Buellia disciformis, the 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. Flat apothecia with black discs are .2-.7 mm in diameter and sessile (neither raised or immersed in the thallus), with noticeable lecideine margins. Lichen spot tests are negative except for K+ yellow. Secondary metabolites include atranorin, , and sometimes traces of and . B. erubescens is similar and more often found on wood than the bark loving B. disciformis, and has smaller spores.
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| - Buellia disciformis (en)
- Rönnlav (sv)
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| - Buellia disciformis, the 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. Flat apothecia with black discs are .2-.7 mm in diameter and sessile (neither raised or immersed in the thallus), with noticeable lecideine margins. Lichen spot tests are negative except for K+ yellow. Secondary metabolites include atranorin, , and sometimes traces of and . B. erubescens is similar and more often found on wood than the bark loving B. disciformis, and has smaller spores. (en)
- Rönnlav (Buellia disciformis) är en lavart som först beskrevs av Elias Fries, och fick sitt nu gällande namn av Mudd. Rönnlav ingår i släktet Buellia och familjen Physciaceae. Arten är reproducerande i Sverige. Inga underarter finns listade i Catalogue of Life. (sv)
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| - *Lecidea parasema var. disciformis (en)
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| - Buellia disciformis, the 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. Flat apothecia with black discs are .2-.7 mm in diameter and sessile (neither raised or immersed in the thallus), with noticeable lecideine margins. Lichen spot tests are negative except for K+ yellow. Secondary metabolites include atranorin, , and sometimes traces of and . B. erubescens is similar and more often found on wood than the bark loving B. disciformis, and has smaller spores. (en)
- Rönnlav (Buellia disciformis) är en lavart som först beskrevs av Elias Fries, och fick sitt nu gällande namn av Mudd. Rönnlav ingår i släktet Buellia och familjen Physciaceae. Arten är reproducerande i Sverige. Inga underarter finns listade i Catalogue of Life. (sv)
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