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20-06-2025 08:33

Josep Torres Josep Torres

Hello.Small, blackish, mucronated surface grains s

28-06-2025 16:00

Josep Torres Josep Torres

Hello.A tiny fungus shaped like globose black grai

04-07-2025 12:43

Castillo Joseba Castillo Joseba

me mandan el material seco de Galicia (España) 

03-07-2025 18:40

Castillo Joseba Castillo Joseba

me mandas el material seco de Galicia (España) re

03-07-2025 20:08

Francois Guay Francois Guay

I found this interesting yellowish asco growing on

01-07-2025 23:37

Josep Torres Josep Torres

Hello.A Pleosporal symbiotic organism located and

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

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Orbilia sarraziniana or Orbilia luteorubella ?
Ethan Crenson, 30-05-2024 07:23
Did I pay close attention to the lecture Zotto gave two weekends ago? Here's my chance to find out.

This Orbilia is from a decorticated branch of hardwood, probably found on the ground (it was not my collection, it was handed to me) from a New York City park last weekend.

I initially thought it might be Orbilia luteorubella, but after staring for a while at the orientation of the spores in the asci I have changed my opinion. Now I tend to think that it is Orbilia sarraziniana.

Spores:
fusiform-clavate, with one acute end and one rounded end. The spore body a long, sometimes winding form ending at the pointed end of the spore:
4.9-7.5 x 1.3-1.6µm.

The spore body 2-4µm in length

Asci:
22.9-27.7 x 3.4-3.9µm (I know this probably seems short.)
truncate apex, furcate base. It looks to me that the upper spores have spore bodies at the bottom, lower spores with spore bodies up.


Paraphyses
capitate, with material covering the apex
19.8 x 3.1µm



I don't have images of the conidia, unfortunately. In fact, the bulb blew on my microscope and I am waiting for a replacement, so I can't check for them until the replacement bulb comes in the mail.



Is it possible to tell from this evidence?



Many thanks in advance,



Ethan
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Hans-Otto Baral, 30-05-2024 09:36
Hans-Otto Baral
Re : Orbilia sarraziniana or Orbilia luteorubella ?
Hi Ethan

indeed I would classify this as O. sarraziniana. Besides spore orientation O. luteorubella and O. rosea have longer spores, though this much overlaps.

Although the upper spores are oriented inversely I would anyway speak of the acute spore end with the SB as the upper end and orient them also on plates with SB upwards. 

We had some collections of this group in which there was much variation with both directions occurring near the ascus apex and at the lower end of the pars sporifera.

So the place of the SB is the indication, and you can imagine when dealing with dead spores you may easily think the acute end is the lower end.

Zotto
Ethan Crenson, 30-05-2024 14:41
Re : Orbilia sarraziniana or Orbilia luteorubella ?
Hi Zotto,

Thank you as always for your help!

Ethan