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11-06-2025 16:26

Literature request
Jason Karakehian Jason Karakehian

Hi everyone, I am looking for the following protol

17-06-2025 12:10

Scutellinia para ID 1303
Castillo Joseba Castillo Joseba

Del pasado dia 4  en bosque de hayas, en tierraA

17-06-2025 14:23

¿Hyaloscypha?
Josep Torres Josep Torres

Hello.A probable Hyaloscypha from last June 1st, s

12-03-2025 17:54

Scutellinia hyperborea?
Karl Soler Kinnerbäck

Hi all!Do you agree with Scutellinia hyperborea? P

17-06-2025 12:02

Scutellinia para ID 2259
Castillo Joseba Castillo Joseba

Del pasado sabado, en bosque de hayas y avellanos,

13-06-2025 09:41

Aquatic ascomycete.
Josep Torres Josep Torres

Hello.A cerebriform ascomycete sprouting scattered

13-06-2025 19:57

Helvella
Castillo Joseba Castillo Joseba

De ayer en bosque de hayas y avellanosEjemplar uni

06-06-2025 12:12

S. capillipes
Hans-Otto Baral Hans-Otto Baral

Dear all I want to ask you if you have any recent

01-06-2025 09:37

Octospora
Charles Aron Charles Aron

Hi All, I found this Octospora growing with liver

15-06-2025 21:39

Leptosphaeria cf.conoidea
éric ROMERO éric ROMERO

Bonjour à tous, Espèce récoltée sur une tige

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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