17-01-2026 19:35
Arnold BüschlenHallo, ich suche zu Cosmospora aurantiicola Lite
15-01-2026 15:55
Lothar Krieglsteiner
this one is especially interesting for me because
16-01-2026 00:45
Ethan CrensonHi all, On decorticated hardwood from a New York
18-01-2026 12:24
Josep Torres
Hello.An anamorph located on the surface of a thin
08-12-2025 17:37
Lothar Krieglsteiner
20.6.25, on branch of Abies infected and thickened
10-01-2026 20:00
Tom SchrierHi all,We found picnidia on Protoparmeliopsis mur
I would like to have more opinions about this asco, that was growing on the thallus of a lichen (of the genus Graphis), as can be observed from the first photo attached. In addition there was another parasite with similar appearance over the lichen. I was doing the microscopy of the lichen and noticed some stranges spores. Then I selected a emerging volcano and made some sections of it. From the shape of the ascospores I immediatly thought that could be a Hysterium sp.. When I measured the spores I got a surprise, the size was about the double than expected (in average 52.4 x 12.8 µm). I went to the key of Eric Boehm, available at
http://www.eboehm.com/hysterium.html
and arrived to Hysterium macrosporum. Since till now I found only two Hysterium species: H. angustatum and H. pulicarea and, according to the description given in the above website, H. macrosporum it is a very rare species, I became doubtful. Is there any other suggestion?
Thank you in advance,
zaca
Hi Zaca,
H. macrosporum is not possible because ascospores are 2-coloured.
It's close to H. pulicare but different, to my mind. But there are a big variations in H. pulicare (for example, H. pulicare Pers. and H. truncatulum, one of its synonyme) and study would be necessary.
My opinion is that your fungus is probably an ined. fungus.
Alain
PS just a question : ascopores are in water in fourth picture ?
Ragarding your question the answer is: YES. All the observation was done with water.
Regards,
zaca