Observation 28261: Parmotrema hypotropum (Nyl.) Hale
When: 2009-11-15
No herbarium specimen

Notes: A bluish, flat, smooth-lobed organism that I think is a lichen. Some lobes are not entirely attached to the wood and the underside is jet-black. There are prominent black hairs along the margins and to parts of the underside. Similar to Punctelia rudecta except for the black underside and the hairs. Could this be Flavoparmelia caperata?

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Parmotrema hypotropum
By: Jason Hollinger (jason)
2009-11-17 16:55:53 EST (-0500)

Ruffled lichens like this with cilia are usually Parmotrema. Other genera with cilia either have narrower or smaller lobes, or they are more closely-attached. Yours shows a) soredia (granules along the margin), b) cilia (not all Parmotrema have cilia), c) some white splotches underneath (first photo), and d) smooth surface (I’ve seen P. reticulatum with white splotches, too, but it is minutely cracked all over the upper surface). This is a very diverse genus in the Appalachians and southeast. Thanks to the excellent detail visible in your photos, we can still be fairly confident of its ID!

Created: 2009-11-15 11:12:25 EST (-0500)
Last modified: 2009-11-15 11:12:25 EST (-0500)
Viewed: 79 times, last viewed: 2016-10-21 19:20:47 EDT (-0400)
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