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23-03-2025 12:01

Anamorphe sur Stereum
Thierry Blondelle Thierry Blondelle

Bonjour à tous,Ce sont de petits coussinets blanc

24-03-2025 14:58

Disco on Vaccinium
Karl Soler Kinnerbäck

Hi,Dark, erumpent disco on Vaccinium myrtillus, ce

24-03-2025 16:20

Unknown Elaphomyces
Henri Koskinen

I found this very small Elaphomyces on a wet almos

23-03-2025 19:56

Plagiosphaera sp ? Sur Iris
Bruno Coué Bruno Coué

Récolte du 06/03/2025, dans la forêt de la Combe

23-03-2025 20:27

NITSCHKIA PARASITANS
Thomas Flammer

I have no idea where to startsubstrate: deciduous

19-03-2025 17:47

Helvella acetabulum spores aberrantes ?
Philippe Larue Philippe Larue

Bonjour à tous, chaque année à l'approche du p

23-03-2025 10:09

Ascomycete.org newsletter addenda Mars-March 2025
Michel Hairaud Michel Hairaud

Bonjour, Hi to everyone, The English text is avail

23-03-2025 01:00

Pyreno on Pinus
Juuso Äikäs

These little black pyrenos were growing on bark of

20-03-2025 22:35

Hyphodisscus
Yanick BOULANGER

BonsoirJ'ai récupéré cet ascomycète d'un amiJe

19-03-2025 09:29

Is this Pseudomicrodochium bryophilum ?
Michel Hairaud Michel Hairaud

Bonjour, Récolté sur hépatiques colonisant un

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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!