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02-07-2025 17:26

Yanick BOULANGER

BonjourRécolté sur une brindille au fond d'un fo

02-07-2025 18:45

Elisabeth Stöckli

Bonsoir,Sur feuilles d'Osmunda regalis (Saulaie),

02-07-2025 09:32

Nicolas VAN VOOREN Nicolas VAN VOOREN

Hello, bonjour.Here is the paper I'm searching for

30-06-2025 16:56

Lydia Koelmans

Please can anyone tell me the species name of the

01-07-2025 23:37

Josep Torres Josep Torres

Hello.A Pleosporal symbiotic organism located and

30-06-2025 12:09

Edvin Johannesen Edvin Johannesen

This tiny, rather "rough" erumpent asco was found

30-06-2025 06:57

Ethan Crenson

Hi all, Another find by a friend yesterday in Bro

30-06-2025 19:05

ALAIN BOUVIER

Bonjour à toutes et à tousJe cherche à lire l'a

30-06-2025 14:45

Götz Palfner Götz Palfner

This is a quite common species on Nothofagus wood

25-06-2025 16:56

Philippe PELLICIER

Bonjour, pensez-vous que S. ceijpii soit le nom co

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Otidea from Mexico
Alan Rockefeller, 21-02-2013 01:39
Alan RockefellerI found this Otidea in Mexico under oaks.

http://mushroomobserver.org/images/960/280048.jpg

http://mushroomobserver.org/images/960/308999.jpg

Spores 2/3rds with 2 oil droplet and 1/3rd with one. Spore measurements:

10.2 [11 ; 11.4] 12.2 × 5.3 [5.7 ; 5.9] 6.3 µm
Q = 1.8 [1.9 ; 2] 2.1 ; N = 30 ; C = 95%
Me = 11.2 × 5.8 µm ; Qe = 1.9


Rarely (approx 1%) of the spores are up to 8 µm wide.


Asci with blunt tips. Paraphyses curly.

A video of spore release:

http://www.youtube.com/watch?v=HT_0UU7UgI0

More photos and micrographs:

http://mushroomobserver.org/115972

Any help with identification would be greatly appreciated. 

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Ibai Olariaga Ibarguren, 21-02-2013 02:57
Re : Otidea from Mexico

Hi Alan,

Thank you for this nice post! From what I can see in the photos, it looks very much like an undescribed species of Otidea close to O. formicarum, from which it differs clearly in the longer spores with higher length/width ratio, among other things. The apothecia with upper horizontal margin, dark brown colour, and especially, the spore size are very characteristic. I have seen only two herbarium specimens from Mexico, but never got to see good photos of living material. That is why your material is very interesting if I am in the right path.

Are the photos "pileipellis x 100" and "pileipellis x 400" taken in water?

Was not there any conifer tree in the collection site? The two collections I studied were made under Abies and Pinus.

If possible, I would be interested in studying the material to confirm the find. Many thanks in advance. ?

Cheers,

Ibai.

Alan Rockefeller, 21-02-2013 03:16
Alan Rockefeller
Re : Otidea from Mexico
The photos you asked about were mounted in KOH.  There were mostly oaks near the collection site, but there are a few pines around so it is possible that it is with Pinus.

I can have the collection mailed to you, let me know where to send it.

Thanks for the help!

Nicolas VAN VOOREN, 21-02-2013 08:13
Nicolas VAN VOOREN
Re : Otidea from Mexico
Well, I'm troubled because I proposed, on Mushroom Observer, Otidea bufonia as name, due to purplish tinges shown on some specimens. The habitat under oak was also possible for this species. I agree that the spore size is a bit small for typical bufonia.
Ibai, I do not recognize the Otidea close to formicarum that we discuss.
Maybe a new taxon...
Ibai Olariaga Ibarguren, 21-02-2013 09:36
Re : Otidea from Mexico

Hi Alan and Nicolas,

I agree that it resembles O. bufonia macroscopically. In fact, I thought it was O. bufonia at the first glance too! Besides having larger fusoid spores, O. bufonia should have dark brown crystals on the surface of the outer excipulum that partly convert into reddish particles in Melzer. The ecology would be OK, but it appears to occur only in Europe, so far. The crystals on the outer excipulum in the O. formicarum group are yellowish brown to yellow and convert into heterogeneous amber drops in Melzer. Yes Nicolas, very likely new...

I would need to check the material to be sure, though.  Alan, I will send my address privately. Thank you!

Cheers,

Ibai.

Ibai.