Observation 94549: Caloplaca citrina group
When: 2012-05-12
Herbarium specimen reported

Notes: I’m thinking of trying to become familiar with Caloplaca, particularly associated with salt water and work on some specimens that have accumulated. Already in trouble with this one. Perhaps I’m missing something. Suggestions would be appreciated.

on driftwood

thallus appears as rimose areolate (ca. 0.5mm thick, white medulla) completely covered by soredia of which masses of extend beyond apparent margins of areoles. There also seem to be some scattered incipient areoles, ca. 0.2mm without soredia, and scattered soredia not associated with areoles.

McCune 2011 pacific northwest key most relevant – keys to C phlogina (also mentions substrates include driftwood); refers to Wetmore 2004 whose key doesn’t include C phlogina, but says “…it appears that the true C. citrina should be restricted to those on saxicolous substrates and other names found for the corticolous material. … Of the corticolous collections, there are ones that are completely diffuse sorediate without areoles and there are others with distinct soralia and areoles. One of these may be C. Phlogina…” However in 2007 (in Nash III, T.H., Gries, C. and Bungartzk, F. (ads) (2007) Lichen Flora of the Greater Sonoran Desert Region, Volume 3) Wetmore includes wood and bark as substrates for C. citrina, and C. phlogina is listed as a possible basionym. C. phlogina appears on current North American Checklist.

Smith et. al 2009 has:

C. citrina as “all parts K+ purple”; (20-)30-60(-70) um diameter; paraphyses for C. citrina “often with narrow tips, or clavate to 3um wide”; spores (10-)10.5-14.8(-15.2) x (4-)5-7.5(-8) (this specimen larger), septum 3-5; (Wetmore 2007 has hymenium as 60-75 um tall) C. phlogina as “thallus and soredia K- (contradicts this specimen); soredia (25-)30-60(-80) um diameter; apothecia K-purple”; paraphyses “widening to 7um at tips” (contradicts this specimen); spores (9-)10-13(-13.5) (this specimen larger), septum 2.9-4

Vondrak et. al 2009 – “Although very similar to Caloplaca citrina, this species [C. phlogina] does not belong to the Caloplaca citrina clade.” – based on ITS nrDNA

Proposed Names

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Used references: McCune’s key Caloplaca in Pacific Northwest, Revised July 2011 at http://people.oregonstate.edu/~mccuneb/Caloplaca.pdf; 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; Wetmore, C. M. (2001); The Caloplaca citrina Group in North and Central America. Bryologist 104(1). pp 1-11; Wetmore, C. M. (2004); The Sorediate Corticolous Species of Caloplaca in North and Central America. Bryologist 107: 505-520; Wetmore, C. M. in Nash III, T.H., Gries, C. and Bungartzk, F. (ads) (2007) Lichen Flora of the Greater Sonoran Desert Region, Volume 3; Vondrak, Jan, Pavel Riha, Ulf Arup and Ulrik Sochting (2009) The taxonomy of the Caloplaca citrina group (Teloschistaceae) in the Black Sea region; with contributions to the cryptic species concept in lichenology. Lichenologist 41(6): 571-604; Vondrak, Jan, Jaroslav Soun, Majbrit Zeuthen Sogaard, Ulrik Sochting and Ulf Arup (2010) Caloplaca phlogina, a lichen with two facies’ an example of infraspecific variability resulting in the description of a redundant species. Lichenologist 42(6): 685-692; Arup, Ulf (1995) Lottoral Species of Caloplaca in North America: A Summary and a Key. Bryologist 98(1): 129-140
Based on microscopic features: soredia 40-50um diameter, K+ purple;

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Created: 2012-05-12 16:16:17 EDT (-0400)
Last modified: 2012-05-13 01:28:53 EDT (-0400)
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