ICZN "50 year rule"

[Cris Guppy or Aud Fischer]

There is no 50 year rule in "the Code", the closest is roughly a 100 year rule:

Section 23.9, Reversal of precedence. In accordance with the purpose of the Principle of Priority [Art. 23.2], its application is moderated as follows:
23.9.1 prevailing usage must be maintained when the following conditions are met:
23.9.1.1. the senior synonym or homonym has not been used as a valid name after 1899, and
23.9.1.2. the junior synonym or homonym has been used for a particular taxon, as its presumed valid name, in at least 25 works, published by at least 10 authors in the immediately preceding 50 years and encompassing a span of not less than 10 years.

It seems to me to be perfectly reasonable to pemanently ignore name if it has not been used as a valid name for over 100 years.
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