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Riet van Oosten
Add-on topic http://www.ascofrance.com/forum/7059
Sclerotinia sclerotiorum?
Gernot Friebes,
28-08-2018 20:42
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
Hans-Otto Baral,
28-08-2018 21:33
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.
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
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
Re : Sclerotinia sclerotiorum?
I can imagine variation in the blueing of the medulla, but I am not sure.