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26-03-2026 15:31

Hymenoscyphus ombrophiliformis?
Ã…ke Widgren Ã…ke Widgren

Hello,I found this one in October last year, on r

27-03-2026 15:23

Trichopezizella barbata?
Gernot Friebes

Hi,this Trichopezizella deviates from typical T. b

25-03-2026 10:35

Encoelia impudicella?
Hulda Caroline Holte

Hello,I collected this species growing on a dead b

27-03-2026 15:08

Coelomycete on Cirsium
Gernot Friebes

Hi,I'm looking for help with this coelomycete on C

27-03-2026 10:47

Stictis cf. friabilis and literature request
Ã…ge Oterhals

I have tentatively identified this Stictis to S. f

24-03-2026 21:37

Helminthosphaeria
Elisabeth Stöckli

Bonsoir,Sur bois (tronc) très pourri de conifère

26-03-2026 12:50

Pseudombrophila
David Chapados David Chapados

Hi,I'm having a hard time figuring which Pseudombr

26-03-2026 11:17

asco in Ulmus
Vasileios Kaounas Vasileios Kaounas

Found 11-03-26, in leaf of Ulmus sp. Diameter 2-4

25-03-2026 22:23

Orbilia with resin deposits
Marc Detollenaere Marc Detollenaere

Dear Forum,On a debarked stem of Tilia, we found s

24-03-2026 15:44

Leptodontidium cf. trabinellum
Ã…ge Oterhals

I hope someone can confirm the name of this collec

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Thyronectria on unknown hardwood branch
Ethan Crenson, 05-02-2025 04:38
Hi all,

Found by a friend last Saturday in Staten Island NYC, in mixed hardwoods with Quercus, Liquidambar, Prunus, Betula.  I believe this is Thyronectria, but I'm not sure what species. (I was almost sure it was going to be Pseudotrichia mutabilis until I saw the spores).

Emerging from underneath the bark. This is either growing on another effete pyrenomycete, or it makes a black stroma—not sure which.  There is a yellow-green scurf on the individual perithecia with a simple black ostiole at the apex.

Spores:


17.5-26.2 x 6.3-8.9µm
Me 21.7 x 7.9µm
Q 2.1-3.2
Qe 2.8
N=24


Hyaline, occasionally allantoid, rounded ends. They do not appear to bud.
(3)7(8) septate, with multiple longitudinal septa.


I have tried to key it out using Jaklitsch, W. M., & Voglmayr, H. (2014). "Persistent hamathecial threads in the Nectriaceae, Hypocreales: Thyronectria revisited and re-instated" but without much luck.


Any help would be appreciated.


Thank you in advance.


Ethan


 

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Viktorie Halasu, 05-02-2025 22:25
Viktorie Halasu
Re : Thyronectria on unknown hardwood branch
Hello,

it's from the group around T. zanthoxyli, but which one...
- Not T. rhodochlora, too narrow spores.
- T. zanthoxyli should have perithecia clearly immersed in stroma and much more curved spores (my Czech coll. attached), although there are also exceptions and the coll. published in https://doi.org/10.1007/s11557-021-01763-z looks much like yours in this aspect.
- T. lonicerae and T. virens I haven't seen myself. T. lonicerae differs macroscopically, as far as one could rely on this feature, also the spores have more narrow poles like T. berolinensis.


So I would say either T. zanthoxyli with atypically straight spores, or T. virens with atypically long spores.


Viktorie

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Ethan Crenson, 05-02-2025 22:41
Re : Thyronectria on unknown hardwood branch
Thank you Viktorie!  I will take another look at the spores   My impression of the spores (from memory) is that many were curved, though not all. I am also planning to sequence my collection.

Thanks again!