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strange pyrenomycete on Rhododendron twigs
Björn Wergen,
30-10-2012 21:07
Hello everybody,do not worry about the Lasionectria, I will make some sections tomorrow because I did not have the time for it today.
I had to look for something else growing on attached Rhododendron twigs. It has very small perithecia about 0,2-0,4 mm, which remind me on Cryptosporella species. It seems to be characteristic with its allantoid, diatrype-like but hyaline spores, lying in biseriate asci. First I thought the perithecia are immature because I had seen only very prominent paraphyses as you can see on the photos. But than I saw small asci between them, with even smaller spores inside.
I did not see any apical structures of the asci and the spores seem to be non-septate. There is no reaction with Barals/Lugol.
Any idea?
regards,
björn
Adrian Carter,
31-10-2012 10:45
Re : strange pyrenomycete on Rhododendron twigs
Hello Bjorn:
You're fungus looks like it might be in the Calosphaeriales, possibly Jattaea microtheca (Cooke & Ellis) Berl. It usually occurs on decorticated wood of various hardwoods.
A good place to start is Barr, M.E., 1985. Notes on the Calosphaeriales, Mycologia 77:549-565.
Good luck.
Adrian Carter
You're fungus looks like it might be in the Calosphaeriales, possibly Jattaea microtheca (Cooke & Ellis) Berl. It usually occurs on decorticated wood of various hardwoods.
A good place to start is Barr, M.E., 1985. Notes on the Calosphaeriales, Mycologia 77:549-565.
Good luck.
Adrian Carter
Jacques Fournier,
01-11-2012 14:43
Re : strange pyrenomycete on Rhododendron twigs
good guess Adrian, I think you are right.
There is a recent and excellent account on Jattaea in Fungal Diversity 49: 167-198 (2011) by Martina Réblova.
Bjorn, you should check whether perithecia have a long neck or are just papillate. If there is no long neck it should be J. microtheca.
Cheers,
Jacques
There is a recent and excellent account on Jattaea in Fungal Diversity 49: 167-198 (2011) by Martina Réblova.
Bjorn, you should check whether perithecia have a long neck or are just papillate. If there is no long neck it should be J. microtheca.
Cheers,
Jacques
Adrian Carter,
01-11-2012 16:01
Re : strange pyrenomycete on Rhododendron twigs
Thank you, Jacques. I didn't know about the Reblova reference.
Björn Wergen,
01-11-2012 16:32
Re : strange pyrenomycete on Rhododendron twigs
Ha I love you Adrian, thats fantastic. Well there was no neck, there was not even a papilla, the perithecia grew directly under the bark, but they did not break through it.
I have to work now :D
And of course many thanks for the information, Jacques :)
regards,
björn
I have to work now :D
And of course many thanks for the information, Jacques :)
regards,
björn
Jacques Fournier,
01-11-2012 17:10
Re : strange pyrenomycete on Rhododendron twigs
Hi Adrian,
you email address does not seem to be valid. Can you fix it or give me another one?
Jacques
you email address does not seem to be valid. Can you fix it or give me another one?
Jacques