Английская Википедия:Amazonotrema

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Amazonotrema is a monotypic genus of lichenised fungi in the family Graphidaceae.Шаблон:Sfn It was circumscribed in 2009 by Klaus Kalb and Robert Lücking for the species Amazonotrema nigrum.Шаблон:SfnШаблон:Sfn The type specimen of A. nigrum was collected from virgin rainforest along the Rio Negro in the Brazilian state of Amazonas.

Taxonomy

The genus name is a combination of Amazon, for the Amazon basin region from which the type specimen was collected, and trema, for the systematic position of the genus within the family Graphidaceae; it falls into the "thelotremoid" group because of the structure of its fruiting bodies (Шаблон:Lichengloss).Шаблон:Sfn Шаблон:As of, it had not been genetically sequenced, so its relationship to other genera in the family is uncertain.Шаблон:Sfn

Description

Amazonotrema nigrum is a crustose lichen with a smooth, grey, and somewhat glossy surface, and it grows on tree bark, stripped wood and tree fern stems.Шаблон:Sfn Unlike most plant-dwelling lichens (but like many other tropical, crustose lichens),Шаблон:Sfn it lives partially immersed in the bark or stems on which it grows – a strategy known as Шаблон:Lichengloss.Шаблон:Sfn Its apothecia, which tend to be dispersed across the lichen's surface, are steep-sided, broadly rounded at the apex, and the same colour as the thallus.Шаблон:Sfn The apothecia's central disc is typically black, which is what led to the scientific name nigrum. Шаблон:Sfn It is not known to have either Шаблон:Lichengloss or Шаблон:Lichengloss (two lichen structures which allow vegetative reproduction).Шаблон:Sfn

Each Шаблон:Lichengloss within the apothecia contains 5–8 Шаблон:Lichengloss, which are chestnut-brown in colour and arranged in rows. The spores themselves are Шаблон:Lichengloss – divided into smaller compartments by intersecting partitions known as Шаблон:Lichengloss.Шаблон:Sfn

The lichen produces several secondary metabolites, including stictic acid and constictic acid.Шаблон:Sfn

References

Citations

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External links

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