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15-01-2019 17:32

Acanthostigma multiseptatum ?
Ethan Crenson

Hello, In the Bronx, New York City last Saturday

18-12-2015 19:03

Literature request
Joop van der Lee

I am looking for the following documentation:  

15-01-2019 00:22

Leptosphaerulina?
Marcel Heyligen Marcel Heyligen

I found this asco by chance on the fruits of Capse

14-01-2019 15:56

Pyreno with subiculum.
Per Marstad Per Marstad

This was growing on a subiculum (see photo).Spores

13-01-2019 13:32

Lachnellula aff subtilissima
Andgelo Mombert

Bonjour à tous, Sur branchette d'Abies alba, le

13-01-2019 21:29

Tiny black bitunicate superficial on Platanus
Ethan Crenson

I find this unknown (to me) asco in the same locat

13-01-2019 19:04

Literatur
Sven Heinz Sven Heinz

Hello together, i am looking for this literature.

12-01-2019 14:05

Ceuthospora hederae?
Viktorie Halasu Viktorie Halasu

Hello forum,is this correctly identified as Ceutho

12-01-2019 13:29

Unknown setiform on dung
Marc Detollenaere Marc Detollenaere

Hello forum, On rabbit dung that I collected 2 we

12-01-2019 15:40

Another anamorph on Hedera
Viktorie Halasu Viktorie Halasu

Hello forum,there is another anamorph from Hedera

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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,
Peter.

  • 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,
Gernot
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,
Peter.