The structure & development of the mosses and ferns (Archegoniatae) . oject, a section throughone of the teeth shows that it is divided into an upper andlower tier of cells, the apical cell terminating the upper division no doubt corresponds to the first horizontaldivision in the outer nodal cell from which the leaf-toothoriginally comes. In one a little older (Fig. 233, B), in thisupper tier of cells a line of cells occupying the axis is evident{fb), extending from the base of the leaf nearly to the summit,and growing at its outer end by the addition of cells derivedfrom the inner pa
The structure & development of the mosses and ferns (Archegoniatae) . oject, a section throughone of the teeth shows that it is divided into an upper andlower tier of cells, the apical cell terminating the upper division no doubt corresponds to the first horizontaldivision in the outer nodal cell from which the leaf-toothoriginally comes. In one a little older (Fig. 233, B), in thisupper tier of cells a line of cells occupying the axis is evident{fb), extending from the base of the leaf nearly to the summit,and growing at its outer end by the addition of cells derivedfrom the inner part of the youngest upper segments of theterminal cell of the This is the beginning of the singlevascular bundle found in each leaf ^ Rees (2), p. Each tooth is here regarded as a leaf, the sheath as a circle of confluent leaves. 440 MOSSES AND FERNS CHAP. Shortly after this first indication of the vascular bundle of theleaf can be seen, the cells of the cortex immediately outside thecentral pith begin to divide rapidly by longitudinal walls and form
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Keywords: ., bookcentury1800, bookdecade1890, bookidstructuredev, bookyear1895
