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25-03-2026 10:35

Hulda Caroline Holte

Hello,I collected this species growing on a dead b

26-03-2026 15:31

Ãke Widgren Åke Widgren

Hello,I found this one in October last year, on r

26-03-2026 12:50

David Chapados David Chapados

Hi,I'm having a hard time figuring which Pseudombr

26-03-2026 11:17

Vasileios Kaounas Vasileios Kaounas

Found 11-03-26, in leaf of Ulmus sp. Diameter 2-4

25-03-2026 22:23

Marc Detollenaere Marc Detollenaere

Dear Forum,On a debarked stem of Tilia, we found s

24-03-2026 15:44

Åge Oterhals

I hope someone can confirm the name of this collec

25-03-2026 20:53

François Bartholomeeusen

Dear forum members,On 23 March 2026, I found sever

23-03-2026 20:16

Miguel Ãngel Ribes Miguel Ángel Ribes

Good eveningI'm unable to identify this Coprotus o

25-03-2026 15:06

Bernard CLESSE Bernard CLESSE

Bonjour à toutes et tous,Pourriez-vous me confirm

25-03-2026 13:54

Enrique Rubio Enrique Rubio

Does anyone know where I could download Paoletti's

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Orbilia pilifera?
Edvin Johannesen, 20-05-2021 17:27
Edvin Johannesen
Hi!

This beautiful pink Orbilia was growing on a thin Ulmus twig near Oslo, Norway. Apothecia 0.5-0.7 mm.  Margin almost dentate from bundles of glassy (?) hairs. I am struggling to see the spores clearly inside the asci, and even more difficulties photographing them with my simple setup, but they appear clavate-fusiform (rounded apically) with one apical SB occupying only a small area of the spore. It's difficult to see the shape of the SB, but definitely somewhat longer than wide. The paraphyses are septate, cylindrical and with a triangular exudate cap (stained in CR). Dead (?) asci are apically truncate. There are large, globose cells n the ectal excipulum. I am quite sure there are croziers.  And finally, there are bundles of glassy (?), elongate cells, presumably forming the dentate margin.

Are we in Section Piliferae and could it be O. pilifera?  I don't find the capped paraphyses mentioned for that species.  But the substrate host fits.

All micro images in CR in a drop of water, from fresh apothecium.
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Edvin Johannesen, 20-05-2021 17:28
Edvin Johannesen
Re : Orbilia pilifera?
Some more photos.
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Edvin Johannesen, 20-05-2021 17:31
Edvin Johannesen
Re : Orbilia pilifera?
Note: The first photo in the second part shows spore bodies in two spores and not an amyloid ascus apex!
Hans-Otto Baral, 20-05-2021 17:52
Hans-Otto Baral
Re : Orbilia pilifera?
These are typical glassy processes at the margin, and the ascus base is bifurcate but most probably never with croziers (the branches must be both attached to the same basal cell, then it would be a crozier).

I guess the spores were rather narrow, maybe 1,5 µm. Glassy processes exclude O. pilifera. I suggest this is Orbilia rubella.

Regrettably, everything is dead, except for the spores with SBs that you mention. Did you try a water mount?

Zotto
Edvin Johannesen, 20-05-2021 18:00
Edvin Johannesen
Re : Orbilia pilifera?
Thanks Zotto.  The material is fresh. I thought a drop of CR in water would't kill the asci etc. But I will try plain water. I have a problem with digital noise on the camera at high magnification, but will do my best.
Edvin Johannesen, 20-05-2021 18:36
Edvin Johannesen
Re : Orbilia pilifera?
I have studied the material in water and compared closely with O. rubella in you great epos, and it fits prefectly.  The spores are indeed 1-1.5 microns broad and the small, apical SBs are distinct, as well as the capped parafyses, glassy cells etc.  Thanks a lot!