Hysterioid on Picea - Forum ASCOFrance

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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?

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.

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