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10-04-2026 15:51

Botrytis ficariarum & Peronospora ficariae?
William Slosse William Slosse

Hello everyone, On 08/04/26, I found a growth sit

09-04-2026 15:25

Slerotinia verrucispora ???
Jac Gelderblom

On bare soil between mosses Ifound an asco I deter

09-04-2026 13:55

Small-spored "Diplodia" on broom (Cytisus scoparius) - Denmark
Thomas Læssøe

https://svampe.databasen.org/observations/10589176

09-04-2026 10:12

Melanosporalian on attached decayed wood on fallen Carpinus, Denmark - very long-necked
Thomas Læssøe

https://svampe.databasen.org/observations/10587061

08-04-2026 20:33

Gyromitra sp. ?
Vasileios Kaounas Vasileios Kaounas

Found 07-04-26, in Abies cephalonica. Diameter 1,

08-04-2026 10:39

Littérature Korf
FRANCIS FOUCHIER

Bonjour , je recherche en pdf cet article: KORF R

06-04-2026 15:04

Gnomoniaceae
David Chapados David Chapados

Hi! Could someone help me identifying this specim

29-06-2016 15:18

Scopinella
Per Vetlesen

HiIt was found on the bark of a dead branch of Jun

07-01-2018 22:47

Scopinella?
Per Vetlesen

Grown in moist chamber on bark/resin of fallen Pin

06-04-2026 21:36

Literature search
Viktorie Halasu Viktorie Halasu

Hello, could anyone please send me the article wi

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Coryneum (?) acervuli on oak (?) branch
Ethan Crenson, 12-01-2026 22:02
Hello all,

I am hoping someone will have some insight into this interesting asexual fungus I found on hardwood (probably oak) in a New York City park yesterday. It appears to be erumpent, gelatinous acervuli which bristle with conidia on the surface. When cut the solid interior of the acervuli are black (when fresh) and gelatinous. As they age and hollow out they become tan.


The conidia are brown, very thick walled, multi-septate, and shaped like bowling pins. Sometimes they are curved. There are wavy striations in the flanks of the conidiospores. I am reminded of the conidiospores of Helminthosporium velutinum, but of course that does not produce acervuli like this.


I have seen some discussion/images of the genus Coryneum which seems similar. Can anyone point me in the right direction?


Thanks!
Ethan

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Mathias Hass, 13-01-2026 08:01
Mathias Hass
Re : Coryneum (?) acervuli on oak (?) branch
Hi Ethan

I agree with Coryneum (or teleomorph name Pseudovalsa). There are several species on oak. The dimensions of the conidia might be helpful.

Cheers Mathias
Ethan Crenson, 13-01-2026 21:06
Re : Coryneum (?) acervuli on oak (?) branch
Mathias, 

Thanks for the confirmation on genus.  I guess I did forget to include conidia measurements.  

The larger spores (I excluded the "stunted" looking ones) measure:

76.7-101.9 x 15.3-21.1µm

Me: 91.4 x 18.2µm

Q: 4.4-5.4

Qe: 5

N=9

I have counted from 7 to 11 distosepta in the conidia that I have illustrated here.

I found a key in J. Muthumary; B.C. Sutton. (1986). Coryneum quercinum sp.nov. on Quercus alba from India. , 86(3), 0–515. The key treats Coryneum on Quercus only, so I hope that my ID of the substrate is correct.  

I am unable to see the conidiophores (I am assuming I would need a microtome to section the gelatinous material properly).  But I feel I can exclude C. quercinum based on dimensions of the conidia.  Which leaves the next option at C. megaspermum var. megaspermum "Conidia with up to 11 distosepta, 76-100 x 12-15." The conidia in my collection are somewhat wider. Continuing in the key I get to C. neesii, but the length and number of distosepta doesn't match. 

So I'm left with perhaps C. megaspermum var. megaspermum with conidia somewhat too wide. 

Or maybe I have the wrong substrate.

Ethan
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