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03-02-2026 20:44

Mycoparasite with irregular conidia
Zetti Mario

When I first saw this white mould on an Agaricus s

18-08-2025 15:07

pyrenomycete on dead parts of foliose liverwort from Norway
Lothar Krieglsteiner Lothar Krieglsteiner

.. 20.7.25, in subarctic habital. The liverwort i

02-02-2026 21:46

Dark disc on Populus
Margot en Geert Vullings

On a barkless poplar branch, we found hairy discs

02-02-2026 14:55

Lichénicole sur Lobaria
Andgelo Mombert Andgelo Mombert

Bonjour,Sur thalle de Lobaria pulmonaria.Conidiome

02-02-2026 14:33

Lichénicole sur Peltigera
Andgelo Mombert Andgelo Mombert

Bonjour,Sur le thalle de Peltigera praetextata, ne

31-01-2026 10:22

Lichenicole hypocreale
Michel Hairaud Michel Hairaud

Bonjour, Cette hypocreale parasite en nombre les

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Scutellinia hirta ? sur souche moussue
Bernard CLESSE Bernard CLESSE

Bonjour à toutes et tous,Pour cette récolte de 2

01-02-2026 19:29

Lambertella sur Olea
Nicolas Suberbielle Nicolas Suberbielle

Bonjour, Marie-Rose D'Angelo (Société Mycologiq

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Calycina ?
éric ROMERO éric ROMERO

Bonjour tous, Récolté dans les Vosges le 22/10/

31-01-2026 09:17

Small hairy discs on Castanea
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Dear Forum,On decorticated wood of Castanea,I foun

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Sclerotinia sclerotiorum?
Gernot Friebes, 28-08-2018 20:42
Hi,

I'm wondering if this is S. sclerotiorum, found at 2.300 m alt. among Cirsium spinosissimum. Sometimes the apothecia grew directly on strongly decayed stems of the Cirsium, but in some cases such a connection was not readily apparent. The ascospores are 2-nucleate, measure about 12–15.5 x 6–7 µm, the excipulum is weakly amyloid. 

Best wishes,
Gernot
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Hans-Otto Baral, 28-08-2018 21:33
Hans-Otto Baral
Re : Sclerotinia sclerotiorum?
The VBs in the paraphyses exclude a Sclerotinia. I suggest a Botryotinia (now Botrytis). Did you study the medulla of the sclerotium for host tissue?

How large are the apos?

But I am sure what it is: Sclerotinia cirsii-spinosissimi. This is actually a Botryotinia according to the sequence.
Gernot Friebes, 28-08-2018 22:00
Re : Sclerotinia sclerotiorum?
Right, I forgot about the VBs... The authors of S. cirsii-spinosissimi write that the medullary excipulum is not blueing in IKI; I did observe a blueish reaction, however (see second plate, photo on the bottom right). Maybe this feature can vary?

Thank you and best wishes,
Gernot
Gernot Friebes, 28-08-2018 22:04
Re : Sclerotinia sclerotiorum?
PS: I did not study the sclerotium. The apothecia were relatively large and fleshy and thus hard to overlook, up to about 8 mm in diameter.
Hans-Otto Baral, 28-08-2018 22:18
Hans-Otto Baral
Re : Sclerotinia sclerotiorum?
I can imagine variation in the blueing of the medulla, but I am not sure.