beard lichen: References & Edit History

Article Contributors

Primary Contributors

  • Melissa Petruzzello
    Melissa Petruzzello (she/her) is Assistant Managing Editor and covers plants, algae, fungi, insects, spiders, renewable energy and environmental engineering. She also handles certain topics in Christianity, notably Protestant history and churches. 

Other Encyclopedia Britannica Contributors

Article History

Type Description Contributor Date
Article thoroughly revised. Mar 31, 2021
Add new Web site: WebMD - Usnea. Nov 13, 2013
Media added. Aug 28, 2008
Article added to new online database. Jul 20, 1998
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