|Methuselah's beard lichen|
Dolichousnea longissima is found in boreal forests and coastal woodland in Europe, Asia, and North America.
This lichen is fruticose, with very long stems and short, even side branches. It is considered the longest lichen in the world. The stems are usually 15 to 30 cm in length but are sometimes much longer.
The most frequent host of this lichen is spruce trees. It is currently on threatened status.
It grows on old trees, deciduous or coniferous, including on this nearly 100 year old pear in the Dosewallips river delta of western Washington [picture needed].
- Articus, K. (2004) Neuropogon and the phylogeny of Usnea s.l. (Parmeliaceae, lichenized Ascomycetes). Taxon 53(4): 925-934.
- "Fact Sheet: Usnea longissima in Norway." Nov 08, 1996.http://www.toyen.uio.no/botanisk/bot-mus/lav/factshts/usnelong.htm Archived March 30, 2007, at the Wayback Machine (accessed Dec 19, 2008).
- Sharnoff, S.. "'Usnea longissima..'." http://www.lichen.com/bigpix/Ulongissima.html (accessed Dec 19, 2008).
- Walewski, Joe (2007). Lichens of the North Woods. Duluth, MN: Kollath-Stensaas. ISBN 0-9792006-0-1.
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