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24-04-2026 03:16

Trinacrium robustum?
David Chapados David Chapados

Found while looking at something else from wood in

22-04-2026 20:54

Pyrenopeziza on monocot.
Enrique Rubio Enrique Rubio

Hi to everybody.This Pyrenopeziza grew in moist le

22-04-2026 01:06

Neonectria ou thelonectria ?
Richard VALERI Richard VALERI

Bonjour à tous.Je vous présente cette Nectria s.

22-04-2026 20:17

Pseudaegerita spec.
Marian Jagers Marian Jagers

Is anyone familiar with the Hyphomycetes genus Pse

23-04-2026 06:46

Fungus sp
François Freléchoux François Freléchoux

Bonjour, Voici la description d'un minuscule asco

21-04-2026 22:14

Peziza
Margot en Geert Vullings

This cup fungus was found on April 10, 2026, on lo

22-04-2026 19:12

Poilu, violet avec KOH
Louis DENY

Bonjour forum.Trouvé à Belfort, est de la France

21-04-2026 21:00

Hymenoscyphus sp
Sylvie Le Goff

Bonjour à tousJe sollicite votre aide pour cet as

21-04-2026 13:36

Wentiomyces-like on Salix
Gernot Friebes

Hi,I am out of ideas for this one. I collected Sal

21-04-2026 13:19

Lophodermium on Typha
Gernot Friebes

Hi,this Lophodermium on Typha has ascospores measu

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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.