. The developmental anatomy of Isoetes. Isoetes; Botany. Plate 5 Cytological details in the shoot tip. A, B, and drawing below. Portions of adjacent longitudinal sections from a large apex. The plastids of the superficial layer (A, at UPl) are undiflFeren- tiated and are more condensed in form than those in the cells of the under- lying tissues (A and B, at PI). The cell in A containing the identified mitochondria (M) is drawn below this legend. The mitochondrion identified in the drawing is one of those identified in A. The mitochondria are drawn as they appear in the peripheral cytoplasm, so
. The developmental anatomy of Isoetes. Isoetes; Botany. Plate 5 Cytological details in the shoot tip. A, B, and drawing below. Portions of adjacent longitudinal sections from a large apex. The plastids of the superficial layer (A, at UPl) are undiflFeren- tiated and are more condensed in form than those in the cells of the under- lying tissues (A and B, at PI). The cell in A containing the identified mitochondria (M) is drawn below this legend. The mitochondrion identified in the drawing is one of those identified in A. The mitochondria are drawn as they appear in the peripheral cytoplasm, so that vacuoles are not adequately represented. The length of the mitochondria is manifest. The plastids drawn have a darkly staining reticulum and a lightly staining ground substance. Part of one of these plastids is visible in A (Pi). Both A and B, Regaud's fixation and Regaud's hematoxylin. Both X 1,700. Drawing X 1,500. C, D, E, F. Distribution of starch in the shoot tip is revealed by the PAS reaction. Longitudinal sections. In C and D, starch is absent from the leaf primordia and present in the summital cells of the shoot apex. D is at a higher magnification and shows only the summital cells of C. The starch grains in the summital cells are minute. C, X 500; D, X 880. In E, starch is absent from the leaf primordia and nearly absent from the summital cells of the apex. A few starch grains appear in an adjacent section (not shown) in the summital cells. X 330. In F, starch is present in the leaf primordia but absent from the summital cells of the apex. The starch grains in the leaf primordia are larger than those shown in the apex in D. X 330. M, mitochondrion; PF, periclinal wall in the superficial layer on the flank of the apex; Pi, plastid; UPl, undifferentiated Mitochondrion Nucleus Plastid cf. A. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illust
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectbotany
