Transactions and proceedings of the Royal Society of South Australia (Incorporated) . (2/ Fig. 4. Mesembrioxylon, sp. Yalloum A. Radial section showing pits in the field and tracheal pitting. x275. brown contents. There may be one or two oval, oblique,apparently simple pits in the field (fig. 2). The presence ofpits on the horizontal and tangential walls of the rays is wellknown to be a difiicult character to determine,(^) and negative (4) Seward, vol. iv., p. 169. 531 evidence is unsatisfactory; however, pits do not seem to bepresent. No rims of Sanio are apparent. Mesembrioxylon, sp. Moorlan
Transactions and proceedings of the Royal Society of South Australia (Incorporated) . (2/ Fig. 4. Mesembrioxylon, sp. Yalloum A. Radial section showing pits in the field and tracheal pitting. x275. brown contents. There may be one or two oval, oblique,apparently simple pits in the field (fig. 2). The presence ofpits on the horizontal and tangential walls of the rays is wellknown to be a difiicult character to determine,(^) and negative (4) Seward, vol. iv., p. 169. 531 evidence is unsatisfactory; however, pits do not seem to bepresent. No rims of Sanio are apparent. Mesembrioxylon, sp. Moorlands B (fig. 3).A considerable amount of compression has taken place incertain regions of this specimen. The medullary rays and thelumen of the tracheids are filled with brown C Fig. 5. Mesembrioxylon, sp. Yiallourn B. Radial section showing pits in the field and pitting on the radial and oblique walls of the tracheids. x275. Growth rings are present. Bordered pits uniseriate, separate, and circular (fig. 3)^only showing in regions of better preservation. Medidlary rays uniseriate, two or three cells high, rarelyfour or five. Many ray cells have dark-brown contents. 532 The pitting in connection with the medullary rays isnot preserved. Rims of Sanio not observed. It would appear that there is a close affinity betweenthe two specimens. A resemblance to the living genusGallitris is evident, but until further material and moi:edata are available it seems inadvisable to definitely imply anaffinity with a particular existing genus purely on the evid-ence of the wood. It seems, from the characters describedfor both specimens, that they are best included under thegenus Mesem^rioxylon instituted by Professor Seward.^^
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectscience, bookyear1912
