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perichaetial

British  
/ ˌpɛrɪˈkiːtɪəl /

adjective

  1. denoting the leaves in mosses that surround the archegonia and, later, the base of the sporophyte

"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

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B, The "perianth" with the small perichaetial leaves below it.

From Project Gutenberg