Observation 168071: Rhizocarpon cinereovirens (Müll. Arg.) Vainio

Images

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Copyright © 2015 Jason Hollinger (jason)
Close-up of apothecia and thin, continuous to rimose thallus.
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Copyright © 2007 Jason Hollinger (jason)
Apothecial section in water and KOH.
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Copyright © 2007 Jason Hollinger (jason)
Two apothecial sections in water, the right one thicker, sshowing the dark hypothecium better.
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Copyright © 2007 Jason Hollinger (jason)
Halonate young spores, in water and K/I.
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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)
Eye3 Eyes3
Used references: Identified by Alan Fryday

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

Add Comment
Thanks, good point
By: Jason Hollinger (jason)
2017-03-17 02:01:12 WIB (+0700)

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 22:05:24 WIB (+0700)

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)
2017-03-16 03:57:21 WIB (+0700)

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.

confirmation
By: Jim Bennett (Lichenman)
2017-03-16 01:14:39 WIB (+0700)

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)
2017-02-16 01:10:45 WIB (+0700)

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

Jim Bennett thinks it’s var. arcuatula.
By: Andrew Khitsun (Andrew)
2014-06-22 10:58:58 WIB (+0700)

But he did send a specimen to Fryday

Created: 2014-06-22 10:46:56 WIB (+0700)
Last modified: 2017-03-16 09:26:36 WIB (+0700)
Viewed: 91 times, last viewed: 2017-12-11 05:36:45 WIB (+0700)
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