Mollisia on Typha_angustifolia

30-08-2024 20:06

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Mollisia on Typha_angustifolia

Dirk Gerstner, 30-08-2024 20:06

Mollisia on Typha_angustifolia

I found the following small Mollisia on 25.08.2024 on 'last year's' Typha at the edge of a pond.
The growth point was at the base of the stem lying in the water.
Steinbach, MTB 6507,23, approx. 400m altitude.

Diameter of the apothecia approx. 0.6 to 0.8mm,
Apices pulvinate when young, later flattened. Grey-blue to grey-brown, sometimes with lighter centre.

Asci approx. 64 x 7 ym, hooks +,difficult to recognise.
Porus reaction +bb
Paraphylls with refractive vacuoles KOH-
Marginal cells variously shaped, expiculum cells spherical
Spores OCI 2- 3, club-shaped
Spores [95% - 23 - QPr - v - H2O(nat) ] = 9.2 - 11 - 12.7 x 1.9 - 2.6 - 3.3 µm;

lav x bav = 11 ±0.36 x 2.6 ±0.13 µm, Qav = 4.2 ±0.18

According to the key from Ingo Wagner I ended up with 'Mollisia poaeoides Rehm 1891'.

What is your opinion?
Many thanks in advance

Best regards
Dirk

Hans-Otto Baral, 30-08-2024 20:29

Re : Mollisia on Typha_angustifolia

The spores remind me of M. hydrophila but there must be numerous crystals in the medulla.

Dirk Gerstner, 30-08-2024 21:06

Re : Mollisia on Typha_angustifolia

Hello Zotto, thank you very much for your quick reply.

I would have taken a wrong turn here with the key
1120 not on Phragmitis (reed) --> 1130
1120* on Phragmitis (reed) --> Mollisia hydrophila
Spores 9-12(15?) x 2-2.6, KOH- or KOH+

But I have crushed a whole apo here and if that passes as crystals? OK
I looked in your folder and can't really imagine what crystals are there, sorry.

Best regards
Dirk

Hans-Otto Baral, 30-08-2024 21:31

Re : Mollisia on Typha_angustifolia

best is to make a median section. There are many photos in my folder of species with crystals. They usually form large druses and are abundant.

E.g.:

Mollisia hydrophila, HB 8508a-2.jpg

Le Gal & Mangenot 1961 Contribution a l'etude de Mollisoidees IV (3e serie) lr.compressed_59.jpg

Mollisia mediella, HB 3453-2a KOH.JPG

Dirk Gerstner, 30-08-2024 22:05

Re : Mollisia on Typha_angustifolia

Hi, there are crystals but not the amount that Le Gall draws.
And not the quantity shown in 8508a.
You can see a subbiculum carpet on the underside of the apos, but there is nothing on the substrate.

Thanks again and best regards
Dirk

Hans-Otto Baral, 31-08-2024 09:13

Re : Mollisia on Typha_angustifolia

Good section! Not sure if there are crystals at all. They are always inside the apothecium, not among the subiculum.

M- hydrophila is a difficut species because there exist some with KOH yellow reaction and some without. But maybe yours is not related to any of these.

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