crus·tose

[kruhs-tohs]
adjective Botany, Mycology.
forming a crusty, tenaciously fixed mass that covers the surface on which it grows, as certain lichens.
Compare foliose, fruticose.


Origin:
1875–80; < Latin crustōsus covered with a crust, equivalent to crust(a) crust + -ōsus -ose1

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World English Dictionary
crustose (ˈkrʌstəʊs) [Click for IPA pronunciation guide]
 
adj
biology having a crustlike appearance: crustose lichens

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Crustose is always a great word to know.
So is ort. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a scrap or morsel of food left at a meal.
Example sentences
Yet, he maintained that plant life begins with crustose lichens on igneous
  rocks.
Crustose lichens form crusts that are so tightly attached to the rock that they
  can't be moved without damaging the substrate.
Much of the rock had a crustose coralline algae cover.
Another possible sampling regime includes the use of transects as for crustose
  lichens on rocks.
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