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11-08-2018 19:10

Sven Heinz Sven Heinz

Hello together, does anyone have any idea what th

08-08-2018 19:44

Andgelo Mombert

Bonsoir à tous,Apothécies de 0,5-1 mm de diamèt

17-08-2018 21:50

Greiff Georges

Hello, Today, on two Fraxineus trees about 100m a

15-08-2018 21:56

Andgelo Mombert

Bonsoir à tous,Sur pétioles et nervures de feuil

16-08-2018 16:08

Blasco Rafael Blasco Rafael

Hola, he recogido esta muestra sobre tronco de Abi

15-08-2018 15:45

Gernot Friebes

Hi,we collected this Scutellinia a few days ago on

15-08-2018 10:24

Gernot Friebes

Hi,found on the bark of an old Picea tree at appro

13-08-2018 09:43

Pintos Angel Pintos Angel

hello, anybody has?Barr ME, Cannon PF (1994) Calos

08-08-2018 12:43

Castillo Joseba Castillo Joseba

De ayer en bosque de Fagus, entre el musgo sobre l

12-08-2018 10:01

Tapio Kekki

These were growing on gravel of a creek. Place is

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Niesslia-like Perithecia on Well Rotted Alnus Trunk
Peter Thompson, 13-05-2018 12:43
Hello Everyone,

I have found some tiny, spherical perithecia with short hairs growing on decorticated and well decayed wood from a trunk of Alnus glutinosa.

The hairs are thick walled, dark brown, with bulbous bases and rounded tips. They strongly resemble the rigid hairs of species of Niesslia, typically measuring 82.5 - 92.5 x 5.25 um. 

The spores are 8- 11-septate, filled with tiny drops in all cells and typically measuring 56 - 65 x 8 - 8.5 um. Hyaline and tapering to rounded ends. there are 8 spores per ascus. The ascus tips show no reaction to lugol.

I have attached a photo of the fruit bodies and a micro photo of the hairs, asci and spores.

I wonder if anyone has an idea as to what they might be?

Thank You,
With Best Wishes,

  • message #53408
  • message #53408
Gernot Friebes, 13-05-2018 12:51
Re : Niesslia-like Perithecia on Well Rotted Alnus Trunk
Hi, Peter,

the ascomata and ascospores remind me of Acanthostigma – it might be worth looking into that direction.

Best wishes,
Peter Thompson, 13-05-2018 18:36
Re : Niesslia-like Perithecia on Well Rotted Alnus Trunk
Hello Gernot,

Thank you for your reply.

Acanthostigma is an unfamiliar genus for me, so I have had a look into the options for host type and macro / micro characteristics and I now believe that my sample is A. minutum. 

Thank you for your help.

With Best Wishes,