In

prefix meaning absent, inaperturate_17, 103

pollen grain without distinct aperture(s). [64, 113]

Antonym: aperturate. infoldings_88-93

a consequence of harmomegathy (aperture sunken, interapertural area sunken, irregularly infolded). infra-

prefixmeaning beneath, infratectum _21, 23, 200-202

layer between tectum and foot layer or endexine (if foot layer is missing); infra-tectum can be alveolate, columellate, granular or absent. [1] intectate, see atectate

Comment: "atectate" is the more common term

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