. A textbook of botany for colleges and universities ... Botany. 946 Figs. 945, 946. — Cross sections of leaves of a loose- strife (Lysimachia): 945, a section through a scale leaf, showing a relatively undif- ferentiated mesophyll (m), resembling sponge tissue, and the prominently cutinized lower (outer) epidermis (e); 946, a section through a foli- age leaf, showing a row of conspicuous palisade cells (p), a broken row of shorter palisade cells (p'j, and the sponge tissue (s); figs. 945 and 946 highly and equally Fig. 947. — An inflor- escence bud of the arti- choke (Cynara Scolymus), showin
. A textbook of botany for colleges and universities ... Botany. 946 Figs. 945, 946. — Cross sections of leaves of a loose- strife (Lysimachia): 945, a section through a scale leaf, showing a relatively undif- ferentiated mesophyll (m), resembling sponge tissue, and the prominently cutinized lower (outer) epidermis (e); 946, a section through a foli- age leaf, showing a row of conspicuous palisade cells (p), a broken row of shorter palisade cells (p'j, and the sponge tissue (s); figs. 945 and 946 highly and equally Fig. 947. — An inflor- escence bud of the arti- choke (Cynara Scolymus), showing the overlapping scale leaves (forming an involucre), which protect the delicate flower buds within; the leaves are ar- ranged in many ortho- stichies, illustrating a phyl- lotactic system of high rank. magnified. Scale leaves. — General features. — Scale leaves contain little or no chlorophyll, and hence are not foliage organs; usually they are small yellowish or brownish struc- tures attached to the stem by a broad base, and without prominent veins or leaf teeth; the mesophyll commonly remains undifferentiated through life. Subterranean scale leaves. — Underground stems, at least when young, are clothed more or less thickly with scale leaves. In bulbs the closely imbricated scale leaves are much thickened, making up the main body of the organ; obviously the r61e of such scale leaves is the accumulation of surplus food and water, which commonly are. 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 Coulter, John Merle, 1851-1928; Barnes, Charles Reid, 1858-1910, joint author; Cowles, Henry Chandler, 1869- joint author. New York, Cincinnati [etc] American book company
Size: 1409px × 1772px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1910
