. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. i6o STERILE AND FERTILE REGIONS Goethe's theory : it must be enquired whether this is a justifiable assump- tion. This question has not been too exactly scrutinised by his followers, who translated his "progressive metamorphosis'' into terms of an evolutionary progression. The basis for the assumption was primarily the succession of events as seen in the individual life of the higher plants; but a certain laxity of view was further encouraged by the irregularities of number and position and of ti
. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. i6o STERILE AND FERTILE REGIONS Goethe's theory : it must be enquired whether this is a justifiable assump- tion. This question has not been too exactly scrutinised by his followers, who translated his "progressive metamorphosis'' into terms of an evolutionary progression. The basis for the assumption was primarily the succession of events as seen in the individual life of the higher plants; but a certain laxity of view was further encouraged by the irregularities of number and position and of time of appearance of the sporangia in the Leptosporangiate Ferns. These plants were accorded an undue prominence in the early study of Pteridophytes, and for long the belief was held that they were the prototypes of all Vascular Plants. But it is now sufficiently clear that the Leptosporangiate Ferns are relatively late derivative forms, and that the types of Ferns of the primary rocks were more precise and. $N s^.. (f^sp ( '-* V. 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 Bower, F. O. (Frederick Orpen), 1855-1948. London, Macmillan and Co. , Ltd.
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