On dead wood of Cytisus scoparius I found a group of tiny apothecia. Does anyone recognizes this species or is familiar with the group in which this species should be found?

Apothecia young barrel-shaped, dark brown and with a white flaky edge around the opening, older cup-shaped, up to 0.5 mm diam., dark brown with still the white edge present, sessile, base broadly attached to the substrate, base blackish brown, hymenium grey when young, older yellowish grey.
Spores 12,5-14,3 x 4,4-5,2 (10 spores meassured),
Asci 87-107x8,-9,5 ?m. J-, with clamps,
Paraphyses thread-like, septated, sometimes splitting, upto 2 ?m diam.
Excipulum composed of (only?) brown, globose thick-walled cells, towards de margin transitioning into hyphae, but I don't know whether this means the apothecia have marginal hairs,
The white flakes consist of microscopically small grains which release immediately in water.

Enrique Rubio, 14-11-2025 19:47

Re : Small species on Cytisus scoparius

Few years ago, we found the same fungus also on Cytisus scoparius, and it was sequenced. GenBank: PV477790.1

Hans-Otto Baral, 14-11-2025 20:37

Re : Small species on Cytisus scoparius

Yes, it is my folder "sanguineoatra-like Cytisus" in Skyttea. 

I wonder if KOH dissolves something from the red-brown excipulum.

JP Priou collected it on Cytisus in Bretagne and Alsac (JPP 2024120, JPP 28065), and Guy in Luxembourg on Cytisus (PP058118 Cordieritidaceae sp. G.M. 2023-07-18.1).

ITS sequences of Enrique, Guy and JP are 100% the same.

I was unaware of your sequence, Enrique, and do not have your pics. Are they online? Regrettably I have no pics from Guy.

Marian Jagers, 15-11-2025 16:40

Re : Small species on Cytisus scoparius

Adam, thanks for helping me. The collection is dried. If you still want it, I can send it to you.

Enrique and Zotto, Thanks also for your reply. It's a known species  (good to know), but apparently not officially described yet. 

Zotto, indeed, when I checked whether the granules would dissolve in KOH, to my surprise, most of the tissue dissolved. I found this rather strange that I was reluctant to mention it (and also to avoid wasting apothecia). I thought I'd wait and see what suggestions would come.  

Hans-Otto Baral, 15-11-2025 18:25

Re : Small species on Cytisus scoparius

What did you see, Marian, a red-brown stain in the medium? I would expect this since the closely related "Patinella" sanguineoatra reacts like this, the so-called ionomidotic reaction.

Enrique Rubio, 15-11-2025 20:30

Re : Small species on Cytisus scoparius

Hi.
My photos aren't ready yet. I'll send them to you tomorrow and I'll also share them here.

Marian Jagers, 15-11-2025 20:54

Re : Small species on Cytisus scoparius

Zotto, the excipulum discolored toward yellow-brown and continued to dissolve, much like the pileipellis of Xerocomus species (Boletaceae) dissolves in KOH. Only a small portion of the excipulum remained visible. I'd never seen such a reaction in ascomycetes before, hence the doubt.

I've now soaked some apothecia and repeated the test. The excipulum discolored slightly (not as strongly as yesterday), and at the beginning only a very fleeting light brown discoloration was visible. Not spectacular or intense.
Does it make any difference to the reaction whether fresh or dried material is used?

Hans-Otto Baral, 16-11-2025 08:35

Re : Small species on Cytisus scoparius

There is no difference in recent and very old material. But don't waste apothecia, Adam will need them. I do not now how Xerocomus behaves. In any case, the reaction must be tested on a slide, either under the bino by placing directly in a drop of KOH, or in a water mount by adding KOH from the side.

Enrique Rubio, 20-11-2025 19:21

Re : Small species on Cytisus scoparius

Hi to everybody.
Here my pics collected by my friend Javi Mateos on branches of Genista florida still attached to the shrub (may 2023, 1000 m of altitude). 
In reality, the apos (up tp 0.6 mm) did not look very 'sanguine'.
The ionomidotic reaction exists, but it was very weak. If anyone needs the photos at higher resolution, please request them from me. I have an ITS sequence that I already sent you. The LSU was invalid and I couldn't use it.

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Hans-Otto Baral, 20-11-2025 19:37

Re : Small species on Cytisus scoparius

Exactly! The species resembles microscopically "Patinella" sanguineoatra and in the sequence.

Enrique Rubio, 20-11-2025 19:43

Re : Small species on Cytisus scoparius

Hi Zotto
Do you know were the protologue of this species is?