Observation 79405: Toxicodendron diversilobum

When: 2011-09-15

Collection location: Bouverie Preserve, Glen Ellen, Sonoma Co., California, USA [Click for map]

Who: Jeanne (jeanne@egret.org)

No specimen available

This thread-like organism appeared on the stems on a single bush of poison oak in August (possibly earlier). It is growing directly out of the stem. At the base of each thread-like projection there is a little bump. The threads are grouped together in patches that occur on several branches. It is the color of a cock’s comb and is fleshy like a moist Phlogiotus. I don’t even know if it’s a fungus but I haven’t had any luck looking at potential diseases or insect-caused growths. Any ideas?

The photo shows what it looked like in mid September. It is starting to dry out now.



Proposed Names

24% (2)
Recognized by sight: I agree with you, Martin. Poison oak forms aerial suckers; these must be them at a young age.
93% (3)
Recognized by sight: from what i understand, radicans is poison ivy, diversilobum is our local poison oak

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
you are correct, Sir…
By: Debbie Viess (amanitarita)
2011-10-13 13:35:50 EDT (-0400)

I am no botanist! ;)

nice find, even if a plant…
By: Debbie Viess (amanitarita)
2011-10-12 21:44:50 EDT (-0400)

I have never seen this stage of poison oak.

If poison oak is like poison ivy
By: Martin Livezey (MLivezey)
2011-10-12 20:10:30 EDT (-0400)

I would say those are roots! probably not fungi…,

Created: 2011-10-12 20:05:22 EDT (-0400)
Last modified: 2011-10-13 15:18:57 EDT (-0400)
Viewed: 160 times, last viewed: 2018-09-06 12:03:38 EDT (-0400)
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