psyoodevernia, and what it gets right
heard as psyoodevernia
spelled pseudevernia
Pseudevernia. The letters eu carry the vowel.
What the ear did
This rendering keeps the difficult silent p and then spells the easy part phonetically, which is a common shape for a heard spelling. People hold on to whatever they know is unusual and improvise the rest.
P-S-E-U-D-E-V-E-R-N-I-A
The full entry for pseudevernia covers the name itself.