21-11-2025 10:56
Christopher Engelhardt
Very small (~0,5 mm) white ascos, found yesterday
21-11-2025 11:52
Jean-Luc RangerBonjour à tous, on voit toujours 2 espèces areni
14-11-2025 16:26
Marian Jagers
Hello everyone, On dead wood of Cytisus scoparius
17-11-2025 21:46
Philippe PELLICIERBonjour,Récolté sur bois pourrissant de feuillu
20-11-2025 14:14
Mick PeerdemanFound on the leaves of 'Juglans regia' in the Neth
20-11-2025 13:07
Mick PeerdemanIn January i found these black markings on the dea
on my last field trip I found a few ascos which I cannot determine without your help. The first one is a Hilberina with brown ascospores (already inside the ascus) which measure about 35-42 x 3,5-4,5(5,5) µm and have mostly one septum, rarely two (three could be possible given the pattern of septation but I never observed more than two septa). Ascospore morphology seems to deviate from most of the known species in this genus...
It grows on the bast of a Fagus branch that was collected from the ground.
Help is very much appreciated!
Best wishes,
Gernot
Andy
I had initially excluded H. breviseta because Hilber & Hilber (http://www.landesmuseum.at/pdf_frei_remote/Sydowia_36_0105-0117.pdf) describe and illustrate the ascospores with more attenuate basal parts (also overall a bit longer). Maybe this is not always the case? Other than that it seems to fit decently well.
Hilberina caudata I thought should have more sharply curved basal ends so I had excluded that one as well. Really not an easy group this...
Best wishes,
Gernot
I am a lumper, not a spliter - what can I say?
Andy
H. breviseta has spores with an acerose basal end, so it should be exluded here. Otherwise H. caudata has much longer and wider spores compared to your collection and should excluded too.
Into my opinion your collection should be situated close to H. moseri, a species I never collected however and is said ot have slightly longer spores. Sequencing would be helpful here.
Best regards,
Bernard
Hi friends,
Good guess from Bernard ! I know a little this species for having collected more than 6 times I'm at present time working on Lasiosphaeria moseri, by a strange and incredible coincidence. The mine on Buxus, as usual.
See photos of ascospores, one can observe an intraspecifical variability in shape and size of ascospores.
Alain
Andy
Hi Andy,
I look at material. If it's good, mature and sufficient, I send it to you. If not, I think I can to find more next week.
Alain
Only Andy can solve this mess!
Jacques
Andy
Best wishes,
Gernot
Me too, not enough material, as it's often with such species, but I've a good hope to find it again.
Alain