19:01
Re : Microthyrium on Bark of Hedrea helix
Hello Peter
I wouldn't argue with "similar genus" and it may be that the photo is somewhat deceptive, but is the upper surface really only one cell thick?
Chris
I wouldn't argue with "similar genus" and it may be that the photo is somewhat deceptive, but is the upper surface really only one cell thick?
Chris
Alain GARDIENNET,
01-05-2013 20:48
Re : Microthyrium on Bark of Hedrea helix
Hi,
Yes perhaps another Microthyriaceae, like Phragmothyrium flageoletii (just an idea to check).
It woulb be useful to see a vertical cut, and the structure of peridium.
Alain
Yes perhaps another Microthyriaceae, like Phragmothyrium flageoletii (just an idea to check).
It woulb be useful to see a vertical cut, and the structure of peridium.
Alain
Peter Thompson,
26-05-2013 19:02
Re : Microthyrium on Bark of Hedrea helix
Hello Alain,
Thank you for your suggestion of Phragmothyrium flageoletii and my apologies for taking so long to respond.
I have found a document of Illinois Biological Monographs. Using the key to genera, I arrive at Phragmothyrium as the genus. From the species listed and described, only two are known to grow on Hedera. P. flageoletii is certainly the closest from the sizes of spores and asci, but I also see paraphyses, whereas the Illinois Biological Monographs describe the species as not having paraphyses.
I have attached the cross section, which you requested (with thanks to Peter Wilberforce, who is also interested in this sample). Also attached is the image of the asci.
We wonder what you think?
Thank you,
Best Wishes,
Peter.
Thank you for your suggestion of Phragmothyrium flageoletii and my apologies for taking so long to respond.
I have found a document of Illinois Biological Monographs. Using the key to genera, I arrive at Phragmothyrium as the genus. From the species listed and described, only two are known to grow on Hedera. P. flageoletii is certainly the closest from the sizes of spores and asci, but I also see paraphyses, whereas the Illinois Biological Monographs describe the species as not having paraphyses.
I have attached the cross section, which you requested (with thanks to Peter Wilberforce, who is also interested in this sample). Also attached is the image of the asci.
We wonder what you think?
Thank you,
Best Wishes,
Peter.
PhragmothyriumSpecies-0001.doc