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27-03-2024 22:53

Charles Aron Charles Aron

Hi All,Recently I came across these minute, setose

26-03-2024 17:14

Juuso Äikäs

These little black ascos were growing on a dead, d

25-03-2024 13:41

B Shelbourne B Shelbourne

• Hyaloscyphaceae (no VBs), Hyaloscypha: Macro a

25-03-2024 21:27

Riet van Oosten Riet van Oosten

Hello, Found by Laurens van der Linde, March 2024

26-03-2024 14:37

DAVID MARCOS DAVID MARCOS

Spores (telles qu'elles apparaissent à l'intérie

24-03-2024 08:27

Thierry Blondelle Thierry Blondelle

HiOn Hedera helix fallen branchEcological habitat:

26-03-2024 11:06

michel bertrand

Bonjour, Malgré de nombreuses recherches, je n'a

25-03-2024 14:08

Ursula Kozik

Bonjour et bonne journée, On m'a envoyé une tro

25-03-2024 03:56

B Shelbourne B Shelbourne

• Scuttelinia: Macro and habitat.• S. scutella

25-03-2024 20:21

DAVID MARCOS DAVID MARCOS

Bonjour, je m'appelle David et je débute dans l'i

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Tiny discos on Populus
Juuso Äikäs, 17-04-2021 19:34
This Thursday I found some tiny discos growing on the upper side of a fallen, well-decayed tree (probably Populus tremula). 

The spores measure 9.4 - 13.1 × 3.9 - 4.2.

Any idea what might be the species/genus?
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Hans-Otto Baral, 18-04-2021 16:10
Hans-Otto Baral
Re : Tiny discos on Populus
This would require a section. Is the excipulum porrecta? gelatinized?

Perhaps a Hyaloscypha (minuta, intacta...)?
Juuso Äikäs, 19-04-2021 15:20
Re : Tiny discos on Populus
Thank you for the reply.

Unfortunately these are so small that I won't be able to make a section. But I studied the sample a bit more.

Some spores have a septum and there is a rection with the excipulum and the margin with Melzers'. I measured three asci and they were 57 - 65 × 9 - 10.5 (H2O). 

H. minuta isn't found on our species list or in the monograph, but H. intacta is. It seems to fit in other parts, but there weren't even short hairs to be found. Is there a hairless version of this?
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  • message #68515
  • message #68515
  • message #68515
Hans-Otto Baral, 19-04-2021 16:15
Hans-Otto Baral
Re : Tiny discos on Populus
H. minuta is newly combined and you find it in my Hyaloscypha folder. Yes, it is a hairless member or may have very very short hairs. It is not easy to be separated from H. intacta. Sequences exist, and as a preliminary result the two species are the same. Of course, the types are relevant in this concern. That of H. minuta I have redescribed in detail, and that of intacta Seppo has.

Strange is that the two species were described in the same year.

B.t.w., dextrinoid reactions of the ectal excipulum have variously been recorded by Huhtinen.