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26-03-2024 17:14

Juuso Äikäs

These little black ascos were growing on a dead, d

27-03-2024 22:53

Charles Aron Charles Aron

Hi All,Recently I came across these minute, setose

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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Helicogonium?
Stefan Jakobsson, 09-06-2021 02:26
I collected a Trichopezizella rubroguttata (with croziers) on wet culms of Filipendula. The strange thing about it is that it has two kinds of asci and two kinds of spores.

When thinking about that I found the intrahymenial parasite Helicogonium about which I knew nothing beforehand. I have observed no ascoconidia and no anamorphs. The asci are 30.0 - 33.8 × 6.1 - 7.20 and spores in asci are on avg. 7.8 × 2.0 µm.


Am I on the right track - is this a Helicogonium? If so, does it have a name? I am aware of only one old Helicogonium collection from Finland, collected in 1851.

  • message #69073
  • message #69073
Viktorie Halasu, 09-06-2021 02:56
Viktorie Halasu
Re : Helicogonium?
Hello,

the asci are too short and there are no lanceolate paraphyses. Isn't it possible, that one of those small apothecia of Olla cf millepunctata got mixed into your Trichopezizella preparate? 

Viktorie
Hans-Otto Baral, 09-06-2021 07:50
Hans-Otto Baral
Re : Helicogonium?
The brown cells look strange for an Olla. But these asci were amyloid, were they? Helicogonium has inamyloid asci with more rounded apex.
Viktorie Halasu, 09-06-2021 09:06
Viktorie Halasu
Re : Helicogonium?
But there's this variety with dark maroon excipulum cells - Olla scrupulosa var. obscura. Do you consider it to belong to Olla or elsewhere?
Hans-Otto Baral, 09-06-2021 09:26
Hans-Otto Baral
Re : Helicogonium?
I cannot remember this var. obscura description, but you are right, in HB 1671 I sketched a brown exciple and was thinking that associated smaller hyaline apos (1670) were another species. But that was in 1977.... A similar sample with brown cells but small apos was HB 6068c which I considered the same as 1671. These brown-celled populations appear to be rarer than the hyaline ones.
Viktorie Halasu, 09-06-2021 09:29
Hans-Otto Baral, 09-06-2021 09:46
Hans-Otto Baral
Re : Helicogonium?
Thanks for the pdf. I made a new folder for the two samples.
Stefan Jakobsson, 09-06-2021 16:15
Re : Helicogonium?
You are right, I had a mixed preparation. The small light colored apos are typical Olla millepunctatata. However, on the small dark ones I can't find any refractive/dextrinoid hairs, so it cannot be an Olla.

The asci are now 31-44 × 5.5-7.3 and the spores 7.9-8.7 × 1.9-2.6. Perhaps something around Pyrenopeziza atrata?

  • message #69083
  • message #69083
Hans-Otto Baral, 09-06-2021 16:16
Hans-Otto Baral
Re : Helicogonium?
Yes, in this direction.