24-10-2025 03:11
Francois Guay
I found this fungus growing on decaying conifer wo
23-10-2025 20:59
Patrice TANCHAUDBonsoir, est-ce que quelqu'un posséderait un com
20-10-2025 09:36
Nicolas VAN VOOREN
Hello.I'm searching for the following article:Bene
21-10-2025 23:13
F. JAVIER BALDA JAUREGUIHello to everyone.Did you think it could, be a pyx
22-10-2025 14:45
Lukas VerboomDear all,I collected this in the Netherlands, on t
22-10-2025 11:13
Jean-Luc RangerBonjour, Petites boules plus ou moins sphériqu
21-10-2025 21:25
Philippe PELLICIERBonjour,J'ai récolté en septembre sur une litiè
17-10-2025 18:45
Riet van Oosten
Hello, Found by Laurens van der Linde, Oct. 2025.
Asci with 8 spores each; The spores are 1-septate when young and then develop other septa, up to 8-septate.
Asci: up to 215 x 12 um;
Spores:
(26.7) 29.2 - 33.7 (34.5) x (6.2) 6.5 - 7.9 (8.1) µm
Q = (3.9) 4 - 4.76 (4.8) ; N = 20
Me = 31.2 x 7.2 µm ; Qe = 4.4,
I will appreciate any hint for the classification.
Thanks in advance,
zaca
In fact, I thought this was a lichen, but I found no trace of an alga.
The last two sets of photos (except for the one on the left hand of the last) were taken after join a drop of melzer to the slide. This permits to see clearly the septation of the spores, which was not possible without it.
Thanks again,
zaca
It is well possible that the asci are inamyloid. Anyhow I would try Lugol for a possible hemiamyloid reaction.
The spores ar very characteristic, I think a lichenologist knows them.
I will follow your suggestions and try a new preparation, whenever possible. If I'll find anything different, it will be reported here.
Thanks,
zaca
Hi Zaca,
Like Zotto, I think it could be a lichen, with leprose thallus.
You can test chemical reactions on the thallus : K, P, C, KC.
How are ascomatas ? Perithecias ? Apothecias ?
Alain
The ascomata are perithecia. I made the spot tests and all chemical reactions were negative. Moreover, did new microscopic observation and found that there seems to be a brown or golden-green alga (perhaps of the genus Trentepohlia). I checked the reference mentioned below and, taking into account the microscopic data, found two genera of pyrenocarpous to which my specimen can belong: Porina or Strigula. I found, in particular, a species _Strigula stigmatella_ with similar features.
Many Thanks to Zotto and to Alain, for their comments that lead me to the possible solution,
zaca
Ref:
Alan Orange, British and Other Pyrenocarpous Lichens, 2013.
(available at: https://www.museumwales.ac.uk/media/13849/Orange,-A.-(2013)-British-and-other-pyrenocarpous-lichens.pdf)