the ending
Is there an i before the -um?
Yes: lycopodium.
the ending
The fourth syllable is the faintest in the word and is easy to lose entirely. The i is not decoration. It is the last vowel of podium, which is the same word that ends polypodium and the same word English uses for the block a conductor stands on.
The class
The last syllable, where botanical Latin keeps letters that speech drops.
Same name
Other spellings recorded for lycopodium
The name