Observation 91242: Pertusaria coccodes (Ach.) Nyl.
When: 2012-03-29
Herbarium specimen reported

Notes: on horizontal trunk of living Pseudotsuga menziesii which extends out over beach

isidia ca. 0.125mm diameter, variable length with most quite short but some longer and a few branch

K+moderate yellow (Brodo says K-), will check UV when next at herbarium

update – K+yellow with formation of acicular reddish crystals, C-, KC-, UV-

Proposed Names

-45% (2)
Used references: Goward, Trevor (1999) The Lichens of British Columbia, Illustrated Keys, Part 2 – Fruticose Species, Brodo, Irwin M., Sharnoff, Sylvia Duran and Sharnoff, Stephen (2001) Lichens of North America, added references Smith, C.w., Aptroot, A., Coppins, B.J., Fletcher, A., Gilbert, O.L., James, P.W. and Wolseley, P.A. (2009) The Lichens of Great Britain and Ireland, and Bruce McCune’s Miscellaneous Keys to Microlichens of the Pacific Northwest of North America

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Well done!
By: Jason Hollinger (jason)
2012-04-23 17:00:25 AEST (+1000)

I see it in the British Flora. Does McCune have a key for Pertusaria somewhere, too? I’ve never heard of this species. Exciting.

Pertusaria coccodes
By: Richard Droker (wanderflechten)
2012-04-23 15:18:53 AEST (+1000)

Don’t know why I didn’t consider this species, as it really seems to fit well, and although rare is known from the west coast of North America. When I viewed sections of thallus and isidia in KOH the crystals (see new photos), the potassium salt of norstictic acid, led to P. coccodes.

I updated the observation information (chemical tests, references) above.

C/KC soon
By: Richard Droker (wanderflechten)
2012-04-06 04:59:20 AEST (+1000)

Thanks Jason. I intend to get some fresh C and proceed from there.

Did you do C / KC tests, too?
By: Jason Hollinger (jason)
2012-04-05 04:29:03 AEST (+1000)

J. Lendemer’s working key to North American sterile crusts doesn’t suggest anything. C. Björk’s key to BC’s epiphytic sterile crusts also fails. British Flora gives several options:

Ochrolechia subviridis – gyrophoric acid
Pertusaria corallina – thamnolic acid
Pertusaria coronata – stictic acid
Porina rosei / Porina hibernicaTrentepohlia, K- though?

Sonoran Flora vol. III suggests Ochrolechia subisidiata (lecanoric acid).

None of these work for me. I assume you’ve double-checked your spot tests. It would seem to leave only three options: this is an undescribed species(!), it’s a new record in N. Amer.(?), or this is just an unusual chemical race of Loxosporopsis corallifera.

UV negetive
By: Richard Droker (wanderflechten)
2012-04-04 23:55:13 AEST (+1000)

Well, I really expected it to be positive. Disappointed its not Loxoporopsis, but interesting to try and figure out what it is. So for now – I’d call it Lichen species.

Sure, I think it’s “promising”
By: Jason Hollinger (jason)
2012-04-03 04:18:28 AEST (+1000)

Believe me, there are a lot more uncertain observations with the same level of confidence! For whatever it’s worth (since there is no official guidelines for voting!), I use the vote levels like this:

“could be” means it is plausible, but there are other possibilities which I cannot distinguish with the information given

“promising” means the evidence fits and I can’t suggest any equal or better alternatives (a spot test being subtly off doesn’t disqualify this level of confidence in my opinion, they are so easy to misread, and odd chemotypes occur in most species at least rarely)

“I’d call it that” means there is enough evidence to confirm the id and I feel confident I could defend my position to a professional

There really should be another level, say “verified by expert”, that can be used when an expert confirms the ID, for example. There are a lot of things I thought I knew which I gave “I’d call it that” votes, but I later learned that I’d misinterpreted. It would be nice to separate out those observations which are known absolutely to be correct. It’s so important to have at least a few rock solid data points. Kind of like being able to examine the type specimen.

By: Richard Droker (wanderflechten)
2012-04-03 03:12:09 AEST (+1000)

Don’t know if your confidence in my identification is warranted yet. Perhaps a UV- will help.

(I’ll send you a photo of McCune’s which resembles this specimen.)

Regarding classification:

ndex Fingorum (and some other taxonomy sites) classifies Loxosporopsis in family Pertusariaceae.

Brodo (p. 752) has it in Ophioparmaceae with question mark – “Loxosporopsis?”, along with “Loxospora?”

(Smith et al. has Loxospora in Sarrameanaceae, under “families incertae sedis in the subclass Ostropomycetidae”. Some others have it in Loxosporaceae.)

You make a convincing case!
By: Jason Hollinger (jason)
2012-04-02 15:08:15 AEST (+1000)

The least I can do to help is fix the name. Will be interesting to see how the UV turns out.

In any case, it’s good to have another observation of this species. Aside from that pesky guy Sharnoff’s photo, there’s very scarce on-line documentation of this lovely species. I didn’t know this was in the _Pertusariaceae.

Will look forward to the other observations!

hard to summarize – you’ll have to read it all
By: Richard Droker (wanderflechten)
2012-04-02 11:55:39 AEST (+1000)

Actually I did think hard about Pertusaria and became pretty sure about this being Loxosporopsis. I have not been able to look at Brodo and Henssen (1995). McCune’s “Key to the Lichen Genera of the Pacific Northwest” has the isidia of L. corallifera less than 0.2mm diameter (this specimen’s are 0.125) and Pertusaria greater than 0.2mm diameter. However, now I see in Nash, T.H., Ryan, B.D., Gries, C., Bugartz, F., (eds.) 2001. Lichen Flora of the Greater Sonoran Desert Region. Vol 1. the isidia of P. pseudocorallina 0.12 – 0.24mm diameter. Nowhere do find its substrate listed as other than rock though. Certainly the isidia of this specimen are mostly very short for L. corallifera. On Tuesday I’ll try UV which should be positive for L. corallifera and negative for P. pseudocorallina. There was quite a lot of this on the Doug Fir trunk, so next time I’m up that way I’ll look at the rest of it.

(I do have a typical specimen and slides of L. corallifera with long isidia from Tahuya State Forest, Washington, lost somewhere in the swamp.)

(I’m reminded of the Pertusaria corallifera in Iceland for which I will create an observation.

Its a monotypic genus in the Pertusariaceae.I entered this observation as Loxosporopsis corallifera, but for some reason it came up as L. sp., and for some reason I was not and have not been able to edit it (including adding to word isidia to ca. 0.125 diameter).

K+y is odd, you’re right
By: Jason Hollinger (jason)
2012-03-30 09:56:50 AEST (+1000)

Is there more than one species of Loxosporopsis, or is it just L. corallifera? Could this be a Pertusaria instead?

Created: 2012-03-30 09:38:32 AEST (+1000)
Last modified: 2012-04-23 16:58:51 AEST (+1000)
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