Accès membres

Mot de passe perdu? S'inscrire

10-08-2022 15:45

Pierre-Yves Julien

Récolte le 31/07/2022 – Ozoir-la-Ferrière (77)

04-07-2022 18:45

Enrique Rubio Enrique Rubio

I can find no suitable answer for this white Bryos

11-08-2022 08:16

Josep Torres Josep Torres

Hola.Un muy diminuto Pirenomyceto sobre un tronco

11-08-2022 00:45

Stefan Jakobsson

On a thin deciduous stick (Salix/Alnus/Betula) on

10-08-2022 09:11

Josep Torres Josep Torres

Hola.Un Piremomyceto recogido este pasado domingo

10-08-2022 18:45

François Bartholomeeusen

Good evening all, On 5 August 2022, a friend gave

09-08-2022 20:06

Stephen Mifsud Stephen Mifsud

I have found an interesting aspergillus on flowers

06-08-2022 22:20

Marcus Yeo

I found this ascomycete today on dead leaves of Er

16-07-2022 17:01

Zetti Mario

Hi, I am doing some work with microfungi and durin

02-08-2022 17:48

Pierre-Yves Julien

Récolte le 31/07/2022 – Ozoir-la-Ferrière (77)

« < 1 2 3 4 5 > »
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

  • message #66343
  • message #66343
  • message #66343
  • message #66343
  • message #66343
  • message #66343
  • message #66343
  • message #66343
  • message #66343
  • message #66343
  • message #66343
  • message #66343
  • message #66343
  • message #66343
  • message #66343
  • message #66343
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.

  • message #66346
  • message #66346
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
  • message #66348
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

  • message #66351
  • message #66351
  • message #66351
  • message #66351
  • message #66351
  • message #66351
  • message #66351
  • message #66351
  • message #66351
  • message #66351
  • message #66351
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