Orbilia on Celtis occidentalis

18-03-2026 13:09

Khomenko Igor

I recently examined Celtis occidentalis branches

18-03-2026 18:42

Arthothelium sp.

Gonzalez Garcia Marta

I have collected some lyre-shaped apothecia on the

18-03-2026 17:22

Literature search

Katarina Pastircakova

Hi there,I'm looking for the following literature:

27-11-2025 15:41

Hysteriales (Mytilinidion mytilinellum??) on Larix cone, with too? big spores - Denmark

Thomas Læssøe

Spores brownish, typically 4-celled; 26.8 x 2.4;

18-03-2026 11:52

Gnomonioid on petiole of Acer pseudoplatanus with 3-septate ascospores, Denmark

Thomas Læssøe

https://svampe.databasen.org/observations/10493688

11-03-2026 17:36

Help for Genus and Species ID

Michel Hairaud

Bonjour, Je cherche des indices pour cette réc

17-03-2026 10:40

Geopora sumneriana

Martine Vandeplanque

Bonjour à tous.Chaque année en mars ou avril, il

17-03-2026 19:41

Pyréno sur branche morte de chêne

Bernard CLESSE

Bonsoir à toutes et tous,Pourriez-vous m'aider à

12-03-2026 19:44

Ostropoloid fungus on Hibiscus

Enrique Rubio

Hi to everybody.Can you give me any suggestions ab

17-03-2026 10:09

Lasiobelonium corticale ?

François Freléchoux

Bonjour, Voici la description rapide d'un petit d

« < 1 2 3 4 5 > »

Orbilia on Celtis occidentalis

Khomenko Igor, 18-03-2026 13:09

I recently examined Celtis occidentalis branches and found two species of Orbilia.

One 16-spored species that remind me O. serpentina.
https://www.inaturalist.org/observations/342789668

The second probably 32-spored species that looks like O. palmicola.
https://www.inaturalist.org/observations/342772630

My location (I'm in Ottawa, ON Canada) suggests that there are something else. Maybe I missed something. I'm asking for the opinion.

Hans-Otto Baral, 18-03-2026 16:09

Re : Orbilia on Celtis occidentalis

Hi Igor

these are wonderful docus! I agree with both, my memory and comparison with the images leave no other option. O. palmicola is especially interesting as we had only one collection. I am quite sure that you would see a relatively thin apical thickening with ocular chamber in dead asci. The SBs are a little longer and narrower, I measured from your scale 1.5-2.5 x 0.8-1.1 µm.

Zotto

Khomenko Igor, 18-03-2026 22:23

Re : Orbilia on Celtis occidentalis

Thank you Zotto.

I checked Orbilia palmicola like species. I belive that I see thin apical thickening in asci in KOH (attached image).
For SBs, I'm getting the same size as you got.
*(1.2) 1.5 - 2.4 (2.7) × (0.8) 0.9 - 1.1 (1.2) µm
Q = (1.3) 1.6 - 2.5 (2.7) ; N = 32
Me = 2 × 1 µm ; Qe = 2

Igor

Accès membres

Forum AscoFrance