Ascomycete on Magnolia - Forum ASCOFrance

15-05-2024 10:54

Literature request

Viktorie Halasu

Hello, would anyone have this paper please? I did

14-05-2024 19:48

Possible Hymenoscyphus menthae

B Shelbourne

• Hymenoscyphus: Habitat, macro, spores, paraphy

10-05-2024 17:40

Nitschkia, no! It's a lichen

Anna Klos

Good afternoon, Thursday during an inventory we f

14-05-2024 09:19

Presentation about Orbilia

Hans-Otto Baral

Hi, I want to announce for next Sunday 17.00 middl

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Tubercularia vulgaris ?

Thierry Blondelle

Bonjour,A côté de Hystérographium fraxini, ces

14-05-2024 09:50

On Populus

Yannick Mourgues

Hi. Found on decorticated wod of Populus cf. alba

13-05-2024 12:48

Apiosporous pyrenomycete

Eduard Osieck

After eight years (*) I found the same apiosporous

11-05-2024 18:08

Possible Mollisia nervicola

B Shelbourne

• Mollisia on tree leaves: On dead Quercus leave

12-05-2024 11:48

Hypoderma (?) sur Euphorbia hyberna

Michel Hairaud

Bonjour , Voici une récolte d'une Rhytismataceae

11-05-2024 00:33

asco possibly Encoelia-like, reviving after drying out and rehydrating

Ethan Crenson

I'm not entirely sure that Encoelia-like is the ri

Ascomycete on Magnolia

Gernot Friebes, 24-01-2019 13:59

Hi,

we need your help with this curious ascomycete on twigs of Magnolia. Here are a few key characters:

-) Ascomata glabrous, non-stromatic, sitting rather loosely on/between conidiophores of a hyphomycete (asexual morph of the same species?)
-) Asci apparently bitunicate, reaction strongly to IKI, maybe with a slight amyloid reaction of the (inner?) wall
-) Ascospores faintly striate, 12.5-14 x 4.3-5.2 µm

Thanks for any ideas!

Best wishes,
Gernot

Viktorie Halasu, 24-01-2019 14:44

Re : Ascomycete on Magnolia

Dear Gernot,

Letendraea helminthicola looks a lot similar (based on Ellis & Ellis). I don't know what other species are in this genus.

Viktorie

Peter Wilberforce, 24-01-2019 15:52

Re : Ascomycete on Magnolia

Hello Germot,

I acompletely agree with Viktone that this is Letendraea. Ihave two collections of this seemingly rare ascomycete: once from Cumbria and recently from the gerden here in Argyll

Peter

Gernot Friebes, 24-01-2019 16:11

Re : Ascomycete on Magnolia

Hello, Viktorie & Peter,

thanks a lot for your help! I think the genus is pretty clear now indeed. I'm still a bit irritated by the faintly striate ascospores, however. After quickly reading through some descriptions of L. helminthicola I didn't find this feature mentioned, in fact two sources (Dennis in British Ascomycetes and Akulov 2015) explicitly write "smooth" regarding the spore surface. If anyone has further insight into this I would really appreciate it.

Best wishes,
Gernot

Viktorie Halasu, 24-01-2019 23:29

Re : Ascomycete on Magnolia

Hello Gernot,
could the ornamentation be soluble in some reagent, e.g. KOH, MLZ? Or either soluble or unstainable in LACB?
edit: Akulov used 3% KOH.
Viktorie

Gernot Friebes, 24-01-2019 23:40

Re : Ascomycete on Magnolia

Hello, Viktorie,

I would have to check that. For now all I can say is that the striation is very faint but still well visible in water; both myself and the person who collected the material observed it independently of each other. But if one doesn't look carefully it could certainly be missed.

Best wishes,
Gernot

Gernot Friebes, 28-01-2019 22:52

Re : Ascomycete on Magnolia

Among the Helminthosporium we also observed these tiny conidiomata with conidia measuring about 7.8–8.3 x 4.0–4.3 µm. Do you have any idea to which species they might belong?

Best wishes,
Gernot

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