International Code of Botanical Nomenclature
(Tokyo Code), Electronic version
CHAPTER IV. EFFECTIVE AND VALID PUBLICATION
SECTION 2. CONDITIONS AND DATES OF VALID PUBLICATION OF
NAMES
Article 38
38.1. In order to be validly published, a name of a new
taxon of fossil plants of specific or lower rank published on
or after 1 January 1912 must be accompanied by an illustration
or figure showing the essential characters, in addition to the
description or diagnosis, or by a reference to a previously and
effectively published illustration or figure.
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