Hi, this species could either be
Mycena pseudocorticola (http://www.flickr.com/photos/21665478@N08/4207946743/)
or Mycena interrupta
(http://steveaxford.smugmug.com/Fungi-the-recyclers/Mycena/i-vfGcJrz).
I think, based on your description and photos, it's the first one. Great catch! Cheers!
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