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Orbilia with fusiform spores
Ethan Crenson,
31-05-2025 00:51
Hello,
Last week in New York City this Orbilia was found on a branch of hardwood resting on the ground. It is rose-orange colored with a smooth margin.
The spores are fusiform with one acute end (the end with the spore body) and one rounded end. They are not curved. The spore bodies are mostly long and vermiform, fairly broad.
Asci are truncate at certain angles. In the photo I have highlighted, the spores are oriented inside the asci so that the top four spores have the spore bodies facing up, while the bottom four have the spore bodies facing down.
Paraphyses are septate, capitate, and encrusted. 2.5-4µm wide at the broad point of the apex.
Here are the measurements:
Spores:
4.5-6.6 x 1.5-2.3µm
Me: 6 x 1.9µm
Me: 6 x 1.9µm
Q: 2.4-4.3
Qe: 3.2
N=13
Qe: 3.2
N=13
Spore body length:
1.6-4.8µm
Asci:
36-42 x 4.1-4.3µm
I am can find in Zottos magnificent monograph that Orbilia fusiformis may be a good match for spore morphology, but I think that would be a very remarkable expansion of distribution.
Thank you in advance!
Ethan
Hans-Otto Baral,
31-05-2025 09:50
Re : Orbilia with fusiform spores
Hi Ethan
I think this is quite a good match! Your spores are broader, but this could be varation. We do not know if the few specimens cited under fusiformis are conspecific or not, I hesitated to merge them in one diagnosis.
Zotto
Ethan Crenson,
31-05-2025 14:28
Re : Orbilia with fusiform spores
Hi Zotto,
Thank you for your comments. I will attempt to sequence this collection and perhaps this will lead to further clarity. QUestion: is it possible that the last photo shows the anamorph, or is that contamination?
Thanks again,
Ethan
Hans-Otto Baral,
31-05-2025 14:54
Re : Orbilia with fusiform spores
I thought of a contamination