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Pleosporale on indeterminate dicot. stems
Enrique Rubio, 16-05-2012 17:02
Enrique RubioHi again

What do you think about these small (up to 0.5 mm), gregarious, blackish, inmersed (suepidermial), glabrous, sessile and ostiolate (not compressed) pseudothecia that grew on indeterminate dicot. stems at 1600 m of altitude?.
The yellowish ascospores are persistently 5-septate, 6-celled, and the third cell are apically sligthly enlarged. 


Many thanks in advance for your kindly help
Enrique
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Huzefa Raja, 16-05-2012 17:06
Re : Pleosporale on indeterminate dicot. stems
Nice pictures. Seems to me it is a species of the genus Ophiobolus.
Enrique Rubio, 16-05-2012 17:13
Enrique Rubio
Re : Pleosporale on indeterminate dicot. stems
But, what species?
Thanks Huzefa
Huzefa Raja, 16-05-2012 17:18
Re : Pleosporale on indeterminate dicot. stems
Hi Enrique
I am not sure-sorry.  It is a large genus and the literature is quite wide spread.

Best

Huzefa
Huzefa Raja, 16-05-2012 17:25
Re : Pleosporale on indeterminate dicot. stems
Attached is a key that might help shed some light on the species epithet.
Enrique Rubio, 16-05-2012 17:37
Enrique Rubio
Re : Pleosporale on indeterminate dicot. stems
Already I had read this paper, but without success...
Thanks!
Huzefa Raja, 16-05-2012 17:50
Re : Pleosporale on indeterminate dicot. stems
Sure, I will see if I can find any more papers on this genus. 

Perhaps, you can send these picts to Robert A. Shoemaker in Canada, who has done some early work with this genus.

Best

Huzefa
Paul LEROY, 16-05-2012 19:58
Re : Pleosporale on indeterminate dicot. stems
Hello Enrique,
Je  pense moi aussi que ce champignon est probablement un Ophiobolus bien que
les ascomes ne soient pas collapsés.Toutefois,dans ma documentation je n'ai aucun
spécimen qui correspond à ce que tu représentes. Ceci est intéressant et j'aimerais
bien que quelqu'un l'identifie. Il pourrait aussi être cherché vers Nodulosphaeria ou
Entodesmium mais certains caractères ne conviennent pas.
Amicalement
Paul LEROY
Björn Wergen, 16-05-2012 20:19
Björn Wergen
Re : Pleosporale on indeterminate dicot. stems
This one is not easy to identify, as I said via email. Macroscopically it could be necessary to look for "subiculum" hyphae and microscopically it is important to see what happens with the spores after leaving the asci (part spores?) and which cell is enlarged.

I cannot find any matching species.

regards,
björn
Enrique Rubio, 16-05-2012 20:40
Enrique Rubio
Re : Pleosporale on indeterminate dicot. stems
I could have seen only some free ascospores out of the asci, and they were entire, no part spores.
Martin Bemmann, 16-05-2012 20:47
Martin Bemmann
Re : Pleosporale on indeterminate dicot. stems
Hi Enrique,

another species that vanished from the screen is Leptosphaeriopsis acuminata (not listet by IF or MB but depicted by Berlese - see attachment-).  But it still has mor septa in the spores.
Do you have Müller's work on Ophiobolus? Maybe it will not help much, I did not find a match to your find.

Regards

Martin
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Enrique Rubio, 16-05-2012 20:58
Enrique Rubio
Re : Pleosporale on indeterminate dicot. stems
No Martin. I have not Müller's work.
Thanks!
Luc Bailly, 16-05-2012 22:32
Luc Bailly
Re : Pleosporale on indeterminate dicot. stems
Hello all,
I don't recognize Ophiobolus acuminatus in Enrique's sample. There's a shema of the spores in Ellis & Ellis, and it's quite clear: the enlarged cells are close to the middle, and the spores divide in two halves when poking out the ascus.
I found O. acuminatus in 2011 in a bog, on Cirsium palustre.

Cheers - LUC.
Martin Bemmann, 16-05-2012 22:44
Martin Bemmann
Re : Pleosporale on indeterminate dicot. stems
d'accord Luc...
Björn Wergen, 16-05-2012 23:41
Björn Wergen
Re : Pleosporale on indeterminate dicot. stems
O. acuminatus is one of the commonest fungi growing on dead Cirsium stems. I have examined it several times (until it had became boring). :D

THIS one is definitive not O. acuminatus. 


I think Enrique's recolt is a new species, not yet described. That's all.

regards,
björn
Enrique Rubio, 17-05-2012 17:59
Enrique Rubio
Re : Pleosporale on indeterminate dicot. stems
Clearly is not Ophiobolus acuminatus.
Thank you to all
Enrique
Mlcoch Patrik, 30-11-2016 21:47
Mlcoch Patrik
Re : Pleosporale on indeterminate dicot. stems
This is possible something from genus Leptosphaeria. for example L. tenera agg. What to substrate?