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vagrant lichen
A vagrant lichen is a lichen that is either not attached to a substrate, or can become unattached then blow around, yet continue to grow and flourish.〔(Vagrant lichens, Australian Botanic Garden )〕 Some authors use the expression "erratic lichen" as synonymous with "vagrant lichen", and others only for those lichens that never attach (obligate erratic).〔 Vagrant lichens generally occur in open and windswept habitats, all over the world, in all kinds of temperature zones.〔 Habitats include saltbush (mallee) vegetation zones in Australia, steppes of Eurasia, Arctic tundra, and the North American prairie.〔 They range from the low elevations of the Namib Desert to the high altitude Andean páramo.〔 There are under 100 identified vagrant species, most commonly in the ''Aspicilia'' and ''Xanthoparmelia'' genera.〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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