. On the structure and affinities of Sigillaria, Calamites and Calamodendron [microform]. Paleobotany; Paléobotanique. 150 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. Stemherri'ia>.âThe fine apociracn of the axis of an erect Sif/iVark already referred to sliows that the pith of these trees was of that transversely laminated character which ^Wos rise to the fossils known as Hence we may suppose that some at least of the numerous casts of f^^teniher^ihv found in the Coal-formation have been derived from Sif/illaricr,; but this can be ascertained only by a careful microscopic exam
. On the structure and affinities of Sigillaria, Calamites and Calamodendron [microform]. Paleobotany; Paléobotanique. 150 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. Stemherri'ia>.âThe fine apociracn of the axis of an erect Sif/iVark already referred to sliows that the pith of these trees was of that transversely laminated character which ^Wos rise to the fossils known as Hence we may suppose that some at least of the numerous casts of f^^teniher^ihv found in the Coal-formation have been derived from Sif/illaricr,; but this can be ascertained only by a careful microscopic examination of the remains of woody mat- tor clinginf^ to the casts. The results of the study of a considerublc number of specimens may be stated as follows :â {) A few specimens present multiporous tissue, of the typo of , which, according to Williamson, has a Sternbergia-\)\t\i. Plate VII. fig. 4 affords an instance of this. ((!) Other examples show a true scalariform tissue, comparable ^vith that of LcphJophJoios or Lepuloilendron, but of finer texture. Corda has shown that jjlants of the type of the former genus (his Lomatophhm) had Sternher<ila-]n\h9,. Some plants of this group are by external cha- racters loosely reckoned bybotanists as ribless Su/nhria;(Chtthrariay, but I believe that they are not related even ordinally to that genus. Plate VII. fig. 5 represents a Sfernherf/in, with tissue partly reticu- lated and partly scalariform. Plate VIII. fig. 7 represents a speci- men with true scalariform tissue. Plate VII. fig. 0 is a scalariform vessel of Lephlophhios drawn to the same scale for comparison. It will be seen that it is of much coarser texture. {d). The majority of carboniferous Stn'nhenjm show structures identical with those described above as occurring in erect SI(/!Uitrl(i'. Such Stcrnher<ii/i!hria with Stern- herf/ia-])ith (fig. {)), of great beauty, and not dissimilar from those sometimes found in the erect S!,j!ll(n'ia;. The tissue encl
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