Accès membres

Mot de passe perdu? S'inscrire

05-03-2026 10:07

White apothecia on pine cone
Hulda Caroline Holte

Hello, I found and collected this species growing

07-03-2026 13:06

Phaeohelotium parasulphuratus ?
éric ROMERO éric ROMERO

Bonjour tous, Sur cône d'épicea fortement imbu,

23-12-2025 08:27

Hymenoscyphus?
Josep Torres Josep Torres

Hello.Small, yellowish ascomata, with very short a

28-02-2026 11:05

Peziza
Yanick BOULANGER

Bonjour à tousLe 24/02/2026 à Montmacq, devant m

08-03-2026 14:05

Helvella lacunosa
Thierry Blondelle Thierry Blondelle

Bonjour à tous,Sur 3 récoltes supposées de H. l

07-03-2026 22:22

Volutella?
Josep Torres Josep Torres

Hello.Some very tiny conidiomes collected in the D

06-03-2026 17:51

Orbilia?
William Slosse William Slosse

Good evening all,On March 4, 2026, I found the fol

05-03-2026 16:30

Is this Diaporthe rudis?
François Bartholomeeusen

Dear forum members, On the 2nd of February 2026,

06-03-2026 09:41

indian literature
Alain GARDIENNET Alain GARDIENNET

Hi forum, I'm now looking for another reference c

05-03-2026 19:29

Ciboria caucus?
William Slosse William Slosse

Good evening everyone,On March 4, 2026, I found th

« < 1 2 3 4 5 > »
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
  • message #20230
  • message #20230
  • message #20230
  • message #20230
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