13-09-2025 14:01
Thomas Flammerdark brown apothecia, splitIKI-Spores biguttulate
13-09-2025 14:10
Wim de GrootWe found this hymenoscyphus on rubus fruticulosis.
11-09-2025 16:57
Jason Karakehian
Our revision of Marthamycetales (Leotiomycetes) is
10-09-2025 23:53
Marcel Heyligen
Found on Robinia pseudoacasia together with Diapor
10-09-2025 17:18
Blasco Rafael
Hola, encontre este estiercol de vaca estos apotec
02-09-2025 11:34
Thomas Læssøehttps://svampe.databasen.org/observations/10527903
Hypoxylon macrocarpum or similar?
Garrett Taylor,
22-03-2020 01:59
I found this in New York State. On Acer.Spore measurements:
(10.5) 11.5 - 13.4 (15.2) × (5.4) 5.8 - 6.5 (6.6) µm
Q = (1.7) 1.8 - 2.3 (2.8) ; N = 26
Me = 12.4 × 6.1 µm ; Qe = 2
Germ slits the length of spore.
Didn't see any blueing with Melzer's, but there weren't lots of mature asci.
Green pigment in KOH.
I don't believe I have a very good reference for these, all I really have is Wergen 2018 and it doesn't seem to be in there.
A few more images here:
https://www.inaturalist.org/observations/40215428
Jacques Fournier,
22-03-2020 18:30
Re : Hypoxylon macrocarpum or similar?
Dear Garrett,
your Hypoxylon does'nt look like macrocarpum, I would rather look around H. fuscopurpureum., whiich is characterized by pyriform dark brown ascospores with a perispore not dehiscing in KOH. I could not see the images through your link.
To study Hypoxylon, I suggest you go to this website where all important features to record are listed, something to do before using the keys.
Can you please show us the spores?
Best,
Jacques
Garrett Taylor,
23-03-2020 01:28
Re : Hypoxylon macrocarpum or similar?
Hope you can see these well enough. My micro camera isn't the best, the contrast is poor, but you can sort of make out the germ slit on the lower spore in the right-hand ascus. Thanks for the link. I will need to work on understanding some of these concepts.
Jacques Fournier,
23-03-2020 12:22
Re : Hypoxylon macrocarpum or similar?
Hi Garrett,
the blackish heteropolar ascospores fit well H. fuscopurpureum, you can assign this name to your fungus. Only the apical ring deviates if it does not turn blue with iodine. It is easier to make out on immature asci.
Nice find, to my knowledge this species is rarely recorded.
Best,
Jacques
Garrett Taylor,
23-03-2020 20:45
Re : Hypoxylon macrocarpum or similar?
Thank you again, and thanks for sharing the website!
Garrett Taylor,
23-03-2020 20:45
Re : Hypoxylon macrocarpum or similar?
Thank you again, and thanks for sharing the website!