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31-10-2024 22:25

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strange pyrenomycete on Rhododendron twigs
Björn Wergen, 30-10-2012 21:07
Björn WergenHello 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
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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
Jacques Fournier, 01-11-2012 14:43
Jacques Fournier
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
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
Björn Wergen
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
Jacques Fournier, 01-11-2012 17:10
Jacques Fournier
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