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[kruhs-tohs] /ˈkrʌs toʊs/
adjective, Botany, Mycology
forming a crusty, tenaciously fixed mass that covers the surface on which it grows, as certain lichens.
Compare foliose, fruticose.
Origin of crustose
1875-80; < Latin crustōsus covered with a crust, equivalent to crust(a) crust + -ōsus -ose1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for crustose
  • crustose lichens form crusts that are so tightly attached to the rock that they can't be moved without damaging the substrate.
  • In the control tanks, the presence of crustose coralline algae was visually apparent, owing to its red hue.
  • Much of the rock had a crustose coralline algae cover.
  • Yet, he maintained that plant life begins with crustose lichens on igneous rocks.
  • Another possible sampling regime includes the use of transects as for crustose lichens on rocks.
British Dictionary definitions for crustose


(biology) having a crustlike appearance: crustose lichens
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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