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.
Ex. 1. 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: 303. 1988).
Ex. 2. 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).
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.
Ex. 3. 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 publication.
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