30-04-2024 16:22
François BartholomeeusenDear forum members,On April 25 2024, I found one f
01-05-2024 23:22
Ethan CrensonHi all, Found late last week in a New York City p
29-04-2024 21:32
Robin IsakssonHi! Found in Sweden. Ascomata with haris, se
01-05-2024 12:54
F. JAVIER BALDA JAUREGUIHello, everyone.An idea for this pyreno, I found u
30-04-2024 19:43
Gernot FriebesHi!We observed this hyphomycete growing between le
29-04-2024 21:51
Mathias HassHi everyone, Found on attached branches of top pa
28-04-2024 18:05
Bernard CLESSEBonsoir à toutes et tous,J'ai trouvé ce matin ce
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