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18-02-2019 19:45


Bonjour récolte sur épicéa, spores 62-83 x 3-3

18-02-2019 11:55

Elisabeth Stöckli

Bonjour, Sur mousse (tronc de Picea en décomposi

18-02-2019 15:38

Savic Dragisa

Hi to all,I found today the branch of Ulmus sp. wi

18-02-2019 14:46

Riet van Oosten Riet van Oosten

Hello, Found by a mushroomfriend on Urtica. He ga

17-02-2019 22:45


OK avec cette détermination ?Merci d'avance pour

17-02-2019 23:17

Blasco Rafael Blasco Rafael

Hola, he recogido esta muestra sobre la corteza de

17-02-2019 11:50

Blasco Rafael Blasco Rafael

Hola, alguno de Ustedes dispone del siguiente Arti

16-02-2019 17:02

Per Marstad Per Marstad

I found this on desiduous wood, in Norway.Diameter

01-02-2019 14:37

Lothar Krieglsteiner Lothar Krieglsteiner

.. collected at 22.12.2013, Portugal, Algarve, nat

15-02-2019 20:44

Edvin Johannesen Edvin Johannesen

Hi! These black, semi-immersed/erumpent apothecio

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Tiny black bitunicate superficial on Platanus
Ethan Crenson, 13-01-2019 21:29
I find this unknown (to me) asco in the same location in the Bronx, NYC, during the cold months on Platanus.  This was collected on Platanus × acerifolia on January 6th on a fallen branch.  The ascomata cluster on the bare wood and tend to congregate in the grooves on the surface.  They measure .3 to .5 mm in diameter and can be pyriform when hydrated, collapsing when dry. 

Asci measure 124-161 by 21-27µm.  Bitunicate.  Ascospores are yellow brown, 4-7 septate, some with longitudinal septa. Thick walled.  They tend to be most constricted at the central septation.  At times the cell closest to that septation is enlarged.  Within the asci I have observed ascospores both with and without a gelatinous sheath.  Ascospores measure 32-46 by 9-11.5µm. 

Does anyone know what this could be?  I have consulted Margaret Barr's "Prodromus to Class Loculoascomycetes" without success.  I vaguely considered Trematosphaeria britzelmayriana, which seems to fit microscopically, but the ascomata are submerged in that taxon. 

I have posted this same organism twice on AF before...
11 Feb. 2018:
17 Nov. 2017:

Any help would be appreciated.
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Simon Kennedy, 16-01-2019 11:50
Re : Tiny black bitunicate superficial on Platanus
I am sorry that I cannot help and I am surprised that no-one has come up with an answer.  Do persevere with inquiries.  Surely, someone will come up with a name,

Ethan Crenson, 16-01-2019 15:57
Re : Tiny black bitunicate superficial on Platanus
Hi Simon,

I don't plan to give up.  Though I don't have much experience with the process, I am going to try to culture this collection and sequence it.  I don't have access to a professional lab, so I'll be relying on dumb-luck more than anything else. 

Thanks for the encouragement.

Alain GARDIENNET, 16-01-2019 21:23
Re : Tiny black bitunicate superficial on Platanus

Hi Ethan,

Look more towards Leptosphaeriaceae. I don't know your fungus.


Björn Nordén, 23-01-2019 18:58
Re : Tiny black bitunicate superficial on Platanus
Looks like Phaeosphaeria.
Dartanha Soares, 01-02-2019 18:29
Dartanha Soares
Re : Tiny black bitunicate superficial on Platanus
Hi Ethan, check the names below.

The name L. platanicola F. Petrak is illegit. but you can find the description on
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Ethan Crenson, 02-02-2019 19:48
Re : Tiny black bitunicate superficial on Platanus
Thank you all for the suggestions.  The L. platanicola from Howe is erumpant and the spores are 3-septate, so that is ruled out.  The L. platanicola of Petrak is closer to my collection, but the spore size is considerably smaller (at least in two of the three of my collections).  But maybe it has potential.  I will look also in Phaeosphaeria as well.
Mlcoch Patrik, 03-02-2019 23:34
Mlcoch Patrik
Re : Tiny black bitunicate superficial on Platanus
I think, that it isn´t Leptosphaeria species, but it is Platystomum. (Or somethink with Lophiostomataceae).