24-04-2024 21:54
éric ROMERO
Bonjour, J'ai trouvé ce Lasiobolus sur laissées
23-04-2024 15:18
Lothar Krieglsteiner
... but likely a basidiomycete. I hope it is o.k.
23-04-2024 13:17
Edouard Evangelisti
Bonjour à tous, Je viens de récolter ce que je
23-04-2024 21:49
Ethan CrensonHello all, A friend recently found this orange as
22-04-2024 11:52
Zuzana Sochorová (Egertová)
Hello,I made a loan of a collection of Microstoma
11-01-2022 16:36
Jason Karakehian
Hi does anyone have a digital copy of Raitviir A (
22-04-2024 20:38
Miguel Ángel Ribes
Good afternoon.Does anyone know this anamorph?It g
19-04-2024 14:28
B Shelbourne
Cudoniella tenuispora: Distinctive macro and habit
Black pulvinate asco on Prunus
Ethan Crenson,
26-08-2017 15:56
Hans-Otto Baral,
26-08-2017 16:08
Re : Black pulvinate asco on Prunus
Hi Ethan
Remarkable fungus! I am not sure if the asci stand in a hymenium at the surface of these ascomata or if they are in cavities, i.e., perithecia in a stroma. Do you have survey photos of a section that perhaps show such cavities?
The ionomidotic KOh reaction reminds of a Codieritidaceae
Zotto
Remarkable fungus! I am not sure if the asci stand in a hymenium at the surface of these ascomata or if they are in cavities, i.e., perithecia in a stroma. Do you have survey photos of a section that perhaps show such cavities?
The ionomidotic KOh reaction reminds of a Codieritidaceae
Zotto
Ethan Crenson,
26-08-2017 22:10
Re : Black pulvinate asco on Prunus
Zotto,
In the fourth photo I tried to show a cross section of two ascomata. As you can see there is a distinct dark layer at the surface and light brown tissue in the interior. However, I don't detect perethecia in the black layer. I am including a closer version of one of the section photos here.
I can't find Codieritidaceae in Google. If there's a typo, I'm afraid I can't figure it out.
Ethan
In the fourth photo I tried to show a cross section of two ascomata. As you can see there is a distinct dark layer at the surface and light brown tissue in the interior. However, I don't detect perethecia in the black layer. I am including a closer version of one of the section photos here.
I can't find Codieritidaceae in Google. If there's a typo, I'm afraid I can't figure it out.
Ethan
Hans-Otto Baral,
26-08-2017 22:18
Re : Black pulvinate asco on Prunus
Sorry, it is Cordieritidaceae. It is a vast group of encoelioid discomycetes.
I would prefer doing a thin section for transmitted light, and also to show the paraphyses.
It may be important too to look whether the ascus tip gets thick-walled in the dead state (after shortly heating the slide or adding MLZ or KOH).
I would prefer doing a thin section for transmitted light, and also to show the paraphyses.
It may be important too to look whether the ascus tip gets thick-walled in the dead state (after shortly heating the slide or adding MLZ or KOH).
Ethan Crenson,
26-08-2017 22:27
Re : Black pulvinate asco on Prunus
Perhaps these are a little clearer. I am prepareing to do a thin section as you suggested.
Hans-Otto Baral,
27-08-2017 07:20
Re : Black pulvinate asco on Prunus
Yes, it looks like a hymenium covering the whole exterior. I see dark olive dots on the hymenial surface which probably represent exudate on the paraphysis tips, could you supply a photo with oil immersion showing thse tips? I assume in KOH this exudate gets dissolved as well?
What also shows the ionomidotic reaction is the genus Dermea. This should contain crystals in the medulla and angular cells in the ectal excipulum.
What also shows the ionomidotic reaction is the genus Dermea. This should contain crystals in the medulla and angular cells in the ectal excipulum.
Ethan Crenson,
29-08-2017 06:51
Re : Black pulvinate asco on Prunus
Otto,
Yes, the exudate on the paraphysis tips dissolves in KOH. In the photos provided here you can see the paraphyses, both covered in the exudate and naked. I've also tried to find the features of asci in the dead state and the exipulum that you mentioned, but I'm not sure if I succeeded.
Thank you for your help,
Ethan
Yes, the exudate on the paraphysis tips dissolves in KOH. In the photos provided here you can see the paraphyses, both covered in the exudate and naked. I've also tried to find the features of asci in the dead state and the exipulum that you mentioned, but I'm not sure if I succeeded.
Thank you for your help,
Ethan
Hans-Otto Baral,
29-08-2017 07:34
Re : Black pulvinate asco on Prunus
Yes, this looks good enough to make up one's mind. The apical thickening of the asci is clearly visible, also I think I see many crystals in the excipulum. The latter would clearly exclude a Cordieritidaceae and support that this is a Dermea.
When I go with Groves' (1946) key in Mycologia 38: 364, then I arrive at the common Dermea cerasi. Ascus and spore size fits well (dead asci in KOH are certainly smaller than the living ones you have measured). Only the anamorph is missing, but anyway I am sure.
Zotto
When I go with Groves' (1946) key in Mycologia 38: 364, then I arrive at the common Dermea cerasi. Ascus and spore size fits well (dead asci in KOH are certainly smaller than the living ones you have measured). Only the anamorph is missing, but anyway I am sure.
Zotto