different between cryptogamia vs aetheogam

English

From Ancient Greek ????? (a?th?s, “unusual”) + ????? (gámos, “marriage”).

aetheogam (plural aetheogams)

(botany) A cryptogam; a plant of the obsolete taxonomic class Cryptogamia, having neither stamina nor pistils, and therefore no proper flowers, such as an alga, fern, fungus, lichen or moss.

Being derived from the two vowels ?? (a?) (alpha-eta: a?), rather than the diphthong ?? (ai) (alpha-iota: ai), the initial ae- of aetheogam can only properly be written as two separate letters (ae), with a diaeresis atop the e (as aëtheogam) being optional; the spellings *ætheogam and *etheogam are, therefore, erroneous.

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