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
Podospora excentrica
Chris Yeates,
08-10-2021 17:19
Bonjour tous
A recent collection of dung from mountain hare Lepus timidus was seen to have a perithecium of this species even before incubation commenced. Examination with Nomarski DIC gave an opportunity to look for the gelatinous appendages normally invisible without indian ink (which was later used to double-check the identification). The perithecium only contained asci at various stages of immaturity, some old collapsed spores and numerous fully mature ones no longer in their asci.
So these images show the latter, as well as a couple of submature spores which show the asymmetry well. I thought fellow copromycologists might be interested. As you can see with DIC the apical appendage shows quite well as a sort of gel sheath, with a definite margin - hard to see in indian ink mounts which are of necessity more diffuse. I was not able to distinguish the basal appendages with this technique, perhaps because the spores were not fresh out of the asci.
Another feature I noticed - though forgot to photograph - was that the pedicels were consistently of a distinctive shape. Unlike the simply rounded club-like pedicels one generally sees in Podospora these had a rather "pinched out" apex, a little like a teat.
Amitiés, Chris
Michel Delpont,
08-10-2021 18:45
Re : Podospora excentrica
Bonsoir Chris!
Indeed the shape of the spores and their pedicels of your harvest make one think of exentrica. Have you been able to observe the hairs at the top of the perithecium and measure the size of the spores?
Amitiés.
Michel.
Chris Yeates,
08-10-2021 19:26
Re : Podospora excentrica
Bonsoir Michel
Yes tufts of hairs like these, and some much longer, spore size 33.2-38 x 18.2-20.5µm. Appendages also checked in indian ink.
Amitiés, Chris
Michel Delpont,
08-10-2021 20:15
Re : Podospora excentrica
The size of the spores is in the upper range (especially the width), the hairs as well as the slightly exentricated germ pore lead to P.exentrica.
Michel.
Chris Yeates,
08-10-2021 20:36
Re : Podospora excentrica
Thanks
Lundqvist in Nordic Sordariaceae gives much wider spore measurements (18-24µm). I've noticed on other occasions that his measurements can differ from other authors. Doveri gives a Qe of 1.89, mine was 1.9; so yes I'm happy with the identification.
Chris
Norbert Heine,
08-10-2021 23:12
Re : Podospora excentrica
Great Found, Chris!
In my opinion this is a rare species. You should compare with this nice documentation.
Norbert