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07-06-2025 15:39

Edvin Johannesen Edvin Johannesen

A friend sent me a few Betula seeds with tiny blac

08-06-2025 14:55

Edvin Johannesen Edvin Johannesen

Ascomata only ca. 1 mm, erumpent on very thin Sali

04-06-2025 15:10

Stefan Jakobsson

Hi forum, On a herbaceous stem, possibly Aegopodi

03-06-2025 20:52

Stefan Blaser

Hello everybody, I didn't get anywhere with this

04-06-2025 14:02

Matthew Rozanoff

Good morning,I was wondering if anyone recognizes

30-05-2025 10:20

Elisabeth Stöckli

Bonjour, Sur branches mortes de Salix en place (m

20-05-2025 22:15

Francois Guay Francois Guay

I found this ascomycete at the base of a dead fern

30-05-2025 17:54

Louis DENY

Hello forum!Touvé près de Belfort, altitude 350m

31-05-2025 00:51

Ethan Crenson

Hello, Last week in New York City this Orbilia wa

30-05-2025 14:40

Josep Torres Josep Torres

Hello.An ascomycete from last May 10th, sprouting

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Anamorph with muriform conidia on Betula seeds
Edvin Johannesen, 07-06-2025 15:39
Edvin JohannesenA friend sent me a few Betula seeds with tiny black fungi on them. It has brown muriform conidia. On the Plant Parasites of Europe website I find no matching species on Betula seeds. Does anyone have a clue?  Thanks!
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  • message #82847
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Edvin Johannesen, 07-06-2025 20:47
Edvin Johannesen
Re : Anamorph with muriform conidia on Betula seeds
Resembling Phragmotrichum platanoidis.
Martin Bemmann, 08-06-2025 09:41
Martin Bemmann
Re : Anamorph with muriform conidia on Betula seeds
Phragmotrichum platanoidis is found on twigs, not on seeds. Though it was found on Betula in Russia (https://www.cabidigitallibrary.org/doi/full/10.5555/19981005353).

Furthermore the conidia are lacking appendages.

Regards

Martin
Edvin Johannesen, 08-06-2025 10:02
Edvin Johannesen
Re : Anamorph with muriform conidia on Betula seeds
Thanks for your reply, Martin.  I suspect that not many people are looking for fungi on seeds, but I may be wrong.  Since P. platanoidis has been found on Alnus catkins, is it unthinkable that it can be found on Betula seeds?

I'm unsure about your comment about appendages.  I see no appendages on the conidia of P. platanoidis in the literature, nor on this collection.

See attched file.
Martin Bemmann, 08-06-2025 10:04
Martin Bemmann
Re : Anamorph with muriform conidia on Betula seeds
Appendages are seen on your second photo.
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Edvin Johannesen, 08-06-2025 10:16
Edvin Johannesen
Re : Anamorph with muriform conidia on Betula seeds
OK, I see what you mean.  I considered this to be remnants of the end cells of adjacent conidia, since these are formed in chains.
Martin Bemmann, 08-06-2025 10:17
Martin Bemmann
Re : Anamorph with muriform conidia on Betula seeds
Yes, you may be right!
Martin Bemmann, 08-06-2025 10:33
Martin Bemmann
Re : Anamorph with muriform conidia on Betula seeds
I just discovered that P.p. was found 2023 in Germany on dead fruits of Acer pseudoplatanus:

Visagie CM et al. (2024). New and Interesting Fungi. 7. Fungal Systematics
and Evolution 13: 441–494. doi: 10.3114/fuse.2024.13.12

see pp. 482-485.
Edvin Johannesen, 08-06-2025 10:56
Edvin Johannesen
Re : Anamorph with muriform conidia on Betula seeds
That's great!  Thanks a lot.
Edvin Johannesen, 08-06-2025 18:28
Edvin Johannesen
Re : Anamorph with muriform conidia on Betula seeds
It has actually been recorded on Betula catkins (seeds?) from Finland:


https://www.gbif.org/occurrence/1122937376
Martin Bemmann, 08-06-2025 19:48
Martin Bemmann
Re : Anamorph with muriform conidia on Betula seeds
Perfect! These catkins are just the "cones" holding the seeds:

https://en.wikipedia.org/wiki/Betula_glandulosa#/media/File:Betula_glandulosa_%C3%96BG_2012-05-28_01.jpg
Edvin Johannesen, 08-06-2025 22:06
Edvin Johannesen
Re : Anamorph with muriform conidia on Betula seeds
Exactly :-)