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09-12-2019 12:05

PASCAL DUBOC

Bonjour cette colonie de pustules orange sur vieu

09-12-2019 21:35

William Slosse William Slosse

Yesterday I found this species on the underside of

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Stip Helleman Stip Helleman

Dear friends,is there anyone who has for me the ar

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Bonjour cette colonie de micro pustules noires l

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Lachnum on Fagus leaves
Enrique Rubio, 29-04-2015 14:19
Enrique Rubio

Hi to everybody


I would know your opinion about theis Lachnum species growing on Fagus leaves at the sea level


Please read the attached pdf


Many thanks again

Hans-Otto Baral, 29-04-2015 16:08
Hans-Otto Baral
Re : Lachnum on Fagus leaves
I have no idea but I doubt abour the crystals. I never saw crystals and VBs in combination. Do you have a photo of the crystals?
Enrique Rubio, 29-04-2015 17:34
Enrique Rubio
Re : Lachnum on Fagus leaves

Hi Zotto


Maybe the crystals are not true crystals but resinous exudate or even a mixture of both: exudate with minute acicular crystals because they are very easily removed of the tips and I cannot see free released crstals in the mountings.


Anyway, lacking crystals, do you know a foliicolous Lachnum with these characters?


Thanks in advance

  • message #35474
Enrique Rubio, 29-04-2015 18:01
Enrique Rubio
Re : Lachnum on Fagus leaves
Though it sounds strange, the material does not disappear in KOH 10%.
  • message #35475
  • message #35475
Hans-Otto Baral, 29-04-2015 20:02
Hans-Otto Baral
Re : Lachnum on Fagus leaves
Yes indeed. But true crystals look different. Did you test in CRB (aqueous)?
Sorry, I overlooked your third plate in the pdf. So clearly the material stains in CRB. This tells for a resinous exudate.
Enrique Rubio, 30-04-2015 17:00
Enrique Rubio
Re : Lachnum on Fagus leaves

Hi Zotto


Anyway you don't know this species, isn't?

Hans-Otto Baral, 30-04-2015 17:21
Hans-Otto Baral
Re : Lachnum on Fagus leaves
Actually not. Lachnum charretii (?= L. virgineum) is described with croziers, so is excluded.

Zotto
Enrique Rubio, 30-04-2015 17:23
Enrique Rubio
Re : Lachnum on Fagus leaves
Thanks Zotto. Thanks again
Michel Hairaud, 30-04-2015 18:42
Michel Hairaud
Re : Lachnum on Fagus leaves

Hi Enrique and Zotto ,


Did you compare this collection to Lachnum '' gemmarum'' ? But for the resinaceous lumps around hair tips, I find their macro and micro features  quite comparable .


Enrique, did you also search the leaves buds envelops where gemmarum is supposed to grow ?


Amitiés Michel


 

Hans-Otto Baral, 30-04-2015 18:46
Hans-Otto Baral
Re : Lachnum on Fagus leaves
Hi Michel

good idea! But I know L. gemmarum only without VBs.

Zotto
Enrique Rubio, 30-04-2015 19:20
Enrique Rubio
Re : Lachnum on Fagus leaves

Hi Michel


Wellcome to the matter! Yes. Macroscopically are quite similar but Zotto's pics show us more celled hairs narrowly attenuated towards their tips. Unfortunately I have never studied this common species on Fagus buds but I think the hairs of my collection are more regulary cylindrical only 1-2 septate and the paraphyses have Vbs as Zotto says.

Stip Helleman, 30-04-2015 20:52
Stip Helleman
Re : Lachnum on Fagus leaves
Hi Enrique,
excuser me for giving my opinion on this matter too.
I think it is more a Dasyscyphella although I can not find a matching species, the hairs are not typical but judging your photos show in CB Lactophenol some glandular apical cells. This is also matching with the dimorphism in the ascospores which is a feature of Dasyscyphella as well is the resinous exudate.
This gemmarum looks indeed somewhat related.
Stip
Enrique Rubio, 30-04-2015 20:59
Enrique Rubio
Re : Lachnum on Fagus leaves

Hi Stip. Do you think this is a Dasyscyphella with so fully granulate and regular hairs? I think these hairs are not very typical for this genus.


Thanks

Hans-Otto Baral, 30-04-2015 21:02
Hans-Otto Baral
Re : Lachnum on Fagus leaves
Hoi Stip

I need to object here that your suggestion sounds interesting but I never met a species of Dasyscyphella with VBs. Who knows...

Anyhow, I remember such excretions to have seen sometimes in Lachnum. In my pics I found some exudate on hairs of L. reynoutriae, for instance.

Zotto
Stip Helleman, 01-05-2015 06:50
Stip Helleman
Re : Lachnum on Fagus leaves
Hi Enrique et Zotto,
I was pointing to the similarities with Dasyscyphella, I had never seen a Lachnum with exudate. This looks for me as an intermediate species between Genera, it would be interesting to get a sequence out of it.

cheers
Stip
Enrique Rubio, 01-05-2015 16:04
Enrique Rubio
Re : Lachnum on Fagus leaves
Maybe, Stip. I'll keep you informed. Before we will make a test with polarized light searching for crystals.