DIVISION II. RULES AND RECOMMENDATIONS
CHAPTER IV. EFFECTIVE AND VALID PUBLICATION
SECTION 1. CONDITIONS AND DATES OF
31.1. The date of effective publication is the date on which the printed matter became available as defined in
Art. 29 and 30. In the absence of proof establishing some other date, the one appearing in the printed matter must be accepted as correct.
Individual parts of Willdenow's Species plantarum
were published as follows: 1(1), Jun 1797; 1(2), Jul 1798; 2(1), Mar
1799; 2(2), Dec 1799; 3(1), 1800; 3(2), Nov 1802; 3(3), Apr-Dec 1803;
4(1), 1805; 4(2), 1806; these dates are presently accepted as the dates
of effective publication (see Stafleu & Cowan in Regnum Veg. 116:
T. M. Fries first published Lichenes arctoi
in 1860 as an independently paginated preprint, which predates the
identical version published in a journal (Nova Acta Reg. Soc. Sci.
Upsal. ser. 3, 3: 103-398. 1861).
Ex. 3. Diatom Research
, vol. 2, no. 2, bears a
title-page date of Dec 1987, but the authors of a paper included in a later issue (vol. 3, p.
265) stated that the date of publication was 18 Feb 1988, which therefore should be taken as the
date of all nomenclatural novelties in that issue of the journal.
Note 1. Effective publication requires distribution of printed
matter, which establishes the date of effective publication, even if a name is published in a
periodical with parallel printed and electronic versions.
The paper in which the name Ceratocystis omanensis
& al. is described was available online in final form on Science Direct on 7 November 2005, and distributed
in a printed version in Mycological Research
110(2): 237-245 on 7 March 2006. The date of
effective publication of the name for the purposes of this Article is 7 March 2006 and not 7 November 2005.
31.2. When separates from
periodicals or other works placed on sale are issued in advance, the
date on the separate is accepted as the date of effective publication
unless there is evidence that it is erroneous.
The names of the Selaginella
species published by Hieronymus (in Hedwigia 51: 241-272) were
effectively published on 15 October 1911, since the volume in which the
paper appeared, though dated 1912, states (p. ii) that the separate
appeared on that date.
31A.1. The date on which the
publisher or publisher's agent delivers printed matter to one of the
usual carriers for distribution to the public should be accepted as its
date of effective
2006, by International Association for Plant Taxonomy. This page last updated