I forgot to add the dimensions of the spores, what I do now:
(17.9) 18.6 - 21.07 (21.1) × (11.1) 11.2 - 13.6 (13.7) µm
Q = (1.5) 1.52 - 1.7 ; N = 20
Me = 19.8 × 12.3 µm ; Qe = 1.6

Hello, Zaca,
try any key to this genus, for example: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5832953/
Regards,
Marek

Dear Marek,
thanks for your suggestion and link.

However, I have a problem while trying to appy the key, as follows:
I think that is easy to reach the point 54 of the key; For clearliness I repeat the steps below. After that there are only a few taxa remaining:
H. bicolor, H. fistulosa, H. levis, H. monachella,
none of which can be selected as direct application of the key, in my opinion. The one which "seems" closer (looking at photos available in the internet) is H. monachella, but the spores of are much bigger than those of my specimen. So, what to do?

Can anyone help?
Thanks, zaca

Evolution in the key:
1. Apothecium with a ± prominent distinct stipe. . . . . . . . . . . . . . . . . . . . . . . . 2
2. Stipe terete, even, internally solid or hollow, occasionally with
grooves at base and/or apex, tissues well differentiated. . . . . . . . . . . . . . . . . . 30
30. Apothecium convex, bi- to trilobate saddle-shaped, or irregularly lobed. . . .  43
43. Cap saddle-shaped or irregularly lobed with a ± deflexed margin. . . . . . . . . 50
50. Receptacle surface glabrous. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

I'm sorry, I've never seen any of the species you named. But I have experienced that H. atra, according to various sources, can have a stipe only with a shallow dent or blunt ribs. That's all I can say about it. Regards, Marek.

Thanks, Marek, for your collaboration.
Regards,
zaca

Hi Zaca
I think Marek is right and it could be an ascomata of a slightly unusual H. atra. Often, such ones grow together with more typical ones ... below I present one of my collections.
greetings
Mirek

Yeah, thanks. Mirek,
for giving me your opinion.
Looking back to the starting point, from the title of the topic, that was my understanding, but then I decided to question to get more confidence and this now happen.
Regards from Portugal,
zaca

Thanks, Peter,
for increasing the percentage level of confidence. That's always nice to hearing from you and seeing some of your inexhaustible stock of beautiful photos.
Kind regards,
zaca

P.S.: Maybe, I became confused by the trilobed cap.

A beautiful but difficult topic, the more so as not all collections correspond to the descriptions of a given genre.
Quote:
"Apothecia stipitate-capitate, saddle-shaped or irregularly lobed,
1–4 cm broad, 3–12 cm high, cap margin adnate and attached
to stipe at 3–4 points; hymenium and stipe blackish with a dark
violet brown tinge (10-12F-H7-8), even or wrinkled; receptacle
surface greyish brown to black, smooth, with inconspicuous
ribs on outer surface; stipe 0.5–2.5 cm broad, naked, with 4–7
sharp-edged, partly double-edged ribs, attached at 3–4 points
to the reflexed apothecial margin greyish brown to black, paler
towards base, ribs prominent, sharp, partly anastomosing and
double-edged, with 'holes' (lacunae) between ribs, stipe chambered
inside. "



Mirek