Accès membres

Mot de passe perdu? S'inscrire

31-08-2025 17:32

Michel Hairaud Michel Hairaud

Bonjour, Pas d'identité trouvée pour cette réc

31-08-2025 19:41

Enrique Rubio Enrique Rubio

Hi to someone.I need to download this issue of Sve

31-08-2025 14:34

Thomas Flammer

I have found a Rutstroemia on abt. 2000 m on Alnus

29-08-2025 19:04

Thomas Flammer

Spores 21.2 - 26.2 x 8.3 - 11.3 µm - Q: 2.20 - 2.

30-08-2025 18:29

Joaquin Martin

Hi,I found this undetermined ascomycete on broadle

28-08-2025 17:24

Thomas Flammer

I know, that this is not the real topic of this fo

29-08-2025 05:16

Francois Guay Francois Guay

I think I may have found the teleomorph of Dendros

24-08-2025 21:59

Edmond POINTE Edmond POINTE

Bonsoir amis mycologues,Trouvé sur crottin de che

27-08-2025 12:02

Pavol Palo

Hello dear friendsI would like to ask for sharing

25-08-2025 17:37

François Freléchoux François Freléchoux

Bonjour,Nous avons trouvé samedi dernier à l'ét

« < 1 2 3 4 5 > »
Valsa on Prunus spinosa branches
Enrique Rubio, 07-04-2012 19:31
Enrique RubioHello my friends of the forum:

I'd like to know your opinion about this fungus that forms erumpent stromata on Prunus spinosa branches lying on the ground.
Stromatic disc is witish/grayish and the stromata have a conspicuous ventral black line. Spores are hyaline and very heterometrical. Many asci with 8 ascospores. 

We think this is a Valsa species but we have not seen his Cytospora anamorphic state.

Maybe Valsa ambiens?   
Many thanks again
Enrique
  • message #18101
  • message #18101
  • message #18101
  • message #18101
  • message #18101
  • message #18101
Björn Wergen, 07-04-2012 21:10
Björn Wergen
Re : Valsa on Prunus spinosa branches
Hi Enrique,

I also think it should be V. ambiens. See Spielman 1985.

regards,
björn
Enrique Rubio, 08-04-2012 11:30
Enrique Rubio
Re : Valsa on Prunus spinosa branches
Many thanks, Björn
Enrique
Vera Hayova, 08-04-2012 21:09
Re : Valsa on Prunus spinosa branches
Hello,

It can't be Valsa ambiens since there is the black delimitation line. I would suggest it's Leucostoma cinctum.

To make sure, try to do transversal cross-sections of several ascostromata. You can find remnants of the anamorph (usually different in colour) in the upper part of some of them, right in the middle. If it is so, then it is surely L. cinctum. In fact, it already seems so on your pic 1, on the transverse section that is below on the right. This is a distinguishing character of the species, plus your dimensions fit it well.

Hope this is helpful.

Vera
Enrique Rubio, 09-04-2012 18:40
Enrique Rubio
Re : Valsa on Prunus spinosa branches
Hi Vera

What color has the anamorph?   and what are the conidia?. Have you literature or images about this species?

Many thanks for ypur kindly help
Vera Hayova, 10-04-2012 14:17
Re : Valsa on Prunus spinosa branches
Hi Enrique,

Information on this species is limited and very scattered as on many of Valsaceae.

L. cinctum is known to have both anamorph and teleomorph in one stroma. Sometimes, it is easy to notice, even without a cross section, like on photo 1 where pycnidial ostiole is clearly seen surrounded by ascomatal ostioles. In this case, conidioma remains inside there, although appearing rather unusual (photo 2) but conidia still can be found there; they look like tiny ascospores. At a later stage, when perithecia have mature asci, normally one can see only remnants of the anamorph as a greyish mass.

Vera

PS. Pictures taken also on Prunus spinosa.
  • message #18125
  • message #18125
Enrique Rubio, 10-04-2012 14:47
Enrique Rubio
Re : Valsa on Prunus spinosa branches
Thank you Vera
Do you know what are morphologically the conidia and its measures?
Vera Hayova, 10-04-2012 15:25
Re : Valsa on Prunus spinosa branches
Conidia are similar in shape to ascospores but much smaller - allantoid, hyaline, about 6-7 x 1.5 mkm.
Enrique Rubio, 10-04-2012 18:01
Enrique Rubio
Re : Valsa on Prunus spinosa branches
Dear Vera:
Unfortunately I could not have found anamorphe remains.

Many thanks for you help
Enrique
Vera Hayova, 10-04-2012 18:36
Re : Valsa on Prunus spinosa branches
Hi Enrique,

Anyway I think it's L. cinctum, due to asci/ascospore dimensions. You probably have all mature ascostromata and it's too late to see anamorph.

Best wishes,
Vera
Enrique Rubio, 10-04-2012 18:48
Enrique Rubio
Re : Valsa on Prunus spinosa branches
OK., Vera.
Next week end i'll try to collect more material and I will looked for the anamorphic state on more branches.
Many thanks!
Enrique
Vera Hayova, 10-04-2012 18:55
Re : Valsa on Prunus spinosa branches
OK, good luck. Let me know if you find it. I believe this feature of the species should be everywhere the same.