Observation 175658: Armillaria (Fr.) Staude

Foxfire was very widespread on the forest floor near home on Monday night after a heavy rain on Saturday. By Tuesday night after a very warm sunny day, 95% was gone. Here is one photo taken at 3 am of wood fibers on the top of a rotting log when it was too dark to focus. 30 sec. exposure with f2.0, 60mm lens

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Get the log wet
By: Dulce (Monteverde Wild Hikes)
2015-06-19 13:10:46 PDT (-0700)

I am trying to figure out what kind of bioluminescent fungus we have here at Ficus Trails, Monteverde, Costa Rica. What I do know is that if you get the log or whatever decomposing material the fungus is growing on totally wet, it will continue to glow. I found an old log that has been decomposing for a while. I found it in June last year and last night it was as pretty as ever because it is rainy season. There’s a chemical reaction that makes water be the key to its glowing.
Let me know if it works for you as it does for us. We always carry water during summer when leading the Night Guided Walks and after you get it wet it will take a minute or two and it starts glowing again.