perichaetial
/ˌpɛrɪˈkiːtɪəl/(also perichetial) Botany
adjective
Of, belonging to, or constituting a perichaetium.
Origin
Early 19th century; earliest use found in Samuel Frederick Gray (1766–1828), naturalist and pharmacologist. From perichaetium + -al; compare -ial.