. Fossil plants : for students of botany and geology . Paleobotany. 128 THALLOPHYTA. [CH. in his paper published in 1855; it shows a section of a fish- scale from the Kimeridge clay which has been attacked by a boring organism. Rose attributes the dichotomously branched canals to some " infusorial ;. !Fio. 27. A, Section of a fish-soale from the Kimeridge Clay, showing branched canals, made by a boring organism, x 85. B, Section of a Solen shell, penetrated in all directions by the boring thallus of Ostracoblabe (a fungus?), X 330. C, Piece of the thallus of Ostracoblabe iso
. Fossil plants : for students of botany and geology . Paleobotany. 128 THALLOPHYTA. [CH. in his paper published in 1855; it shows a section of a fish- scale from the Kimeridge clay which has been attacked by a boring organism. Rose attributes the dichotomously branched canals to some " infusorial ;. !Fio. 27. A, Section of a fish-soale from the Kimeridge Clay, showing branched canals, made by a boring organism, x 85. B, Section of a Solen shell, penetrated in all directions by the boring thallus of Ostracoblabe (a fungus?), X 330. C, Piece of the thallus of Ostracoblabe isolated by decalcification, x 745. A, after Eose. B and C, after Bornet and Flahault. In the important paper by MM. Bornet and Flahault on perforating algae a full description is given of various boring forms belonging to the Chlorophyceae and the Cyanophyceae'. The canals which these algae produce in calcareous shells and other hard substances are of the same type as those previously described in fossil corals, fish-scales and bones. In dealing with living perforating Thallophytes the colour and other cell- contents often enable us to distinguish between algae and fungi, but in fossil specimens such tests cannot be applied. The fossil tubular borings may or may not show traces of the trans- verse septa and reproductive cells; it is often the case that no 1 Bornet and Flahault (89").. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Seward, A. C. (Albert Charles), 1863-1941. Cambridge : University Press
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishercambr, bookyear1898
