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03-10-2025 13:44

Riet van Oosten Riet van Oosten

Hello, Found by Laurens van der Linde on Populus

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Peter Welt Peter Welt

Jamoni, P.G. 1998. Un nuovo discomicete coprofilo

11-10-2025 20:27

Marcel Heyligen Marcel Heyligen

Found on a barked branch, 14 mm in diameter, of Ro

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bonjour à tous, Je ne vois pas comment l'on peut

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S. Rebecca

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10-10-2025 00:49

Ethan Crenson

Hello all, This was found last weekend on a hardw

06-10-2025 15:57

David Chapados David Chapados

Hi, Could anyone help me with this Lophiostoma? 

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Francois Guay Francois Guay

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Fracchiaea callista? on Carpinus
Ethan Crenson, 07-02-2023 22:28
Hello friends,

On Sunday, in the southern part of New York City, on a dead branch of Carpinus, a friend of mine found what I think might be Fracchiaea callista. In small patches, there are crowded clusters of collabent black fruiting bodies seated in a coarse brown subiculum. 

The asci are clavate and measure 76-90 x 13-16µm.  They contain about 32 spores --  I think!? It's very difficult to count them inside the ascus. I'd appreciate some opinions on the number of spores per ascus. (It's like guessing the number of jelly beans in a jar).

The spores are hyaline, allantoid and measure :

7.7-12.5 x 1.6-2.4µm

Me 9.3 x 2.2µm

Q=3.5-6.2

MeQ=4.3

N=23

Am I correct? Thanks for your help. 

Ethan
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Jacques Fournier, 08-02-2023 15:37
Jacques Fournier
Re : Fracchiaea callista? on Carpinus
Hi Ethan,
this fungus is unknown to me, likely American, but I think you are close to the solution.
I went through 2010 Mugambi & Huhndorf's paper (Mycologia 102: 185-210) dealing with the phylogeny of Coronophorales and I learnt that F. callista has been moved to Neofracchieae callista, characterised by a brown subiculum, as on your photos.
I should display a quellkorper, visible in section or with some luck in a squash mount, which places it outside Nitschkiaceae in a distant family. Awful name, I don't even try to memorise it.
I could not find more information on this taxon, maybe Andy can help.

Cheers,
Jacques
Ethan Crenson, 08-02-2023 15:40
Re : Fracchiaea callista? on Carpinus
Greetings and thank you Jacques!  I must admit that, until I started researching this pyreno, I was completely unfamiliar with quellkorper or how to make one visible in a mount.  I will try. I did write to Dr. Miller directly, perhaps I will hear.

Ethan
Jacques Fournier, 08-02-2023 15:45
Jacques Fournier
Re : Fracchiaea callista? on Carpinus
it's a fairly big, gelatinous refractive obconical structure that does not stain in usual stains, sure you will spot it, if not on first attempt.
Good luck
Jacques