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21-03-2026 22:59

Hysteriaceae ??
Petr Soucek

Good evening, I would appreciate some advice on th

21-03-2026 15:13

MYXOMYCETICOLOUS FUNGI
Lepista Zacarias

Hello everyone, Does any one know of any literatu

20-03-2026 12:53

Eutypa spec. (?)
Stefan Blaser

Hello everybody, In the field, from distance, my

20-10-2017 09:23

Hymenoscyphus ¿calycinoides?
Garcia Susana

Este otro crecía en el mismo trocito de madera qu

20-03-2026 16:16

Pseudomassaria-like on Cornus alba
Edvin Johannesen Edvin Johannesen

These 0.5 mm diam. acervuli were breaking through

19-03-2026 19:34

Xylariaceae? on Carpinus betulus wood
Filip Fuljer Filip Fuljer

Hello everyone,a few days ago I collected this str

19-03-2026 18:25

Myriosclerotinia curreyana?
William Slosse William Slosse

Good evening everyone, On 18/03/26 I found a few

17-03-2026 10:09

Lasiobelonium corticale ?
François Freléchoux François Freléchoux

Bonjour, Voici la description rapide d'un petit d

19-03-2026 15:58

"Lasiosphaerioid"
Stefan Blaser

Hello everybody, I hope for some hints... Macro:

19-03-2026 17:50

Massarina on Corylus
Enrique Rubio Enrique Rubio

Hi to everybodyThese thiny, blackish pseudothecia

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Helotiale on Platanus leaves
Nick Aplin, 29-04-2016 00:58
Salut à tous,

Hopefully there is someone here that can help me with this inconspicuous species I collected on the underside of Platanus x hispanica leaves on 24/4/2016:

Apothecia up to 0.4mm, smooth to densely hairy


51.128851°N, -0.152131°W 70 metres above sea level


Ascospores 8.1-10.5 x 2.9-4 µm, smooth, hyaline, aseptate, with few small droplets

Asci with croziers, IKI light blue, possibly with Hymenoscypus type ring (?)

Paraphyses with single elongated, +/- refractive vacuole

Hairs when present clavate, smooth, up to 3-septate, end cell with single vacoule.

I have no idea where this species belongs, so any hints whatsoever would be much appreciated!


Amitiés,
Nick

  • message #42338
  • message #42338
Stip Helleman, 29-04-2016 01:39
Stip Helleman
Re : Helotiale on Platanus leaves
Hi Nick,
the apical ring looks more Sclerotinaceous to me but about the genus I have currently no idea.

cheers,
Stip
Hans-Otto Baral, 29-04-2016 07:44
Hans-Otto Baral
Re : Helotiale on Platanus leaves
Hi Nich & Stip
this looks indeed a bit sclerotiniaceous, mainly the basal amyloid protrusion. Could you please characterise the excipulum? Possibly the fungus is related to Moellerodiscus, though being very small and apparently sessile.
Zotto
Nick Aplin, 30-04-2016 00:52
Re : Helotiale on Platanus leaves
Hi Zotto & Stip,

Thanks for the advice. I had briefly considered Sclerotiniaceae but ended up getting nowhere.

I must admit I haven't grasped the terminology to describe the excipulum, so I'm hoping the picture helps....If not, I can try some more sectioning but I fear I'll end up with less than ten fingers :)

You can see the outside of the apothecium is a rosy-brown colour and which darkens lower down. The point of attachment is black.

Cheers,
Nick
  • message #42355
Hans-Otto Baral, 30-04-2016 08:15
Hans-Otto Baral
Re : Helotiale on Platanus leaves
This is fine! I think the isodiametric cell shape at the flanks and the colour of the cell walls would not contradict my idea of a Moellerodiscus. But that genus is really difficult and badly studied.

I see there was a similar case of sessile ?Moellerodiscus growing on a twig of Ligustrum which I could study only in the dead state.
  • message #42357
Lothar Krieglsteiner, 30-04-2016 23:19
Lothar Krieglsteiner
Re : Helotiale on Platanus leaves

Hi Zotto,


ah - I remember this. I think it grew together with Tympanis ligustri there.


Regards from Lothar