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14-02-2025 23:15

Tomaz Vucko Tomaz Vucko

Hy! Last one for today.How would you identify thi

14-02-2025 21:55

Alan Smith

hello there, this host is a dead stem of Chamerion

14-02-2025 20:15

Tomaz Vucko Tomaz Vucko

Hello! Another species found in the same place as

14-02-2025 19:15

Tomaz Vucko Tomaz Vucko

Hello!I am trying to identify some of the unidenti

14-02-2025 18:31

Francois Guay Francois Guay

Here’s an interesting unidentified ascomycete I

14-02-2025 16:00

Lothar Krieglsteiner Lothar Krieglsteiner

during a workshop on corticiaceous fungi this was

13-02-2025 07:41

Vasileios Kaounas Vasileios Kaounas

first time I encounter it. I didn't expect to see

14-02-2025 12:57

Gernot Friebes

Hello,we are looking for ideas regarding this pyre

14-02-2025 00:22

Jorian Eijkelboom Jorian Eijkelboom

On 6 february 2025 i stumbled upon a leafspot on P

13-02-2025 22:39

Yanick BOULANGER

BonsoirPetits périthèces noirs d'environ 0.5 mm

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Orange disks
Leif Goodwin, 14-10-2023 11:29
This summer I found some cup fungus on soil with acer and black poplar. I struggled to get a spore print so only got a few spores. The asci and paraphyses are shown in Melzers, the spores in Lacto Cotton Blue. The disks are up to 2 cm wide. 

Someone suggested a Purpureodiscus species e.g. P. isabellinus. 

Help appreciated.
  • message #77143
  • message #77143
  • message #77143
Nicolas VAN VOOREN, 22-10-2023 11:19
Nicolas VAN VOOREN
Re : Orange disks
Macroscopically it looks like Purpureodiscus subisabellinus, but you should show some mature ascospores (in water). They measure 18.5-23.5 × 11-13 µm and show bipolar spore granules. The amyloid reaction of asci is only visible on the wall (W type), sometimes difficult to see.
Leif Goodwin, 13-11-2023 18:43
Re : Orange disks
Thank you for taking the time to reply, and apologies for my late response. I have given the specimen to someone who will amplify the ITS region of the DNA and then have it sequenced. When he returns it, I will try and find some mature spores. Hopefully the DNA sequencing will give us an answer, but sadly DNA does not always amplify, possibly because the primers are not ideal for ascos.