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Benoît Segerer

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Unknown species on equisetum species
Ralph Vandiest, 10-10-2014 22:16
Ralph Vandiest

Hello,


I found this species in large numbers on some kind of equisetum. Size 0,35mm high, 0,25mm wide. Asci 70x10? => didin't see acsi edges. Spores 3 septated 21/27x4/5µm. Any suggestions?


Regards,


 


Ralph

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Christian Lechat, 11-10-2014 04:25
Christian Lechat
Re : Unknown species on equisetum species
Hi Ralph,
did you check changing of colour in lactic acid?

Regards,
Christian
Alain GARDIENNET, 11-10-2014 06:51
Alain GARDIENNET
Re : Unknown species on equisetum species

Yes, Christian is thinking at Gibberella. A vertical section will show the bluish-purple color of the peridium becoming dark purple in KOH and red in lactic acid, is it exact Christian ?


I think it's not a strict equisiticolous species.


Alain

Ralph Vandiest, 11-10-2014 12:39
Ralph Vandiest
Re : Unknown species on equisetum species
Hello Christian & Alain,

I have no lactid acid or KOH, (only so far Lugol, Melzer, Congo-R and Blue cotton), but I made a section and indeed its deep purple/blue coloured. Is it necesarry for determination to test with KOH? If you take into account 3-septated (hyaline) spores that are up to 5µm wide then I arrive at Gibberella zeae (not taken into account the few spores that where longer than 25µm (up to 27µm).What do you think?

regards,


Ralph
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