. Contributions from the Botanical Laboratory, vol. 8. Botany; Botany. 123 THE SPIERER LENS. Fig. 6 Micellar structure of wall of elder pith cell seen in surface view (same view as lower half drawing, Fig. 3.) Fig. 7 Striated structure of the dry cellulose wall of a dead onion cell, surface view. Fig. 8 Parallel striations of cellulose wall of onion cell, surface view: note lobbed appearance of striae, the result of a micellar structure which is here less marked than in Fig. 6. Fig. 9 Detail of transverse optical section of vertical walls at junction of three onion cells: the first rod (compou
. Contributions from the Botanical Laboratory, vol. 8. Botany; Botany. 123 THE SPIERER LENS. Fig. 6 Micellar structure of wall of elder pith cell seen in surface view (same view as lower half drawing, Fig. 3.) Fig. 7 Striated structure of the dry cellulose wall of a dead onion cell, surface view. Fig. 8 Parallel striations of cellulose wall of onion cell, surface view: note lobbed appearance of striae, the result of a micellar structure which is here less marked than in Fig. 6. Fig. 9 Detail of transverse optical section of vertical walls at junction of three onion cells: the first rod (compound micelle) from the junction in the tail of the " Y", is $tx, the second, 3/i, and the third long; the total thickness of a vertical wall, consisting of four striae, is 3m (see Fig. 5 c for drawing of this same view) WILLIAM SEIFRIZ 124 the presence of short rods in the cellulose, is lacking (Figs. 7 and 8), though often the same cell may show continuous striae in one region (Fig 4) and di«< continuous ones in another region (Fig. 5, c). Furthermore, though separate rods are sometimes not present and the striae are unbroken lines yet such striae are nearly always lobbed or undulating, as if built of distinct n-irticles (Fig. 8). *• ' The striae average from to ^ in thickness. The rod-shaped particles which build up the striae, vary in size, though they average rather close to i or 2M in length; some, however, are two or three times this size, and some are no longer than broad (). The longer ones are probably, like the long un- broken striae, built up of several unit particles. The i/x rod-shaped units are not of the order of magnitude which Nageli had in mind when he gave us the term micellae. The units of these stiae are super-micelles. A striated appearance in the cellulose walls of plant cells is no new ob- servation. Strasburger^ in 1882, pictured fine striations in the walls of plant cells. These markings are visible with an oil-immersion
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