. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. MATURE SPOROPHYTE i7 an epidermal layer, with a cuticularised external wall, which prevents indiscriminate loss of water by surface-evaporation. But the epidermis is perforated by numerous stomata, the motile guard-cells of which can control, according to circumstances, the width of the pores leading into the intercellular spaces. There is thus a highly organised ventilating. Ncphrodhim , Rich. Fertile leaf about one-sixth natural size, the lower part with the under surface exposed. To the l
. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. MATURE SPOROPHYTE i7 an epidermal layer, with a cuticularised external wall, which prevents indiscriminate loss of water by surface-evaporation. But the epidermis is perforated by numerous stomata, the motile guard-cells of which can control, according to circumstances, the width of the pores leading into the intercellular spaces. There is thus a highly organised ventilating. Ncphrodhim , Rich. Fertile leaf about one-sixth natural size, the lower part with the under surface exposed. To the left a single fertile segment, enlarged about 7 times. (After Luerssen.) system. Finally, there are also firm, brown, resistant tissues, disposed sometimes near the outer surface, as in the stem and in the leaf-stalk: sometimes more deeply seated, as in the root, while in the leaf they follow the course of the vascular strands. These give to the several parts increased mechanical strength, and power of resistance. Thus constituted the Male Shield Fern is an organism which is capable of leading an independent life on an exposed land-surface: it. 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.
Size: 1338px × 1867px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisherlondonmacmillanand
