11-10-2024 13:39
Maria PlekkenpolHello, these were on dung of wild horse. Apotheciu
08-10-2024 16:51
Margot en Geert VullingsThese small cup fungi were found on 26 September 2
11-10-2024 11:58
Rajamaki MarttiHi!Just yesterday when I was crawling on the meado
09-10-2024 05:05
Ethan CrensonHello all, I found this tiny pale yellow Hymenosc
10-10-2024 13:31
Thomas LæssøeAsci loosening with long tails; spores biseriate,
09-10-2024 05:41
YI-SIOU CHENHello, I found two species of Brunnipila in Taiwa
08-10-2024 13:44
Pavel JiracekI think this is R.bolaris. How can I verify that a
07-10-2024 05:02
Francisco CalaçaHi there! A long time I dont figure here! How are
08-10-2024 19:45
Margot en Geert VullingsThese bright yellow small discs found on 29 Sep 20
I found this tiny pale yellow Hymenoscyphus on twigs, leaf petioles and leaves of what may have been fraxinus in a wetland area in New York City in the Bronx. The forest was composed of ash, maple, oak and sweet gum.
The apothecia are about 1.5mm tall with a yellow hymenium. The stipe is lighter in younger specmens, but becomes brown in older specimens.
Spores are hyaline, multi-guttulate usually with 2-4 larger guttules and several smaller ones, some curved, many with one blunt end and one acute end. Dimensions:
14.2-21.6 x 3.6-6.0µm
Me: 18.6 x 4.8µm
Q: 2.4-5.3
Qe: 4.0
N=15
Asci, clavate, IKI+, with croziers. Dimensions:
91-112 x 8-12µm
Paraphyses with tiny guttules, cylindrical, about 3µm wide.
Ectal excipulum textura porrecta. Some brown pigmentation in the Ectal.
It is not certain that the substrate is Fraxineus. As far as I know Ash dieback caused by H. fraxineus is not reported from North America. (Unfortunately, I get a overwhelmed with Google results leading me in that direction if I include the possible substrate in my searches).
Any help would be appreciated.
Thanks!
Ethan
Looking at the spores, I wonder whether there are very short (1-2 µm long maxi) cilia at their ends or not ?
Amitiés Michel
I am not sure KOH would help with the observation of cilia . I join your plate with the suspected spore ends with short ones, but not sure. I also join a picture with H. scutula spores with short cilia to compare. But H. scutula has no croziers and it grows on plant stems rather than twigs.
Michel
Amitiés. Michel
Thank you all again for your help.
can you please make a section of the petiole (or rachis), in water? Some other hosts with long petiole (eg. Acer, Q. rubra) can be excluded by its anatomy.
Viktorie