Mytilinidion on Picea - Forum ASCOFrance

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Mytilinidion on Picea

Juuso Äikäs, 27-02-2022 13:11

This Mytilinidion(?) species was growing at the black, resinous base of a dead, thin branch of Picea abies that was still attached to the living tree. It was growing together with Sarea difformis.

The spores are 4-celled and measure 18.4 - 23.5 × 5.6 - 6.6 µm. Asci bitunicate, no iodine reactions in Lugol's solution.

Any ideas what the species might be?

Alain GARDIENNET, 27-02-2022 22:38

Re : Mytilinidion on Picea

Hello Juuso,
It seems to be very close to Mytilinidion tortile.
If you have enough material, I would be happy to study it.
Alain GARDIENNET
14vrue roulette 21260 VERONNES
France

Juuso Äikäs, 28-02-2022 06:57

Re : Mytilinidion on Picea

Thanks for the reply and offer! After some searching M. tortile was actually my best candidate, but the spores are a bit on the large side. I probably could send you the sample this week.

Gernot Friebes, 28-02-2022 09:51

Re : Mytilinidion on Picea

Hi,

I know similar collections on resin and they might be somewhat close to Mytilinidion resinicola, although that species is described as having spores with constricted septa, which I have never clearly observed in my material. Some years ago I sent photos to Eric Boehm and he confirmed that M. resinicola might be the best name to use for these collections.
I am curious to hear your results, Alain.

Best wishes,
Gernot

Juuso Äikäs, 28-02-2022 14:05

Re : Mytilinidion on Picea

The sample is now posted, but it might take some time, since it's an economy letter.

I found one key that stated that M. resinicola is a North American species, but who knows. The name sounds promising :).

Adam Polhorský, 28-02-2022 14:24

Re : Mytilinidion on Picea

Hey everyone,

I know this species aswell, it is fairly common on blackened Picea abies resin, usually from higher altitudes. One collection from friend is on Abies alba. It can grow together with Lophium mytilinum, but that one is larger and more conchate.

I've got sequences from two cultures. In LSU there is about 4% (30nt) difference to either M. tortile, M.resinicola or Lophium arboricola. In spore morphology, there are clear and constant differences to these species.

In time we could put these collections together, if you would be interested.

bw,

Adam

Alain GARDIENNET, 28-02-2022 21:17

Re : Mytilinidion on Picea

Good news !

My idea was indeed that it could be a new species. Indeed, not only the morphology and the size of the ascospores is different from the known species quoted, but also the morphology of the ascomata. Adam's answer confirms me. We can compare the results. I will contact you privately.
Alain

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