25-11-2025 14:24
Thomas Læssøehttps://svampe.databasen.org/observations/10490522
25-11-2025 11:03
Mick PeerdemanHi all,One of my earliest microscopy attempts, so
24-11-2025 15:23
Arnold BüschlenHallo, auf einer offenen Kiesfläche am Rande ein
23-11-2025 11:16
Bohan JiaHi, I found small discs growing on dead stem of
21-11-2025 10:56
Christopher Engelhardt
Very small (~0,5 mm) white ascos, found yesterday
Dothideomycete on Acer sp
Björn Wergen,
24-09-2012 13:05
Hello,I have found this small pyrenomycete on dead attached Acer sp twigs with very small 0,08-0,14mm broad perithecia singly embedded into the surface of the bark. I had never seen this one, microscopically it reminds me on Cryptosporella species but these spores have a central septation and are over 70µm long.
Is this really bitunicate? I think it is unitunicate and has relations to Diaporthales. But perhaps someone has another idea for it.
regards,
björn
Alain GARDIENNET,
24-09-2012 21:36
Re : Dothideomycete on Acer sp
Hi Björn,
Did you use red congo ? It's very useful with Diaporthales to see apical apparatus.
Alain
Jaklitsch Walter,
25-09-2012 20:50
Re : Dothideomycete on Acer sp
this is possibly an undescribed species of Cresporhaphis (currently in Trichosphaeriaceae). C. macrospora has similarly large ascospores, but they have 1-3 septa and the fungus occurs on Quercus. Sure about Acer?
Cheers,
Walter
Cheers,
Walter
Björn Wergen,
25-09-2012 22:57
Re : Dothideomycete on Acer sp
Hello Walter, hi Alain,
I am sure with Acer. I just do not know if it is definitely A. maximoviczianum, but it is for sure Acer.
Thanks for your opinion, Alain. I will try Congo tomorrow. Today I had Coronophora gregaria (this on has been shown on this forum 2 years ago) and Splanchospora ampullacea.
regards,
björn
I am sure with Acer. I just do not know if it is definitely A. maximoviczianum, but it is for sure Acer.
Thanks for your opinion, Alain. I will try Congo tomorrow. Today I had Coronophora gregaria (this on has been shown on this forum 2 years ago) and Splanchospora ampullacea.
regards,
björn
Adrian Carter,
26-09-2012 12:22
Re : Dothideomycete on Acer sp
Hello All:
I wonder if this could be Leiosphaerella falcata Barr (Bigelow & Barr, 1968. Contribution to the Fungus Flora of Northeastern North America IV. Rhodora 68:175-191). She cited collections on Acer spicatum and A. pensylvanicum. She also mentioned an amyloid reaction in the ascus apex and suggested that it might be included in the Amphisphaeriaceae.
I have found if once in PEI on Acer spicatum. Your collection may be one of the first reports from Europe.
Hope this helps.
Adrian Carter
I wonder if this could be Leiosphaerella falcata Barr (Bigelow & Barr, 1968. Contribution to the Fungus Flora of Northeastern North America IV. Rhodora 68:175-191). She cited collections on Acer spicatum and A. pensylvanicum. She also mentioned an amyloid reaction in the ascus apex and suggested that it might be included in the Amphisphaeriaceae.
I have found if once in PEI on Acer spicatum. Your collection may be one of the first reports from Europe.
Hope this helps.
Adrian Carter
Björn Wergen,
26-09-2012 13:50
Re : Dothideomycete on Acer sp
Hi Adrian,
I will check amyloid reaction today. I will make some more photos of it too.
regards,
björn
I will check amyloid reaction today. I will make some more photos of it too.
regards,
björn
Björn Wergen,
26-09-2012 21:07
Re : Dothideomycete on Acer sp
See what happened with apical apparatus in iodine ;)
regards,
björn
regards,
björn
Adrian Carter,
26-09-2012 22:16
Re : Dothideomycete on Acer sp
Hello Bjorn:
It looks very much like my collection. I would quite interested in your collection data since I've been looking and not found it again.
When and where did you collect it?
Were the twigs still attached to the tree? Acer spicatum is a shrubby maple here in PEI. Is Acer sp you looked at a shrubby maple as well?
Were the areas always bleached where the ascomata were found?
I'm sorry I don't have the Bigelow & Barr article online but I hope you find it. It gives a very good description.
Best Adrian
It looks very much like my collection. I would quite interested in your collection data since I've been looking and not found it again.
When and where did you collect it?
Were the twigs still attached to the tree? Acer spicatum is a shrubby maple here in PEI. Is Acer sp you looked at a shrubby maple as well?
Were the areas always bleached where the ascomata were found?
I'm sorry I don't have the Bigelow & Barr article online but I hope you find it. It gives a very good description.
Best Adrian
Gernot Friebes,
26-09-2012 22:26
Re : Dothideomycete on Acer sp
The article is available here: http://www.botanicus.org/item/31753003413900
Björn Wergen,
26-09-2012 22:57
Re : Dothideomycete on Acer sp
@Walter: I have sent you an email.
@Adrian: many many thanks for the help here. I will answer the questions tomorrow.
@Gernot: thanks for the article, I have to read now ;)
regards,
björn
@Adrian: many many thanks for the help here. I will answer the questions tomorrow.
@Gernot: thanks for the article, I have to read now ;)
regards,
björn
Jaklitsch Walter,
27-09-2012 06:54
Re : Dothideomycete on Acer sp
Congratulations to Björn for finding this remarkable fungus on the exotic maple and to Adrian for its identification!
Walter
Walter