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Anatomy

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Abstract

Anatomy, the study of internal construction, as compared to external morphology has the great disadvantage that its object usually is only open for observation after special preparation; often the studied spatial forms have to be synthesized by combination of the observations made on different sections.

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References

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  70. Our detailed knowledge of the stelar structure of Psaronius has been founded by K. G. Stenzel (Über die Staarsteine, Nova Acta 24, 1854, p. 753; Psaronius in: “H. von Meyer, Palaeontographica, Beiträge zur Naturgeschichte der Vorwelt, 12, H. R. Goeppert, Die fossile Flora der Permischen Formation, Cassel 1864/’65”, p. 46; Die Psaronien, Beobachtungen und Betrachtungen, in: Beiträge zur Paläontologie und Geologie Österreich-Ungarns und des Orients, 19, 1906, p. 85); R. Zeiller (Bassin houiller et permien d’Autun en d’Épinac, 2, Flore fossile 1, in: Études des gites minéraux de la France, 1890, see p. 178); K. Rudolph (Psaronien und Marattiaceen, Denkschr. k. Akad. d. Wiss. Wien, math, naturw. Kl. 78, 1906, p. 165). Hirmer in his hand-book (op.c. 1927 (f.n. p. 66) see p. 545) gives an elaborate and thorough description of the anatomical facts known about Psaronius. In his text as well as in his diagrams, however, some misconceptions have crept in which may tend to cause confusion. The least harmful of these errors is that in Psaronius infarctus a difference is assumed between two kinds of dictyosteles, as every first, third, fifth etc. dictyo-stele is supposed to have no relation to the continued leaf-traces which only attach to the second, fourth etc. (op.c. p. 559 and fig. 680). As Ps. infarctus, described and pictured from one single specimen by Zeiller (op.c. p. 208) and afterwards elucidated from Zeiller’ figures with perfect clearness by Rudolph (l.c. p. 177, Pl. 2, fig. 1), belongs to the best known Psaronii, we are in the position to state that Ps. infarctus in no way differs from the ordinary scheme and that Hirmer’s fig. 680 should be cancelled. More important are two independent errors, expressed in fig. 674, representing the bundle course in Ps. Ungeri, after Stenzel’s drawings. Hirmer gives a radial section through a cylindrical stem part, and delineates a number of obconical dictyosteles, the one within the other. All these dictyosteles are represented as abutting free on the stelar surface; in a superficially tangential section through the stele we therefore should have met with all dictyosteles. From the description given above it must be clear however, that the outer bundles of the whole stele, from its formation in the sporeling up to its last stages

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  71. Posthumus l.c. 1924 (f.n. p. 75) p. 219. H. Karsten, quoted there, has been the first to understand the structure of a polycyclic stele (1847).

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  96. Hirmer introduces the new terms exophelloderm for phellem and endophel-loderm for phelloderm (Hirmer op.c. 1927, p. 216). As phellem and phelloderm are already neutral terms indicating the tissues formed to the outside and to the inside of the phellogen, irrespective of their differentiation, there seems no reason for this introduction.

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  97. For the terms polygenous origin and transition cambium see Schoute in J. J. Beyer, Die Vermehrung der radialen Reihen im Cambium, Rec. trav. bot. néerl. 24, 1927, p. 631, see p. 649.

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  102. W. C. Williamson, On the organization of the fossil plants of the Coal-measures, II, Lycopodiaceae: Lepidodendra and Sigillariae, Phil. Trans. London, 162, 1873, p. 197, see Pl. 30. fig. 41; Williamson l.c. 1887 (f.n. 5 above), PL 8, fig. 15.

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  105. B. Renault, Structure comparée de quelques tiges de la flore carbonifère, Nouv. Arch, du Mus. d’Hist. Nat. 2nd ser, 2, 1879, p. 213, see p. 252 and especially PL 10, fig. 6, 9–14.

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  106. Kisch, l.c. p. 308.

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  107. Williamson op.c. 1887 (f.n. p. 88), PL 8, fig. 23, 24.

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  108. Described for Sigiïlaria spinulosa in: B. Renault, Recherches sur les végétaux silicifiés d’Autun, Étude du Sigiïlaria spinulosa, par MM. B. Renault et Grand’Eury, Mém. prés, par divers savants à l’Acad. d. Sc. de l’Inst. Nat. de France, 22, 9, 1876, see especially the half schematic drawings PL 1, fig. 5, PL 4, fig. 20–22 for the general dilatation, and fig. 23 and its explanation for the gradual difference between inner and outer part.

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  109. Kisch, l.c. p. 308.

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  110. E. Russow, Vergleichende Untersuchungen betreffend die Histiologie der vegetativen und sporenbildenden Organe und die Entwickelung der Sporen der Leitbündel-Kryptogamen, etc. Mém. Acad. Imp. d. Sc. St. Pétersbourg, 7th ser. 19, 1, 1872, see p. 119.

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  111. Van Tieghem, l.c. (f.n. p. 86), p. 171.

