Observation 116620: Myelochroa obsessa (Ach.) Elix & Hale
When: 2009-10-27
No herbarium specimen

Notes: HABITAT open forest; SUBSTRATE siliceous rock; ASPECT mostly shaded; NOTES on siliceous rock in hardwood forest; THALLUS v closely appresed, pale grayish, narrow flat shiny lobes with looped axils, v short black cilia in axils, smooth surface, scattered thickish cylindrical to sausage-shaped simple to occasionally forked concolorous isidia, orangish discolorations from off-white medulla occasionally showing through thinnings in cortex, black below to brownish at very edge with abundant simple black rhizines, K+ yellow, C-, KC-; MEDULLA white, K+ yellow turning bright red persisting, C-, KC fading to yellow-orange and persisting.

Images

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20091027-55.jpg
damp
282309
20091027-54.jpg
damp
282310
20091027-89.jpg
Upper side, showing some yellowish medulla, at 30×.
282311
20091027-90.jpg
Isidia, at 30×.
282312
20091027-91.jpg
Underside, at 30×.

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Eye3 = Observer’s choice
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Created: 2012-11-13 16:44:04 PST (-0800)
Last modified: 2012-11-13 16:44:13 PST (-0800)
Viewed: 5 times, last viewed: 2016-10-27 08:31:55 PDT (-0700)
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