Someone typed lukobryum. How far off is it?
heard as lukobryum
spelled leucobryum
Three letters. The first half is written leuco-, so the name is leucobryum.
What the ear did
Say the word and the first syllable is a clean loo, which invites both the dropped e and the k. Greek kappa is spelled c in Latin, and the eu of leukos survives even where English has stopped pronouncing it as two sounds.
L-E-U-C-O-B-R-Y-U-M
The full entry for leucobryum covers the name itself.