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I.—On Homœomorphy among Fossil Plants
Published online by Cambridge University Press: 01 May 2009
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Students of palæobotany, when concerned with casts and impressions of fossil plants as distinguished from petrifactions, have often to face difficulties in the course of their examination of such remains, some of which are peculiar to this branch of palæontology. Even when a large number of specimens of any particular type of foliage, or other organs, are available for comparison, it is often difficult to decide how far one set of casts and impressions can be regarded as distinct from another. Authorities differ in their ideas of the aggregate of differences necessary to constitute genera and species. This difficulty, although common to the systematist in the study of recent plants, is greatly intensified when dealing with fossils, on account of the fragmentary nature of the evidence.
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References
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page 388 note 1 For a short account of these biological groups see Henslow, Natural Science, vol. xv (1899).
page 388 note 2 Seward: “Fossil Plants,” vol. i, chapter v.
page 388 note 3 Buckman: ibid.., p. 232.