Thenal vs Thecal - What's the difference?

As adjectives the difference between thenal and thecal

is that thenal is (anatomy) of or pertaining to the thenar while thecal is of or pertaining to a theca.

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(anatomy) Of or pertaining to the thenar

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Of or pertaining to a theca.

Possessing a theca.

The latter has the sporophyte seta 4 cells in diam. and has thecal Lejeunea -type androecial branches