12-11-2024 16:43
Ethan CrensonHello all, This weekend a friend found these dark
11-11-2024 23:17
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Dark red discomycete on Betula - nematode trapping anamorph?
Ethan Crenson,
12-11-2024 16:43
Hello all,
This weekend a friend found these dark red cups on the cut end of Betula in the Northeastern US (Maine). In the field they appeared very dark, almost black and associated with a dark staining in the wood. Illuminated in the lab they appear dark red, quite small, the largest reaching about 0.25mm in diameter.
Spores: hyaline, clavate, 10-12.7 x 2.2-2.5µm, with one oil droplet at each end.
Asci: 46-55 x 6-7µm, IKI-
Paraphyses: narrow, usually curved at the ends
Red pigments in the form of an epithecium above the hymenium
An interesting synnematous anamorph that is growing with this disco appears to be trapping nematodes. There is also a black immersed pyrenomycete and another, light colored discomycete growing together with these dark red ascos, so it is possible the synnemata could be associated with either of those.
Does anyone have any ideas about this?
Thank you in advance,
Ethan
Hans-Otto Baral,
12-11-2024 17:09
Re : Dark red discomycete on Betula - nematode trapping anamorph?
Hi Ethan, my god!! This is a new genus and family to which also a very long. and multispored species belongs. It reminded me of Cordieritidaceae but its placement is very special, according to sequences obtained by Adam. The only described species related to them is Claussenomyces tympanoides, which is misplaced there.
Now this specimen should be sequenced I think, since we have two such species with different ITS and slightly different spore size. Would it be possible to send it to Adam? I am sure he would be happy.
You do not have a scale to your photos? I much appreciate that to be able to measure myself.
Ethan Crenson,
12-11-2024 17:37
Re : Dark red discomycete on Betula - nematode trapping anamorph?
Hello Zotto! Thank you for the information. That is very exciting! I would be happy to send a portion of the collection to Adam. I am drying some apothecia now to attempt a sequence for myself.
I tested the tissue in KOH and extracted red pigments. It is ionomidotic, I assume. I also made some images of the synnemata. All posted below.
I will measure and do a more thorough documentation this afternoon.
Thank you again!
Hans-Otto Baral,
12-11-2024 17:47
Re : Dark red discomycete on Betula - nematode trapping anamorph?
Ah, you want to sequence yourself! That would be sufficient!!
Yes, ionomidotic. The photos are in a new folder starting with 3f in Helotiales.
The anamorph could be Graphium caliciioides?