histogen

[his-tuh-juhn, -jen]

noun Botany.

a region in a plant in which tissues differentiate.

Origin:
1920–25; histo- + -gen

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Histogen is always a great word to know.

So is bryophytes. Does it mean:

phylum of green, nonvascular, seedless plants comprised of true mosses, hornworts and liverworts

phase in plant life which starts with a zygote produced by sexual reproduction

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Collins

World English Dictionary

histogen (ˈhɪstəˌdʒɛn)

—n
	corpus See tunica (formerly) any of three layers in an apical meristem that were thought to give rise to the different parts of the plant: the apical meristem is now regarded as comprising two layers

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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histogen

his·to·gen