. The structure and development of mosses and ferns (Archegoniatae). Fig. so.—Porella Bolanderi. A, Median longitudinal section of a vegetative axis;B, a cross-section of the apex of a similar one, X500; x, the apical cell; h, hair;d, dorsal surface; v, ventral surface; C, male; D, female branch. lamellae which remain single-layered, and undergo but littlefurther modification beyond an increase in size. From thebase of the young leaves simple hairs develop, but remain smalland inconspicuous. The inner of the three first formed cellsof the segment, by further division and grow^th in all direc-t
. The structure and development of mosses and ferns (Archegoniatae). Fig. so.—Porella Bolanderi. A, Median longitudinal section of a vegetative axis;B, a cross-section of the apex of a similar one, X500; x, the apical cell; h, hair;d, dorsal surface; v, ventral surface; C, male; D, female branch. lamellae which remain single-layered, and undergo but littlefurther modification beyond an increase in size. From thebase of the young leaves simple hairs develop, but remain smalland inconspicuous. The inner of the three first formed cellsof the segment, by further division and grow^th in all direc-tions, produces the axis of the plant. This in cross or longi-tudinal section shows almost perfectly uniform tissue. Nodistinct epidermis, or central strand, like that found in mostMosses, can be seen. I04 MOSSES AND FERNS chap; The branching is monopodial and the branch representsthe ventral lobe of a leaf. After the first division by whichthe two lobes of the leaf are separated, only the dorsal onedevelops into the lamina of the leaf, which is thus in the seg-m
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Keywords: ., bookauthorcampbelldouglashought, bookcentury1900, bookdecade1910
