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Of or relating to a lichen whose thallus is thin, crusty, and closely adherent to or embedded in the surface on which it grows.

[Latin crūstōsus, crusted, from crusta, crust; see kreus- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Biology) biology having a crustlike appearance: crustose lichens.
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈkrʌs toʊs)

forming a crusty, tenaciously fixed mass that covers the surface on which it grows, as certain lichens.
[1875–80; < Latin crustōsus covered with a crust, derivative of crust(a) crust]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.crustose - (of lichens) having a thin crusty thallus that adheres closely to the surface on which it is growing; "crustose lichens"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Larvae build their cases by putting together small sand particles, and they feed on crustose lichens (Gaedike & Zerafa 2010; Regier et al.
Research to answer these two simple questions is not abundant, perhaps because lichens have traditionally been divided into "crustose", "foliose" and "fruticose" growth forms according to their shape and height, a practice that artificially hides a growth continuum (Grube & Hawksworth, 2007; Tehler & Irestedt, 2007).
Some coralline algae grow as tufts and have thin jointed branches that sway with the currents (geniculate coralline algae), while others grow as thick pink crusts (crustose coralline algae (8)).
2008) that vary with respect to exposure and contain hard substrate (bedrock and boulders/cobble) with ample quantities of benthic diatoms, and micro and macro-algae, and are often associated with crustose coralline algae that is thought to serve as a settlement cue (Roberts 2003).
Naturally occurring crustose coralline algae fringe the reefs, lending them a surreal orangey-red glow, and in deeper waters, sharks and schools of snappers and jacks swirl in the currents.
The species identified in this study are found in different growth-form thallus, foliose, fruticose, crustose, squamulose, gelatinous, leprose, distributed on 15 families (Fig.
Ones that look like crusty dried paint on the surface of a rock, or wood, or on tree bark are called crustose. Those that resemble leaves or flower petals are calledfoliose.
Of the species identified, 47% are crustose, 44% are foliose, and 9% are fruticose.