"I've never heard of pseudonymous before."
From www.m-w.com:
Main Entry: pseu·don·y·mous
Pronunciation: sü-'dä-n&-m&s
Function: adjective
Etymology: Greek pseudOnymos
Date: circa 1706
: bearing or using a fictitious name <a pseudonymous report>;
also : being a pseudonym-
pseu·don·y·mous·ly adverb-
pseu·don·y·mous·ness noun
Hats off to aD for coming up with such an elegant & succinct description as to their reasoning!