. On the structure and affinities of Sigillaria, Calamites and Calamodendron [microform]. Paleobotany; Paléobotanique. ?ard the* Kin the 3d the be- Ironi those |i 90- Cnlamila described i otherwise' lio roots of DAWSONâSIOILLARIA, CALAMITE9, AND CALAMODENDRON. 161 Wig. 9. Stcmhergia, pith of the same, natural size; 9rt, discigerous tissue of the same. 10. Another stem, probably Conifprous, w'.h Stembergia pith. 11. Woody tissue of j)ro8trate SigiHarin : 11«, bast-tissue of the same. 12. Woody i-issuo of a Sigillaria; 12 >, cross section, magnified, showing compression of the tissue
. On the structure and affinities of Sigillaria, Calamites and Calamodendron [microform]. Paleobotany; Paléobotanique. ?ard the* Kin the 3d the be- Ironi those |i 90- Cnlamila described i otherwise' lio roots of DAWSONâSIOILLARIA, CALAMITE9, AND CALAMODENDRON. 161 Wig. 9. Stcmhergia, pith of the same, natural size; 9rt, discigerous tissue of the same. 10. Another stem, probably Conifprous, w'.h Stembergia pith. 11. Woody tissue of j)ro8trate SigiHarin : 11«, bast-tissue of the same. 12. Woody i-issuo of a Sigillaria; 12 >, cross section, magnified, showing compression of the tissue; 18 c, discigerous and pseudo-scalariform tissue of the same. 19. Portion of a multiporous vessel of a true Calamites, magnified to the same scale with figs. 17« & 176. 20. Stem of erect Cidamodendnm (S. Joggins, Nova Scotia), showing its external surface, one-third nat. size. 21. Base of stem of Calamites (S. Joggins), showing rhizoma, reduced. 22. Node of Calamites, showing scars of verticillate branchlets and of radial processes, Plate X. ]l%. 23. Eadial section of stem of Sigillaria of the type of S. Brownii, Diiwson, restored, natural size: «, pith; h, woody cylinder; c, cellular inner bark ; d, fibrous bark ; e, outer cortical layer. 24. Radial section of the woody cylinder, magnified (letters as above); and portions of the tissues more highly magnified below: h], inner pseudo- scalariform cylinder; b'l, 3, 4, discigerous outer cylinder. 25. Radial section, more highly magnified, showing one of the radiating bundles of vessels (this section has been inverted); 2a«, single pseudo- scalaril'orni vessel from radiating bundle. â 20. Tangential section of the same stem, showing the woody fibres and one of the radial bundles, and the medullary rays. > 27, Tangential section showing woody fibres and medullary rays, more ' highly magnified. 28. Radial arrangement of wof)dy fibres, magnified. ⢠\ir^ 2',). Fibres or elongated cells of the bark {d). Note.â
Size: 1642px × 1521px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, bookpublisherslsn, bookyear1871
