forming a crusty, tenaciously fixed mass that covers the surface on which it grows, as certain lichens.
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How to use crustose in a sentence
On shaded sandstone, intermingled with an ash-gray, crustose thallus, which appeared like a sterile Pertusaria.Ohio Biological Survey, Bull. 10, Vol. 11, No. 6 | Bruce Fink and Leafy J. Corrington
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