Observation 63040: Flavoparmelia baltimorensis (Gyelnik & Fóriss) Hale
When: 2003-09-27
No herbarium specimen

Proposed Names

-47% (2)
Recognized by sight: that distinctive ridged surface, isidiate surface
68% (2)
Eyes3
Recognized by sight: Just examined an identical specimen from Vitaly (20100404.43) which turned out to be usnic and black below, but with the exact same isidia and ridged surface. I guess it must be F. baltimorensis because I don’t know any other usnic parmelioid on rocks with this sort of pustulate-isidia (Xanthoparmelia has nice clear “isidioid” isidia). This is a new morph of F. baltimorensis for me, if it is, though.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Canoparmelia
By: Vitaly Charny (vcharny)
2011-02-04 14:57:09 PST (-0800)

I don’t know where from I have two references to this picture Flavoparmelia? and specifically Hipotrachyna osseoalba It was strange for me indeed – so I decided to initiate a discussion so helpfull to my education – thank you!

By: Chris Parrish (kitparrish)
2011-02-03 22:52:34 PST (-0800)

Your photo and Jason’s remarks prompted me to have another look at Hale’s classic paper on what used to be called “Pseudoparmelia.” The North American species are now included in Canoparmelia, Flavoparmelia and Pseudoparmelia. Here is a summary of Hale’s key restricted to the North American species:

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1a. thallus greenish yellow (usnic acid present) … Flavoparmelia

isidiate Flavoparmelia baltimorensis
sorediate Flavoparmelia caperata
NIS Flavoparmelia rutidota

1b. Thallus whitish to greenish mineral gray (usnic acid absent) … Canoparmelia and Pseudoparmelia

isidiate, on trees Canoparmelia (amabilis, amazonica, caroliniana, martinicana, salacinifera)
isidiate, on rocks Canoparmelia (amabilis, caroliniana)
sorediate Canoparmelia (alabamensis, crozalsiana, cryptochlorophaea, texana)
NIS Pseudoparmelia uleana

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Canoparmelia amabilis has coralloid isidia, and a light-colored lower surface.
Canoparmelia caroliniana has cylindrical isidia and a black lower surface with possibly brown margins.

Hale, Mason E., Jr., 1976, A Monograph of the Lichen Genus Pseudoparmelia Lynge (Parmeliaceae), Smithsonian Contributions to Botany 31: 1-62
North American species discussed in Hale’s monograph of Pseudoparmelia are now included in the genera Canoparmelia (alabamensis, amazonica, caroliniana, crozalsiana, cryptochlorophaea, martinicana, salacinifera, texana), Flavoparmelia (baltimorensis, caperata, rutidota), and Pseudoparmelia (uleana [= North American Pseudoparmelia sphaerospora])

Heiman, Karin, and John A. Elix, 1999, A new species of Canoparmelia from North America (lichenized Ascomycotina, Parmeliaceae), Mycotaxon 70: 163-166. Description of Canoparmelia amabilis

This doesn’t look like Hypotrachyna to me
By: Jason Hollinger (jason)
2011-02-03 18:41:28 PST (-0800)

The lobe shape looks wrong, and the ridged texture suggests Canoparmelia instead. Just a guess, though. Hypotrachyna would have long, forked or branched rhizines, generally right to edge and including on the edges. In Canoparmelia the rhizines become very small to disappearing at the edge, and they are short and unbranched throughout. That’s the “official” way to distinguish the two. A closer look at the isidia/pustules/soredia would also help. It looks like this almost has isidia. Parts look like young developing pustules, but notice that even where very well-developed they don’t seem to be breaking up. The cortex seems to remain intact. (Hard to be sure, though.) I was going to say C. crozalsiana, because that’s the classic one with ridged surface like this, but I just saw a photo of C. amabilis which is very close to yours. (Also C. crozalsiana should have soredia, not isidia, my bad.) Chemistry could also help confirm one way or another.

Created: 2011-02-03 17:30:14 PST (-0800)
Last modified: 2015-04-03 17:14:15 PDT (-0700)
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