Accès membres

Mot de passe perdu?

17-09-2025 19:43

Lachnellula suecica ?

Philippe PELLICIER

Sur branche morte de Mélèze. Les ascospores sph�

17-09-2025 16:14

Philippe PELLICIER

Apothécies enterrées, fermées au début puis s'

17-09-2025 10:50

Ascomycete on Polystichum proliferum

Heather Merrylees

Hi there!I am hoping for any advice on the identif

11-09-2025 16:57

Marthamycetales revision published

Jason Karakehian

Jason Karakehian

Our revision of Marthamycetales (Leotiomycetes) is

16-09-2025 12:53

Encoeliopsis rhododendri

Philippe PELLICIER

Pézizes de 1-4 mm, brun grisâtres, sur les capsu

03-09-2025 12:44

Ascolichen on Blechnum?

Enrique Rubio

Enrique Rubio

Hi to somebody.I would like to know your opinion o

15-09-2025 14:40

Engler & Prantl, Nat. Pflanzenfam. (Ed. 2) 1938

Nicolas VAN VOOREN

Nicolas VAN VOOREN

Hello.I'm searching for a digital copy of the seco

14-09-2025 22:16

Cheilymenia stercorea

Philippe PELLICIER

Apothécies petites jusquà 3 mm, oranges, avec de

13-09-2025 14:01

Otidea platyspora or something else?

Thomas Flammer

dark brown apothecia, splitIKI-Spores biguttulate

10-09-2025 17:18

Pseudocoprotus catenipilus ???

Blasco Rafael

Blasco Rafael

Hola, encontre este estiercol de vaca estos apotec

« < 1 2 3 4 5 > »

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