17-01-2026 19:35
Arnold BüschlenHallo, ich suche zu Cosmospora aurantiicola Lite
08-12-2025 17:37
Lothar Krieglsteiner
20.6.25, on branch of Abies infected and thickened
16-01-2026 00:45
Ethan CrensonHi all, On decorticated hardwood from a New York
10-01-2026 20:00
Tom SchrierHi all,We found picnidia on Protoparmeliopsis mur
13-01-2026 07:28
Danny Newman
Chlorociboria glauca on indet. decorticate logThe
15-01-2026 15:55
Lothar Krieglsteiner
this one is especially interesting for me because
13-01-2026 08:43
Danny Newman
Tricladium varicosporioides on indet. decorticate
Anamorph with muriform conidia on Betula seeds
Edvin Johannesen,
07-06-2025 15:39
A 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!
Edvin Johannesen,
07-06-2025 20:47
Re : Anamorph with muriform conidia on Betula seeds
Resembling Phragmotrichum platanoidis.
Martin Bemmann,
08-06-2025 09:41
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
Shabunin-1997-Phragmotrichum-platanoidis-0001.pdf
Edvin Johannesen,
08-06-2025 10:02
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.
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
Re : Anamorph with muriform conidia on Betula seeds
Appendages are seen on your second photo.
Edvin Johannesen,
08-06-2025 10:16
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
Re : Anamorph with muriform conidia on Betula seeds
Yes, you may be right!
Martin Bemmann,
08-06-2025 10:33
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
and Evolution 13: 441–494. doi: 10.3114/fuse.2024.13.12
see pp. 482-485.
Edvin Johannesen,
08-06-2025 10:56
Re : Anamorph with muriform conidia on Betula seeds
That's great! Thanks a lot.
Edvin Johannesen,
08-06-2025 18:28
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
https://www.gbif.org/occurrence/1122937376
Martin Bemmann,
08-06-2025 19:48
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
Re : Anamorph with muriform conidia on Betula seeds
Exactly :-)