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24-02-2026 11:01

Anamorph on Tilia
Gernot Friebes

Hi,found on a branch of Tilia, with conidia measur

23-02-2026 11:22

lasiosphaerioid on pine cone with small, slender spores - Denmark
Thomas Læssøe

https://svampe.databasen.org/observations/10584971

24-02-2026 00:21

Pezizale
Benoît Segerer

Hello,I'm new to this forum, I hope I won't be irr

29-11-2024 21:47

Calycina heterospora
Yanick BOULANGER

BonjourJ'avais un deuxième échantillon moins mat

07-02-2023 22:28

Fracchiaea callista? on Carpinus
Ethan Crenson

Hello friends, On Sunday, in the southern part of

19-02-2026 17:49

Ayuda con Tarzetta sp
Salvador Emilio Jose

Hola buenas tardes!! Necesito ayuda para la ident

09-02-2026 22:01

Sp
ruiz Jose

Hola, me paso esta colección en madera de pino, t

19-02-2026 13:50

Hairy disc-"Patinella sanguineoatra" like
Margot en Geert Vullings

We found this collection on deciduous wood on 7-2-

19-02-2026 12:01

Ayuda con esta
Castillo Joseba Castillo Joseba

Me mandan el material de Galicia (España), recole

17-02-2026 09:41

Diaporthe spiculosa?
Maren Kamke Maren Kamke

Good morning, I found a Diaporthe species on Samb

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Bitunicate pyrenomycete with yellow-green colors
Ethan Crenson, 07-11-2021 22:17
Hello all,

I'm trying to identify a bitunicate pyrenomycete.  I found it yesterday on growing on the surface of well-rotted hardwood.  It may have been associated with a Hypoxylon that was also on the substrate.  Fruiting bodies are hard and carbonaceous, spherical, less than 1mm in diameter and covered in a yellow-green powdery substance.

Asci are bitunicate, 110 x 13µm. 

Spores are hyaline, 1-septate with 4 oil droplets and the constriction at the septa that creates a characteristic shape that I associate with Diaporthe-like species (am I right about that?).  The spores also appear to have a sheath of some sort that covers most of the spore.  They measure 34.5-37.9 x 7.9-10.7 (measured without the sheath). 

Does anyone recognize this pyreno?

Thanks in advance,

Ethan
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Jacques Fournier, 08-11-2021 09:55
Jacques Fournier
Re : Bitunicate pyrenomycete with yellow-green colors
Hi Ethan,

this sounds like Pseudotrichia mutabilis (Persoon: Fr.) Wehmeyer. Not sure it has not been combined under a new name.

Good luck,

Jacques
Ethan Crenson, 08-11-2021 14:52
Re : Bitunicate pyrenomycete with yellow-green colors
Jacques,

Thank you! That is definitely my pyreno!  I was looking in the database in the Diaporthaceae, clearly that was wrong.  But I'd never have imagined that the root "trichia" would be involved in any way.

Thanks again!

Ethan
Jacques Fournier, 08-11-2021 15:11
Jacques Fournier
Re : Bitunicate pyrenomycete with yellow-green colors
Ethan,

this highlights the importance of assessing first whether a pyreno is uni-or bitunicate before getting to a family or a genus.

This key character is not always easy to observe and requires careful observations. It is more obvious in immature asci and using stains like chlorazol black is often helpful.

Cheers,

Jacques