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  112. Scott, l.c. 1920 (f.n. p. 79), p. 80; Hirmer l.c. 1927, p. 352; Van Tieghem on the other hand writes that the secondary xylem first appears outside the protoxylem (l.c. p. 173).

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  113. Scott, op. c. 1920, p. 25.

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  114. Hirmer op.c. 1927, p. 389.

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  115. Hirmer overrates both the frequency and the amount of this dilatation when he supposes (op. c. 1927, p. 392) it to be a general feature of Arthropitys and believes it to be correlated with a striking increase of the pith cavity. In A. bistriata the whole phenomenon evidently failed (see B. Renault, Bassin Houiller et Permien d’Autun et d’Épinac, IV, Flore fossile, 2, Paris 1893-’96, in: Études des gîtes minéraux de la France; see especially Pl. 45, fig. 1, 3, Pl. 46, fig 2, 3) and in A. communis it may almost have been absent in some cases (ibid. Pl 48, fig, 2, 6); A. gigas on the other hand perhaps shows slight indications by the extension of the parenchyma cells perpendicular to the earliest wood (ibid. Pl. 50, fig. 2). The amount of the dilatation no doubt is exaggerated by Hirmer because he bases it on a comparison between morphologically incomparable objects: a strong branch with a great number of stout primary vascular bundles and a large pith cavity on one hand, and a weaker branch on the other hand where everything has been laid down on a smaller scale. Cf. moreover the related phenomena in Astromyelon in § 3, sub B II.

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  116. Lang, l.c. (p. 73); C. West and H. Takeda, On Isoetes japonica, A. Br., Trans. Linn. Soc. London, 2nd ser. 8, Botany, 1915, p. 333, see p. 343.

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  117. Special treatments of the root being rare for all plant groups, the works of Van Tieghem l.c. 1870/71 (f.n. p. 72) and of G. Poirault, Recherches anatomiques sur les Cryptogames vasculaires, Ann. d. sc. nat., 7th ser. 18, 1893, notwithstanding their early date may be quoted here; the latter contains an extensive chapter on the root (p. 114–158) with full quotation of the older literature.

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  118. H. Graf zu Solms-Laubach, Der tiefschwarze Psaronius Haidingeri von Manebach in Thüringen, Zeitschr. f. Bot. 3, 1911, p. 721.

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  119. In a recently published preliminary communication (B. Sahni, The roots of Psaronius, Intra-cortical or extra-cortical? — A discussion, Current Science 1935, p. 555) the author returns to the old view of Stenzel, that this tissue may have been secondary cortex, developing pari passu with the roots after the leaves had fallen. His arguments as given in the preliminary note are that at the outside of the pseudocortex a periderm was developed, and further that in a recent Liliacea Asphodelus tenuifolius numerous roots grow down through the cortex of the main root, so as to distend the main root very strongly. As far as I see at present neither of these facts can invalidate in the least the evidence brought forward by Solms-Laubach.

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  120. Nägeli und Leitgeb, l.c. (f.n. p. 72) p. 82.

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  122. Ph. van Tieghem, Traité de botanique, 2nd ed. I, Paris 1891, p. 681.

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  123. Schoute, op.c. 1902/3 (f.n. p. 68), see p. 142.

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  124. See sor instance the specimen of Equisetum pictured by Van Tieghem l.c. 1870/71 (f.n. p. 72), Pl. 5, fig. 22.

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  125. See sor instance the specimens pictured by Van Tieghe l.c. 1870/’71 on PL 5, fig. 18 (Lastraea) and 27 (Botrychium).

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  126. See sor instance the specimens pictured by Van Tieghem l.c. 1870/71, PL 4, fig. 11 (Marattia); a much larger and moreover a fistular pith may be found in large specimens of Astromyelon, the root of Calamités, the smaller specimens having a solid pith or no pith at all.

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  127. Van Tieghem l.c. 1870/’71, p. 86.

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  131. Nägeli und Leitgeb, l.c. 1868, p. 129.

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  134. Nägeli und Leitgeb, l.c. 1868, p. 134, Pl. 19, fig. 8–10.

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  135. Russow l.c. (f.n. p. 90), p. 122; Van Tieghem l.c. 1870/’71, p. 108; Poirault l.c. (f.n. p. 93), p. 142.

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  136. Nägeli l.c. 1858 (f.n. 1 on p. 71), p. 52.

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Fr. Verdoorn A. H. G. Alston I. Andersson-Kottö L. R. Atkinson H. Burgeff H. G. Du Buy C. Christensen W. Döpp W. M. Docters Van Leeuwen H. Gams M. J. F. Gregor M. Hirmer R. E. Holttum R. Kräusel E. L. Nuern-Bergk J. C. Schoute J. Walton K. Wetzel S. Williams H. Winkler W. Zimmermann

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Schoute, J.C. (1938). Anatomy. In: Verdoorn, F., et al. Manual of Pteridology. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-6111-6_2

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