Observation 201887: Rhizocarpon obscuratum (Ach.) A. Massal.
When: 2014-10-26
(47.4869° -117.5328° 692m)

Notes: on basalt boulder; steep north-facing cliff with caves and scattered pines and shrubs at foot

thallus pale gray rimose-areolate extensive K- C- KC-, medulla P- I- (Lugols), apothecia black with raised black rim and often an umbo, epihymenium brown clearing in K, exciple red-brown perhaps intensifying in K, hypothecium dark brown K-, hymenium greenish ~110um, spores 8 per ascus halonate hyaline 3-septate to more often submuriform ~16×10um

Images

513497
20141026-173-24.jpg
513498
20141026-173-43.jpg
apothecium section, in water and K, at at 100x
513499
20141026-173-44.jpg
apothecium section, in water and K, at at 400x
513500
20141026-173-45.jpg
spores, in K, at at 400x

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Created: 2015-03-27 01:59:40 GST (+0400)
Last modified: 2015-03-27 01:59:44 GST (+0400)
Viewed: 15 times, last viewed: 2017-06-20 09:11:07 GST (+0400)
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