What's that chlorine smell in the woods? (Shallow Thoughts)

Akkana's Musings on Open Source, Science, and Nature.

Sat, 29 Jul 2006

What's that chlorine smell in the woods?

A few weeks ago, hiking in the woods, I noticed it was happening again: the smell of chlorine in a forest far away from pools or other likely sources of chlorine smell. This happened about this time last summer, too. It only lasts for a few weeks: apparently there's something that blooms briefly in deep redwood forests which smells like pool chlorine.

Whatever it is, it's pervasive and not very localized. I never notice it getting stronger near any of the trails where we hike -- it's more a general odor one notices while driving along forest roads. That makes it hard to narrow it down to a specific plant.

Googling wasn't entirely enlightening, but it did suggest that the most likely culprit is a mushroom. Various species of Mycena mushrooms apparently emit a chlorine-like odor, especially when they're growing on wood. Chlorine smells are also reported from Marasmius oreades, the "fairy ring" or "scotch bonnet" mushroom, and from Amanita chlorinosma and A. polypyramis. But I didn't find anything about widespread seasonal blooms of any of these mushrooms.

So the mystery remains, and I guess all that's left is to remember, when hiking in the redwood forest at this time of year, to stop and smell the mushrooms.

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[ 10:36 Jul 29, 2006    More nature | permalink to this entry ]