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23-09-2025 13:31

"Bertia-like" Sordariales on Typha - Denmark
Thomas Læssøe

https://svampe.databasen.org/observations/10534623

15-10-2025 16:39

Tiny white apothecia on Populus inner bark
Edvin Johannesen Edvin Johannesen

These tiny (0.2-0.6 mm), white, pulvinate apotheci

03-10-2025 13:44

Unknown on Populus -> Pyxidiophora species
Riet van Oosten Riet van Oosten

Hello, Found by Laurens van der Linde on Populus

13-10-2025 19:05

Blanc sur tronc décortiqué
Louis DENY

Bonjour forumSur tronc décortiqué de feuillu x,

17-02-2013 21:11

Search
Peter Welt Peter Welt

Jamoni, P.G. 1998. Un nuovo discomicete coprofilo

11-10-2025 20:27

On Robinia pseudoacasia
Marcel Heyligen Marcel Heyligen

Found on a barked branch, 14 mm in diameter, of Ro

11-10-2025 14:20

Chromelosporium
Jean-Luc Ranger

bonjour à tous, Je ne vois pas comment l'on peut

09-10-2025 22:14

Hymenoscphyus or Bryoscyphus? Yellow cup / white stipe
S. Rebecca

We just had the Bavarian Mycology Conference in Au

10-10-2025 00:49

Amicodisca svrcekii ?
Ethan Crenson

Hello all, This was found last weekend on a hardw

06-10-2025 15:57

Lophiostoma
David Chapados David Chapados

Hi, Could anyone help me with this Lophiostoma? 

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Hymenoscyphus like
Khomenko Igor, 01-06-2021 17:48
Khomenko IgorHi,
I recently found these three Hymenoscyphus around Ottawa, ON, Canada, and I was unable to identify them by myself. I still have fresh material in a fridge if something needs to be rechecked.
If someone could help with all or some of them I will be very appreciative.

#1 Hymenoscyphus Cudoniella group?
On buried wood.
https://inaturalist.org/observations/80770446


#2
On rotten leaves (probably Acer).
https://inaturalist.org/observations/80526192


#3
On rotten leaves (probably Betula).
https://inaturalist.org/observations/80526469  A-inamyloid
https://inaturalist.org/observations/81606383  B-amyloid


Thank you for your help,
Igor

  • message #69000
  • message #69000
  • message #69000
Hans-Otto Baral, 01-06-2021 21:51
Hans-Otto Baral
Re : Hymenoscyphus like
Hi Igor

the first seems to be H. kathiae.

The second reminds me a bit of H. repandus, but that is probably wrong.

The third should be H. immutabilis.

Zotto
Khomenko Igor, 02-06-2021 06:17
Khomenko Igor
Re : Hymenoscyphus like
Thank you Zotto.

These H. kathiae and H. immutabilis are different. I've previously seen H. kathiae with larger spores and H. immutabilis IKI+ only.
I haven't seen true H. repandus, so I will need to do more reading.

Igor
Hans-Otto Baral, 02-06-2021 08:51
Hans-Otto Baral
Re : Hymenoscyphus like
The kathiae spores are a bit short, yes, but I think it comes close, perhaps variation. The species was described in the US but is frequent also in Europe, though less that the similar H. imberbis.

H. immutabilis is IKI+, yes. Anyway, I know cases where the iodine reaction is variable, e.g. in Phaeohelotium epiphyllum.
Michel Hairaud, 03-06-2021 15:27
Michel Hairaud
Re : Hymenoscyphus like
Bonjour Igor, 
Il n'y a pas du tout de couche gélatineuse autour des jeunes apothécies de ta récolte N°3 ? 

Amitiés.Michel
Khomenko Igor, 03-06-2021 21:53
Khomenko Igor
Re : Hymenoscyphus like
Michel, I made a sectional of #3 and it was easy to cut, so I don't think there is any gelatinous layer, but I'm not good with sectional nor textura.

Thank you Zotto, I understand that IKI reaction does not determine the species, but the presence of croziers does and I have croziers in #3 (H. immutabilis). I got strong IKI+b after KOH for #3, but I'm not certain that this is the right type, but maybe I shouldn't expect the same look of apical apparatus after KOH.


I uploaded pictures of #3 https://inaturalist.org/observations/80526469

Hans-Otto Baral, 03-06-2021 22:33
Hans-Otto Baral
Re : Hymenoscyphus like
Your section is good, the prismatic structure could be o.k. or not, I am not sure. But the amyloid rings are a surprise! Your Lugol photo shows a high iodine concentration. Could it be that the apos that you now studied were also amyloid without KOH?
Khomenko Igor, 03-06-2021 23:58
Khomenko Igor
Re : Hymenoscyphus like
Zotto, you are right.
I'm getting an amyloid reaction from the specimen from one leaf (with or without KOH).
And I retested the specimen from the first leaf, I'm getting only an inamyloid reaction (with and without KOH).
They all look the same to me, but I'm getting a different reaction. They are from different spots of the same forest.
Should I treat them as two different species?
Hans-Otto Baral, 04-06-2021 08:07
Hans-Otto Baral
Re : Hymenoscyphus like
I believe when there are no correlated features I would not think they are different taxa. With DNA we could find out this and also more about the identity of this collection.
Khomenko Igor, 06-06-2021 18:36
Khomenko Igor
Re : Hymenoscyphus like
Thanks again Zotto.
I split them into two collections IKI+ and IKI-. I'm going to keep specimens if someone wants to study them in the future.