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18-04-2025 21:54

Unknown aquatic pyrenomycete
Hartmut Schubert Hartmut Schubert

Hi Forum,I found this aquatic pyrenomycete a few d

19-04-2025 08:51

Unknown pyrenomycetous fungus growing on cowberry
Henri Koskinen

Could you help me in the right direction with this

16-04-2025 08:53

Anamorph on a leaf.
Josep Torres Josep Torres

Hello.An anamorph photographed under holm oaks thi

18-04-2025 23:16

Mollisia
Robin Pétermann Robin Pétermann

Bonjour, Voici une probable Mollisia, genre que j

18-04-2025 17:13

Helotiales on herbaceous stems
Francois Guay Francois Guay

I found this interesting reddish Helotiales growin

18-04-2025 11:34

Gelatinosa en Acacia
Castillo Joseba Castillo Joseba

Me mandan el material seco de Galicia (España), r

17-04-2025 23:03

Scutellinia
Yanick BOULANGER

BonsoirVoici un Scutellinia qui nous pose un probl

17-04-2025 18:31

Peziza ammophila / pseudoammophila ?
Giovanni ANTOLA Giovanni ANTOLA

Bonjour, J'aurais besoin d'aide avec ce pezizale

13-03-2025 19:16

Wood anatomy
Enrique Rubio Enrique Rubio

By means of these photographs could anyone identif

17-04-2025 15:37

Recherche matériel / Searching for material of Anthracobia macrocystis
Nicolas VAN VOOREN Nicolas VAN VOOREN

Bonjour.Je suis à la recherche de collections (rÃ

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Hysterioid on Picea
Juuso Äikäs, 12-02-2025 12:34
Yesterday I found some hysterioid fungi growing on the inner side of loosened bark attached to a dead, standing Picea abies trunk.

Asci bitunicate and 8-spored, spores brown and 4-celled, measuring:

18.6 - 22.9 × 6.0 - 7.5 µm, Q = 2.7 - 3.4; avg = 21.1 × 6.8 µm, Qav = 3.1, n = 5


This keyed out to Hysterium acuminatum, but that species is supposed to grow on deciduous wood.


Any thoughts what this might be?

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  • message #81574
  • message #81574
Ethan Crenson, 13-02-2025 18:07
Re : Hysterioid on Picea
Hi Juuso,

I'm interested to know what key you are using that arrives at H. acuminatum. Using Boehm's key I get to Hysterium angustatum. The spores do fall within the range, though looking at your images, some of them seem to be a bit broad. The Boehm key says "Phragmospores (12-) 14-21 (-28) x (3-)4-8(-10)µm, firmly 3 septate, no septal constrictions, end cells obtuse, cosmopolitan."   I don't find H. angustatum on Picea, but we don't have much spruce around here to begin with. 

Ethan
Adam Polhorský, 13-02-2025 18:15
Re : Hysterioid on Picea
Hi Juuso, without comparing too thoroughly this should be the common resinicolous Mytilinidion that appeared here several times. I think you also had it in the past. 

Adam
Juuso Äikäs, 13-02-2025 18:39
Re : Hysterioid on Picea
Hi Ethan,

I used the "Key to hysterioid fungi on bark and wood in Scandinavia" (found on Researchgate) as a key. I just read a little from the book Fungi of Temperate Europe (vol. 2), and it says about H. acuminatum that it is "Also knowns as H. angustatum".
Juuso Äikäs, 13-02-2025 18:41
Re : Hysterioid on Picea
Hi Adam,

yes, you could be right -- this could indeed be that same undescribed species. Since this wasn't growing on resin, this didn't occur to me earlier.
Ethan Crenson, 13-02-2025 19:14
Re : Hysterioid on Picea
Mytilinidion would make more sense on Picea. The macro photos look a lot like a Hysterium, not so much like a bivalve.  Very interesting.