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on Casuarina from the Bahamas

Ethan Crenson, 01-02-2023 16:57

Hi all,
On a recent visit to the Bahamas, I had a layover at the airport at Nassau where I found these interesting hysterothecia growing on needles of Casuarina. They are quite small, barely reaching .5mm at the longest. Thin walled, elongated, black with a slit along the apex.

Asci subglobose, bitunicate with nipple shaped protuberance of ascus contents at the apex. 20.5-24.2 x 12.6-13.9µm

Spores are hyaline didymospores– 1-septate, constricted at the septa, upper cell larger than lower, rounded ends, one oil droplet for each cell. 8-10.3 x 3.7-5µm.

Can anyone help me identify it? Many thanks in advance.

Ethan

Ethan Crenson, 02-02-2023 16:15

Re : on Casuarina from the Bahamas

Hi again,

I discovered a thread in the forum that seems quite helpful in my particular case:

http://www.ascofrance.fr/search_forum/28343

I believe Asterinaceae might be a good place to look. Melaspileaceae is discussed in the above post, but I don't believe my collection is lichenized, as it is on a needle and there is no thallus present that I can detect.

I guess my previous characterization of the fruiting bodies as hysterothecia is technically incorrect and thyrothecia is more accurate. I hydrated the collection to see if they would open at the slit. They did not.

The asci in Lugol's solution are inamyloid. I'm adding photos here. I failed to see asci after pre-treatment in KOH, unfortunately. I will try again.

Genera I have flagged so far are: Morenoina?
Aulographum?
Echidnodes?

Finally, in my mount in IKI after pre-treatment the spores were brown (see final photo).

Thanks for looking,

Ethan

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