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17-07-2025 11:55

Una para ID 833
Castillo Joseba Castillo Joseba

De ayer en bosque de hayas y abetos, en tieraEjemp

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Sphaerulina cornicola versus Septoria cornina
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Hello,I have trouble distinguishing above mention

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Une hélotiale sur Sphagnum palustre
Michel Hairaud Michel Hairaud

Bonjour, Voici une espèce de  (?) Hyaloscyphace

15-07-2025 13:27

literature request
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Hello, does anyone have access to the following ar

16-01-2023 21:31

Troposporella fumosum => Troposporella monilipes
Riet van Oosten Riet van Oosten

Hello, Nearby the find of Calycina claroflava on

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Hypoxylon cf ticinense
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BonjourAutre dossier laissé en suspendJe viens de

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Jackrogersella minutella VS Hypoxylon cohaerens var. microsporum
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BonjourJ'ai un dossier Jackrogersella qui est rest

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Olla aff. millepunctata (croziers +) on Rubus idaeus
Gernot Friebes

Hi,I wanted to share this collection on Rubus idae

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Rutstroemia ulmariae(?) on Saxifraga rotundifolia
Gernot Friebes

Hi,do you think this collection could be R. ulmari

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Nectria
Elisabeth Stöckli

Bonsoir, Trouvé sur un tronc de Salix recouvert

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Byssonectria (?) Pyronemataceae from Eastern US
Ethan Crenson, 23-04-2024 21:49
Hello all,

A friend recently found this orange asco on bare earth in a New York City park. The apothecia are orange, turbanate, sessile growing without an apparent mycelial mat on a muddy tire rut.  The largest is 1.5 mm in diameter. They sometimes have a faint white marginal zone.

The apothecia are unfortunately immature. I am unable to find many ejected spores. The spores in ascus are broadly ellipsoid, smooth and small.  The few I was able to measure out of the asci were approximately 9-10 x 5-6µm.

The few asci present are IKI-.  Paraphyses are enlarged at the tips and contain orange pigments which stain green in IKI.

In the field I thought this might be Ramsbottomia, but the microscopy shows that it is obviously not. My next thought was Byssonectria, but the Pfister paper Synopsis of the North American Species of Byssonectria contains nothing with spores this shape and size. Byssonectria deformis, in Zotto's folder, has broadly ellipsoid spores, but much larger and it also appears to be restricted to Europe, from what I can tell.



Can anyone help with this asco?



Thank you in advance,

Ethan
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Uwe Lindemann, 23-04-2024 22:23
Uwe Lindemann
Re : Byssonectria (?) Pyronemataceae from Eastern US
Hello Ethan,

yes, I would agree that it is a species of the genus Byssonectria. The macroscopic appearance is very typical. As for the ascospores, they look immature to me. Perhaps you should wait a few more days and then examine the ascomata again?

Best, Uwe


Ethan Crenson, 23-04-2024 22:26
Re : Byssonectria (?) Pyronemataceae from Eastern US
Thank you for your comments, Uwe.  Is it possible that over the course of a few days the spores will become more fusiform in shape and grow to the size of typical North American species?  They seem so different.
Uwe Lindemann, 23-04-2024 22:34
Uwe Lindemann
Re : Byssonectria (?) Pyronemataceae from Eastern US
No, I don't think they will become fusiform.

Best, Uwe