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Über den Verzweigungsvorgang bei Psilotum und Selaginella mit Anmerkungen zum Begriff der Dichotomie / On the Branching Process of Psilotum and Selaginella With Remarks on the Concept of Dichotomy

Wolfgang Hagemann
Plant Systematics and Evolution
Vol. 133, No. 3/4, Dedicated to Walter Leinfellner on the Occasion of His 70th Birthday (1980), pp. 181-197
Published by: Springer
Stable URL: http://www.jstor.org/stable/23642877
Page Count: 17
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Über den Verzweigungsvorgang bei Psilotum und Selaginella mit Anmerkungen zum Begriff der Dichotomie / On the Branching Process of Psilotum and Selaginella With Remarks on the Concept of Dichotomy
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Abstract

After a critical evaluation of the concept of dichotomous branching in Cormophytes the shoot apical meristems of Psilotum triquetrum and Selaginella speciosa are described. In Psilotum only the terminal meristems of the cryptophilic shoots have a three sided apical cell. Those of the photophilic shoots lack a typical apical cell. Selaginella has a two sided apical cell. The process of branching is independent from apical cells. It is due to an equal or unequal fractionation of the initial zone of the shoot apex which embraces all tissues above the leaf producing zone of the apical meristem.

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