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27-03-2024 22:53

Charles Aron Charles Aron

Hi All,Recently I came across these minute, setose

26-03-2024 17:14

Juuso Äikäs

These little black ascos were growing on a dead, d

25-03-2024 13:41

B Shelbourne B Shelbourne

• Hyaloscyphaceae (no VBs), Hyaloscypha: Macro a

25-03-2024 21:27

Riet van Oosten Riet van Oosten

Hello, Found by Laurens van der Linde, March 2024

26-03-2024 14:37

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Spores (telles qu'elles apparaissent à l'intérie

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Thierry Blondelle Thierry Blondelle

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B Shelbourne B Shelbourne

• Scuttelinia: Macro and habitat.• S. scutella

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Rutstroemia??
William Slosse, 06-12-2020 14:25
William SlosseHello everyone,

on November 26, 2020 I found an asco growing at the base of presumably Carex arenaria. The site is located in the gray dunes in Koksijde, Belgium (coastal area). The asco appeared in abundance and I think it could be a Rutstroemia.
Can somenone give me a clue?


Spores: elliptical; filled at the poles with clusters of droplets; Av 16.34x6.50µm (N = 17)


Asci: J-; uniseriated, 8-spored


Paraphyses: filiform; cilindric; sometimes branched at the top; multiseptated; finely encrusted (?); diameter on average around 3.17 µm


Hairs (?) or paraphyses on the edge: thick-walled; multiseptated; finely encrusted; tapered top; content colored.


The photo series in the same order with a final image of the outer excipulum.
All measurements were done in water.


Kind regards, William

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Enrique Rubio, 06-12-2020 14:54
Enrique Rubio
Re : Rutstroemia??
Hi William
Look for Rutstroemia maritima, The asci should have croziers.
Enrique
William Slosse, 06-12-2020 15:51
William Slosse
Re : Rutstroemia??
Hi Enrique,

Thanks for your comment.
The asci do indeed have croziers, but the host plant here is not Ammophila arenaria.
I do not know whether Rutstroemia maritima has also been observed on other dunegrass varieties.
Do you sometimes have information about that?

R. paludosa occurs on various grasses but has a distinct stem. Here, however, all fruiting bodies are sessile or with a very short stalk.

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Hans-Otto Baral, 06-12-2020 16:15
Hans-Otto Baral
Re : Rutstroemia??
Hi William

how can such a big apothecium grow out of such a thin culm? Wonderful!

Perhaps a cross section of the substrate would better clarify the host.

Did you test Lugol? Your Melzer did not even stain the plasma, perhaps too diluted.

Do you have the spore photos also without measures? I prefer to save clean images and a summary of the spore size instead.

R. maritima is not easy. There exist amyloid and inamyloid collections on Ammophila,  and R. calopus (with croziers) is therefore not clearly distinguished. You see in my Clarireedia folder also samples on Iris by Enrique, and a sequence of one of them (with slightly amyloid asci) differs from R. maritima F118839 (HB 6860) on Ammophila (asci inamyloid) by only 1 nt (0.2%), thus must be conspecific.

Although the morphology is so similar, genetically R. maritima is distant, see my phylotree.

Zotto
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William Slosse, 06-12-2020 19:20
William Slosse
Re : Rutstroemia??
Hi Zotto,

thx for your reaction.
In any case, the substrate consists of a grass, not Carex. I will not be able to find a new collection at the moment, due to the recent frost, but I still have some material, including substrate, in collection.
In Lugol I notice no reaction, see photos.
However, I did the test with Melzer again and let the material soak a little longer. I think I see a very small reaction in the ascus top.
I also add some pictures of spores taken in water.
Sincerely,
William

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Hans-Otto Baral, 06-12-2020 21:26
Hans-Otto Baral
Re : Rutstroemia??
o.k., the MLZ-pics show a yellowish-stained plasma, so iodine is present. Almost inamyloid anyhow. The Lugol-photos show no yellow at all, the concentration of iodine is too low to evoke a reaction.

Thanks for the spore photos. Your first micro-picture would also have been good. Spore size is summarized *15.7-18 x 6.2-7 µm. The smaller spores are dead or immature.

Also for me this looks like a Poaceae.
William Slosse, 07-12-2020 20:36
William Slosse
Re : Rutstroemia??
Ok, thanks, Hans-Otto.
I list the species as cf. Rutstroemia maritima because of its habitat and create an excicate.

Regards,
William