The structure & development of the mosses and ferns (Archegoniatae) . Fig. 87.—Amblystegiuni rijiariinn, var. Jiuitans{Br. and Sch.). A, Longitudinal section of the stempassing through a young lateral branch {k) ; h, hair at the base of the subtruding leaf; B, hori-zontal section of a very young leaf, showing the apical cell {jc) ; C, D, transverse sections of youngleaves, showing the development of the midrib. All the figures X 525. part of the leaf shows a group of four cells, those on the outerside being larger than the others. In the former the next wallis a periclinal one and divides the
The structure & development of the mosses and ferns (Archegoniatae) . Fig. 87.—Amblystegiuni rijiariinn, var. Jiuitans{Br. and Sch.). A, Longitudinal section of the stempassing through a young lateral branch {k) ; h, hair at the base of the subtruding leaf; B, hori-zontal section of a very young leaf, showing the apical cell {jc) ; C, D, transverse sections of youngleaves, showing the development of the midrib. All the figures X 525. part of the leaf shows a group of four cells, those on the outerside being larger than the others. In the former the next wallis a periclinal one and divides the cell into an inner and anouter one. From the two inner cells by further division isformed the group of small conducting cells that traverse thecentre of the midrib, while the outside cells together with thoseon the inner side of the midrib become much thickened andserve for strengthening the leaf Here as in Amblystegium thelamina of the leaf remains single-layered, and its cells containnumerous large chloroplasts which, as is well known, continue VII THE BR YINEJ
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Keywords: ., bookcentury1800, bookdecade1890, bookidstructuredev, bookyear1895
