. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. EMBRYOLOGY 393. Fig. 214. Embryo of Equisetum. , Equisetum arvense, L. I. and II., the same embryo in different positions : in I. the median wall is visible, in II. the transverse wall. X 300. , a more advanced embryo showing development of the stem and leaf-sheath, X250. V., an embryo still further developed, but not dissected free from the prothallus, and showing the orientation relatively to the archegonium. j/=the stem apex ; z»=the first leaf-sheath; w=the root. X98. VI. and VII., E
. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. EMBRYOLOGY 393. Fig. 214. Embryo of Equisetum. , Equisetum arvense, L. I. and II., the same embryo in different positions : in I. the median wall is visible, in II. the transverse wall. X 300. , a more advanced embryo showing development of the stem and leaf-sheath, X250. V., an embryo still further developed, but not dissected free from the prothallus, and showing the orientation relatively to the archegonium. j/=the stem apex ; z»=the first leaf-sheath; w=the root. X98. VI. and VII., Equisetum palusire, L. young embryo still in the archegonium, stem and foot are visible. X300. VII. =an embryo further advanced, and dissected free, and orientated 90" as compared with VI. The root (-zu) and stem (st) are visible. X300. £=basal wall; 71=transverse wall; m = median wall; £=epibasal and A=hypobasal region; z/=the first leaf-sheath. (After Sadebeck, in Engler and Prantl, Nat. ;). 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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