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Mot de passe perdu?

12-04-2026 17:56

Seeking genus for 1 – 3 septate spored asco. on herb Nepteta cataria (Mint).

Hardware Tony

Hardware Tony

Found on dead stems in February earlier this year

17-04-2026 19:16

Small dark synnemata on rotten hardwood

Enrique Rubio

Enrique Rubio

Hi to everybodyI would appreciate any assistance r

14-04-2026 05:32

Pyrenomycete with yellow subiculum on Aralia

Ethan Crenson

Hi all, A few weeks back a friend pointed out som

17-04-2026 15:14

sur feuilles de Luzula

Bruno CouÃ©

Bruno Coué

Bonjour.Récoltes du 16/04/2026, sur feuilles mort

12-04-2026 15:52

Anamorph on Salix

Gernot Friebes

Hi,I'm looking for help with this anamorph collect

14-04-2026 21:52

Thyriothecioid anamorph on Carex elata

Gernot Friebes

Hi,found on dead leaves of Carex elata. Conidia: 4

16-04-2026 22:09

Parorbiliopsis samarae?

Buckwheat Pete

Hello, I'd like to ask about this older specimen:

15-04-2026 19:33

Scutellinia cf. citrina

Fátima Durán Manzaneque

Hi!! I need help, I found this Ascomycete but I d

14-04-2026 20:31

Psilachnum lateritioalbum on Phragmites australis?

Gernot Friebes

Hi,can this be Psilachnum lateritioalbum on Phragm

12-04-2026 12:22

Unknown anamorph on Primula eliator

William Slosse

William Slosse

In a dune grassland in Oostduinkerke (Belgium), on

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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

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