| 释义 |
cruˈstose, a.
[ad. L. crustōs-us: see next.]
Of the nature of a crust; crustaceous; esp. designating a lichen having a thin, closely adhering thallus (now more common than crustaceous in this sense).
1879W. A. Leighton Lichen-flora of Gt. Brit. (ed. 3) 509 Crustose, forming a crust. 1882Syd. Soc. Lex., Crustose, thick-skinned. Applied to certain mushrooms which form laminæ like crusts. 1938G. M. Smith Cryptogamic Bot. I. xv. 515 These lichens are always crustose and with the thallus forming an incrustation that adheres closely to the substratum. 1959New Scientist 5 Feb. 294/1 In a crustose lichen there is an upper cortex and a rather poorly defined gonidial layer of algal cells. 1967M. E. Hale Biol. Lichens i. 10 Lichens are traditionally classified into three growth forms: crustose, foliose and fruticose. |