Phytologia, Vol. 73: An International Journal to Expedite Plant Systematic, Phytogeographical and Ecological Publication; August 1992 (Classic Reprint) - Softcover

Moldenke, Harold N.

Softcover

ISBN 10: 133399091X ISBN 13: 9781333990916

Verlag: Forgotten Books, 2018

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Excerpt from Phytologia, Vol. 73: An International Journal to Expedite Plant Systematic, Phytogeographical and Ecological Publication; August 1992

Thirdly, in his monographs of Bidens (shetfl 1937) and Coreopszs (sherif Sherff usually adopted the procedure of choosing as the lectotype' the first cited specimen, or a specimen of the first cited collection, from among the two or more syntypes or syntype collections of previously published names. On the fifteen occasions where he selected lectotypes for names of African Bidens and Coreopsis, in only one instance did he not follow this procedure. In this case, the selection of a lectotype for B. Stuhlmanmz (o. Hoffm.) Sherff, his reasoning is as follows: Hoffmann cited a specimen by Meyer first, but this was a mere scrap, utterly worthless for determination. The fairly large and much better specimen by Stuhlmann, though cited after Meyer's, was clearly the type from which Hoffmann's description was drawn. Indeed, elsewhere Sherff states that the reason a particular specimen has been chosen as the lectotype is because it was the first one cited Thus I consider that he has selected lectotypes mechanically, and in accordance with Article of the icen these choices may be superseded. Although in many instances his choice of lectotype is satisfactory, in a number of cases better specimens are available and new lectotypes are here selected from among these.

Fourthly, when describing a new species, Sherff occasionally cited more than one specimen of a collection in different herbaria as the type. In these cases I do not consider that he has designated a holotype as defined by Ar ticle of the icbn, and so a lectotype has been chosen from among the original material. Further to this point, Sherff often adopted an extremely broad concept of a type specimen, usually including within it all sheets of a particular collection in any one herbarium. Clearly this is not the sense in which most contemporary practising taxonomists use this term. The icen does not expressly provide a definition of a specimen. Article however, states that The type. Is a single specimen. Except. For small herbaceous plants. [when] the type may consist of more than one individual. From this I interpret that the icbnintends that, except for small herbaceous plants, etc., a type specimen should be one individual, or part thereof. It may, there fore, be argued that in those cases where Sherff's type specimen is obviously more than one individual, his act of typification is ineffective. I have, however, adopted the following procedures when dealing with this problem. If the type material cited by Shetfl was formerly all at B, I consider that it may be taken to have been the holotype, as it is not possible in these circumstances to know if his concept of a specimen corresponds with that of the I cbn. The lectotype is then chosen from among the isotypes. If, on the other hand, the type ma terial is still extant and is considered to be of more than one individual, the lectotype is chosen from among these specimens (article of the I cbn).

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Über diese Auflage

• Verlag: Forgotten Books
• Erscheinungsdatum: 2018
• ISBN 10: 133399091X
• ISBN 13: 9781333990916
• Einband: Tapa blanda
• Anzahl der Seiten: 114