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Journal ArticleDOI

Anatomy of the Dicotyledons.

About: This article is published in American Midland Naturalist.The article was published on 1950-11-01. It has received 2511 citations till now.
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Journal ArticleDOI
TL;DR: The roots of selected water lilies, Nymphaeaceae and Cabombaceae, and water lotuses, Nelumbonaceae, were examined using epifluorescence, brightfield, and modified darkfield microscopy to determine the characteristics of root cortical structure.
Abstract: SEAGO, JR., J. L. (Department of Biology, State University of New York, College at Oswego, New York 13126) The Root Cortex of the Nymphaeaceae, Cabombaceae, and Nelumbonaceae. J. Torrey Bot. Soc. 129: 19. 2002.-The roots of selected water lilies, Nymphaeaceae and Cabombaceae, and water lotuses, Nelumbonaceae, were examined using epifluorescence, brightfield, and modified darkfield microscopy to determine the characteristics of root cortical structure. The members of the Nymphaeaceae have an endodermis usually with Casparian bands only, many astrosclereids and some transverse diaphragms scattered throughout the aerenchyma, and a hypodermis with a uniseriate exodermis with Casparian bands and suberin lamellae, although there may be some secondary, cellulosic thickening. The Cabombaceae are characterized by small roots with an endodermis with Casparian bands and uneven suberin lamellae, aerenchyma without sclereids or diaphragms, and an exodermis with Casparian bands and distinctive suberin lamellae. The Nelumbonaceae are distinctly different: Nelumbo has an endodermis of Casparian bands, suberin lamellae, and secondarily lignified walls, an aerenchyma without sclereids or diaphragms, and a multiseriate hypodermis with a uniseriate exodermis of Casparian bands and suberin lamellae, and an inner hypodermis with distinctly lignified walls.

18 citations

Journal ArticleDOI
TL;DR: Xylem anatomy can be used to support a position for the Alseuosmiaceae in or near the woody Saxifragaceae.
Abstract: The secondary xylem of five species representing all three genera of Alseuosmiaceae was studied. Salient anatomical features that circumscribe the family include narrow vessel ele- ments with many-barred, scalariform perforation plates, pores distributed as a combination of both solitary elements and radial multiples, living septate fibers with stored starch at maturity, and the scarcity or absence of axial parenchyma. An absence of rays characterizes Alseuosmia and Wittsteinia vacciniacea. The insular species, W. balansae from New Caledonia, contains exclusively multiseriate rays that are very wide and tall and composed completely of erect and square cells. The large rays and the occasional scalariform lateral wall pitting of vessel elements of this species are probably best interpreted as paedomorphosis related to the increased size of this plant. The ancestral habit of the family remains unclear since Crispiloba disperma has retained a more primitive xylem structure as evidenced by the occurrence of axial parenchyma and shorter and narrower heterocellular rays. Xylem anatomy can be used to support a position for the Alseuosmiaceae in or near the woody Saxifragaceae.

18 citations

Journal ArticleDOI
01 Dec 1984-Botany
TL;DR: Phytolacca dioica (L.) is characterized by anomalous secondary thickening by means of supernumerary cambia, caused by a change in tissue response to stimuli produced by leaves.
Abstract: Phytolacca dioica (L.) is characterized by anomalous secondary thickening by means of supernumerary cambia. After a period of primary growth and the formation of an initial (normal) vascular cambium, supernumerary cambia are initiated outside of the primary vascular cylinder. The initiation of the first supernumerary cambium takes place through approximately the number of nodes equal to the denominator of the phyllotactic fraction characterizing a given axis. At each node a segment of supernumerary cambium is initiated opposite the leaf traces supplying the leaf inserted at that node. The segments of differentiated cambium arc preceded by regions of obliquely and antielinally dividing cells. In the single juvenile axis studied supernumerary cambial segments also appear above the node to the cathodic side of the entering leaf traces, and opposite the medullary bundle immediately anodic to these traces. Vascular eonnections among the primary and supernumerary vascular cylinders occur between leaf insertions on the same orthostiehy. The levels at which these connections oceur vary among stems. The switch from ordinary to anomalous secondary growth may be caused by a change in tissue response to stimuli produced by leaves.

18 citations

Journal Article
TL;DR: Anatomical investigation of the family Asteraceae (Compositae) growing throughout the Rajshahi Division situated in the northern part of Bangladesh was carried out, finding stomata were found to be present both on the upper and lower surface in 33 species and only onLower surface in 3 species.
Abstract: Anatomical (especially stomata and trichome) investigation of the family Asteraceae (Compositae) growing throughout the Rajshahi Division situated in the northern part of Bangladesh was carried out A total of 36 species under 29 genera of the family Asteraceae were collected and identified Among the recorded species, both anomocytic and anisocytic stomata were found in 21 species; anomocytic stomata in 10 species; anisocytic stomata in 3 species; anomocytic and paracytic stomata were found in 1 species; anomocytic, anisocytic and paracytic stomata were found in 1 species Out of the 36 species, stomata were found to be present both on the upper and lower surface in 33 species and only on lower surface in 3 species Three types of trichomes, ie nonglandular multicellular, non-glandular unicellular and glandular multicellular trichomes were recorded Nonglandular multicellular trichome was found in 25 species, non-glandular unicellular in 1 species and glandular multicellular trichome was found in 1 species Trichomes were absent in rest of the species Anatomical characters are importance for systematic studies

18 citations