An alternative form of cryptogamic; relating to or characteristic of plants that reproduce by spores rather than flowers and seeds.
From 'cryptogamic' + the suffix '-al' (relating to), a variant form that appeared in 18th-century botanical texts as taxonomy became more standardized.
Both 'cryptogamic' and 'cryptogamical' mean the same thing, but 'cryptogamical' sounds like old Victorian naturalists—it's the kind of word you'd hear in a dusty museum lecture from 1850.
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