Buellia disciformis

Buellia disciformis
	Buellia disciformis
Scientific classification
Kingdom:	Fungi
Division:	Ascomycota
Class:	Lecanoromycetes
Order:	Teloschistales
Family:	Caliciaceae
Genus:	Buellia
Species:	B. disciformis
Binomial name
	Buellia disciformis; (Fr.) Mudd

Buellia disciformis (boreal button lichen) is a thin, bluish to pale gray rimose to areolate crustose lichen that grows on bark (rarely also on wood) in temperate forests in the northern USA and Europe, and at high altitudes in Arizona, down to 500 metres (1,600 ft) in coastal areas of California.[1]^:230 [2] Flat apothecia with black discs are .2-.7 mm in diameter and sessile (neither raised or immersed in the thallus), with noticeable lecideine margins.[2][1]^:230 Lichen spot tests are negative except for K+ yellow.[1]^:230 Secondary metabolites include atranorin, fulgidin, and sometimes traces of fulgoicin and norfulgoicin.[2] B. erubescens is similar and more often found on wood than the bark loving B. disciformis, and has smaller spores.[1]^:230

References

Field Guide to California Lichens, Stephen Sharnoff, Yale University Press, 2014, ISBN 978-0-300-19500-2
Buellia disciformis, Lichen Flora of the Greater Sonoran Desert Region, Nash, T.H., Ryan, B.D., Gries, C., Bugartz, F., (eds.) 2001, Archived 2014-11-09 at the Wayback Machine

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[SSFGCL-1] Field Guide to California Lichens, Stephen Sharnoff, Yale University Press, 2014, ISBN 978-0-300-19500-2

[BdLFGSDR-2] Buellia disciformis, Lichen Flora of the Greater Sonoran Desert Region, Nash, T.H., Ryan, B.D., Gries, C., Bugartz, F., (eds.) 2001, Archived 2014-11-09 at the Wayback Machine