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17-04-2026 19:16

Small dark synnemata on rotten hardwood
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unknown discomycete on Alnus incana
Björn Wergen, 11-11-2023 00:15
Björn WergenDear friends,

In Balderschwang, near the border of Austria, we have found a small discomycete on dead wood of Alnus incana. I have checked several possibilities but I cannot get it closer as to the genus Strossmayeria. 

However, the most striking feature here are the budding, multiseptate spores.
46.8 - 48.45 (48.5) × 3 - 3.35 (3.4) µm; Q = 14.5 - 15.5 ; Me = 47.6 × 3.2 µm ; Qe = 15
asci 110 - 130 x 9 - 10 µm, H+, IKI+bb, 8sp
paraphyses 2.0 - 2.2 µm broad

fb 365 - 450 µm diam., in section appearing somewhat gelatinous.
kreiselförmig bis kurzstielig
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Any ideas welcome. Thanks.

regards
björn

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Hans-Otto Baral, 11-11-2023 09:52
Hans-Otto Baral
Re : unknown discomycete on Alnus incana
Hi Björn

there is a Strossmayeria alnicola in Iturriaga & Korf 1990, which has similar spores but Iturriaga 1984 states that all Strossmayeria spp. have inamyloid asci (with or without KOH) and also in 1990 I cannot find a hint on a species with an amyloid ring.

Apparently all species react blue in the marginal ectal excipulum and also the spores react bluish, at least when overmature. Perhaps MLZ is better to obtain this blue reaction.

There are no Pseudospiropes conidia which apparently all P. spp. have?

Zotto
Björn Wergen, 21-11-2023 14:55
Björn Wergen
Re : unknown discomycete on Alnus incana
Hi Zotto,
I have checked again, but I could not manage to find any reaction of anything to MLZ (except apical plugs).
I have not seen any Pseudospiropes conidia, but the species is accompanied by an anamorphous stage which looks somewhat similar, disc like and about 1mm diam. Photos attached.
Conidia of that anamorph: 
4.8 - 5.1 (5.5) × (1.2) 1.23 - 1.46 (1.5) µm; Q = (3.3) 3.34 - 4.1 (4.2) ; N = 10. Me = 5 × 1.4 µm ; Qe = 3.7.

regards
björn
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Hans-Otto Baral, 21-11-2023 17:15
Hans-Otto Baral
Re : unknown discomycete on Alnus incana
Hmm, I remember such an anamorph, but I think it is not related to the perfect state. Do you have a possibility to send a portion for sequencing? DGfM? It would make me curious with what this could be related.

Zotto
Björn Wergen, 21-11-2023 23:14
Björn Wergen
Re : unknown discomycete on Alnus incana
Not sure whom to send it. I could put it to the herbarium. Until anyone wants to study it.

regards
björn
Hans-Otto Baral, 22-11-2023 10:05
Hans-Otto Baral
Re : unknown discomycete on Alnus incana
o.k. No problem.
Björn Wergen, 09-01-2024 15:38
Björn Wergen
Re : unknown discomycete on Alnus incana
Hi Zotto,
I am quite sure it is the same as in Parachnopeziza, alaunae cf. 24-58 x 3-3.5 3-9-sept. P. gutt. I think that was found bei Ueli Graf?

regards
Hans-Otto Baral, 09-01-2024 17:06
Hans-Otto Baral
Re : unknown discomycete on Alnus incana
Very good idea! No, Ueli is UG, this one is by Urs Roffler (UR).

If you tell me the exact date then I can name your pics in my folder.
Björn Wergen, 09-01-2024 22:42
Björn Wergen
Re : unknown discomycete on Alnus incana
Here are the collection data:
On dead attached twig (partly without bark about 10cm diam.) of Alnus incana, Balderschwang, 06.11.23., leg. B. Wergen/K. Gilbert.
Hans-Otto Baral, 12-01-2024 17:39
Hans-Otto Baral
Re : unknown discomycete on Alnus incana
Gut, danke!