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''Placidium'' is a genus of crustose to squamulose to almost foliose lichens. The genus is in the Verrucariaceae family. Most members grow on soil (are terricolous), but some grow on rock (saxicolous).〔 The fruiting bodies are perithecia, flask-like structures immersed in the lichen body (thallus) with only the top opening visible, dotting the thallus.〔 Members of the genus are commonly called stiplescale lichens or earthscale.〔Field Guide to California Lichens, Stephen Sharnoff, Yale University Press, 2014, ISBN 978-0-300-19500-2〕 Lichen spot tests are all negative.〔 Members of the genus lack rhizenes, but otherwise resemble members of the genus ''Claviscidium''.〔 ==Species== * ''Placidium acarosporoides'' * ''Placidium arboretum'' * ''Placidium lachneum'' * ''Placidium squamulosum'' 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Placidium」の詳細全文を読む スポンサード リンク
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