Copyright © 2015 Jason Hollinger (jason)
Close-up of apothecia and thin, continuous to rimose thallus.
Copyright © 2007 Jason Hollinger (jason)
Apothecial section in water and KOH.
Copyright © 2007 Jason Hollinger (jason)
Two apothecial sections in water, the right one thicker, sshowing the dark hypothecium better.
Copyright © 2007 Jason Hollinger (jason)
Halonate young spores, in water and K/I.
Copyright © 2007 Jason Hollinger (jason)
Ascus stains (in K/I).

Proposed Names

-29% (1)
Used references: Identified by Jim Bennett
45% (2)
Used references: ID provided by Jason Hollinger
89% (2)
Used references: Identified by Alan Fryday

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= Observer’s choice
= Current consensus


Add Comment
Thanks, good point
By: Jason Hollinger (jason)
2017-03-16 15:01:12 CDT (-0400)

Makes sense that a smooth hard rock would encourage thinner thalli. I see that in Aspicilia out west, too.

more info
By: Jim Bennett (Lichenman)
2017-03-16 11:05:24 CDT (-0400)

I don’t think Fryday based his determination on the thallus. His annotation slip for one of the 3 specimens says “spores hyaline, 1(-3) septate, c 20×10 u, norstictic acid”.
Also these specimens are growing on very hard, smooth quarzite, which may make the thallus less bullate than usual. Thomson describes the thallus as moderately thick, aerolate-verrucose, which these don’t seem to be.

Good to have a reference for this species
By: Jason Hollinger (jason)
2017-03-15 16:57:21 CDT (-0400)

British Flora calls the thallus “cracked-areolate to bullate-areolate”. Good to know that in this species that can stretch to almost rimose-continuous. There are only a few photos on the Stridvalls’ site, all showing bullate specimens. Good to have this other extreme shown on-line, too.

By: Jim Bennett (Lichenman)
2017-03-15 14:14:39 CDT (-0400)

I finally got around to sending this specimen and 2 others to Alan Fryday, thinking they were odd Fuscideas. But I was wrong. Alan confirms all are Rhizocarpon cinereovirens.

This is where I meant to post the photos, sorry!
By: Jason Hollinger (jason)
2017-02-15 13:10:45 CST (-0500)

Note the (very) halonate, 1-septate spores.

Jim Bennett thinks it’s var. arcuatula.
By: Andrew Khitsun (Andrew)
2014-06-21 23:58:58 CDT (-0400)

But he did send a specimen to Fryday

Created: 2014-06-21 23:46:56 CDT (-0400)
Last modified: 2017-03-15 22:26:36 CDT (-0400)
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