The structure & development of the mosses and ferns (Archegoniatae) . hrough the prothallium ; lettering as in the preceding, X300. made at regular intervals to the root-cap, and these layersremain one cell thick, so that the stratification is very the apex of the root there is no separation of dermatogenand periblem, which are first differentiated back of the primary xylem consists of very delicate spiral tracheidsformed at the base of the root at the same time that the firstones appear in the leaf. The foot increases much in size as the leaf and root develop,and its superf
The structure & development of the mosses and ferns (Archegoniatae) . hrough the prothallium ; lettering as in the preceding, X300. made at regular intervals to the root-cap, and these layersremain one cell thick, so that the stratification is very the apex of the root there is no separation of dermatogenand periblem, which are first differentiated back of the primary xylem consists of very delicate spiral tracheidsformed at the base of the root at the same time that the firstones appear in the leaf. The foot increases much in size as the leaf and root develop,and its superficial cells become much enlarged and encroachupon the large cells of the prothallium, whose contents aregradually absorbed by it. The cotyledon is at first composed of compact tissue, which IX MA RA TTIA CE^- ISOE TA CE^ 289 during its rapid elongation separates in places, and forms asystem of large intercellular spaces. There are two rows ofvery large ones, forming two broad air-chambers extending thewhole length of the leaf, but which are interrupted at intervals.
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Keywords: ., bookcentury1800, bookdecade1890, bookidstructuredev, bookyear1895
