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1)What does the word "Crypto-gamos" mean? Explain not only the etymology, but also, why this name was given (see also Q2 below)

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1. 1)What does the word "Crypto-gamos" mean? Explain not only the etymology, but also, why this name was given (see also Q2 below).2)Who coined this name, and WHY? Hint: Consider the "non-cryptogam" land plants - why are those not "crypto"? Who used "gamein" to classification? 
2. Why is this am "informal" term, an not a formal "taxon"? Use nomenclature AND phylogeny to explain it.