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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
Jacques Fournier,
08-02-2023 15:37
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
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
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
Good luck
Jacques