This was growing out of the end of a cut Umbellularia californica log.
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The major differences between Stemonitis and Symphytocarpus is that the latter has peridia or outer skin that are usually persistent and covers the top of the sporocarps. There are a couple Stemonitis that also have peridia but those are are not persistent and usually only patches remain. The second difference from what I have observed is the Hypothallus or skin that the sporocarps grow from. The specimens I have seen have a long Hypothallus and looks like it slides down the surface of the substrate creating a shiny film above the sporocarps. That is visible in this and all of my observation of Symphytocarpus. Those observations are of specimens that have formed on the side of the substrate and that could be biased but none of the Stemonitis I have seen have this attribute not even the ones that have formed on the side of the substrate.
The species you are talking about have been moved to Stemonaria:
Created: 2015-03-08 00:34:03 EST (-0500)
Last modified: 2015-03-24 22:17:49 EDT (-0400)
Viewed: 111 times, last viewed: 2017-11-17 18:46:25 EST (-0500)