Observation 62112: Exidiopsis effusa Bref.
When: 2011-01-11
No herbarium specimen

Notes: Possible hericium- but have no clue at this point- this is “fruiting” everywhere in hardwood canopies. Acer macrophylum and Alnus Rubra. Anyone know?

UPDATED 7/16/2015: Called “Hair Ice” apparently and is uncommon.


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Thanks Dan and Danny!
By: Drew Henderson (Hendre17)
2015-07-19 11:58:43 EDT (-0400)

I always felt that something fungal must be at work here when I have come across this phenomenon in small sticks and branches(usually between January and April when temps flux). Thanks for all the help and info. Thanks to Gall Alain for knowing for sure “what this is not.”

I have had gas exchanges in slant media and test tubes that have pushed out whatever I am cloning to the top of the slant with great force within first few weeks of inoculation. Same behavior perhaps- but temp initiated, rather than chemical in exchange.


Spores truly,


Frost flowers
By: Dan Molter (shroomydan)
2015-07-17 20:36:13 EDT (-0400)

“Frost flowers or Hair Ice.”http://www.decodedscience.com/...

There is an interesting fungal relation. From the linked article:

“In studies of hair ice formation on beech wood, it appears that the presence of fungi in the wood also helps push the ice through those little pores. Some fungi are active in logs in the winter time. These fungi produce carbon dioxide and water as products of their activity, and the carbon dioxide helps push water out through the pores in the wood. Beech logs treated with antifungal agents do not produce as much hair ice.”

By: Danny Newman (myxomop)
2015-07-17 18:08:28 EDT (-0400)

the observation you linked to is in no way whatsoever the same thing.

By: Sarah Prentice
2015-07-16 19:31:03 EDT (-0400)

Frost beard!

Beautiful obs. and doc. Thank you Hendre.
2015-07-16 18:45:25 EDT (-0400)

See also comments with links on, http://mushroomobserver.org/200190?q=2c1Xa.
Can you group all these obs and doc, under a same new name ????

also seen here:
By: Danny Newman (myxomop)
2013-04-25 17:04:17 EDT (-0400)
this is neat!
By: Britney Ramsey (Riverdweller)
2011-01-12 07:10:44 EST (-0500)

and whether it’s ice or mycelium, either way is an awesome find!

Looks like ice
By: Irene Andersson (irenea)
2011-01-12 02:41:57 EST (-0500)

There’s a name for this phenomenon, but I have forgotten it. Under certain weather conditions and temperatures, dead wood can press out ice as thin threads. Beautiful creations anyway!

Follow it
By: Darvin DeShazer (darv)
2011-01-11 21:45:43 EST (-0500)

Can you keep an eye on it and get more photos as it matures?

By: Jonathan M
2011-01-11 21:38:09 EST (-0500)

Created: 2011-01-11 21:19:34 EST (-0500)
Last modified: 2015-11-12 13:51:58 EST (-0500)
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