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Adult stem cell Black & White Stock Photos
RMRE0RN6–. An introduction to vegetable physiology. Plant physiology. GEOWTH 313 by permanent change of form. It is the process of passing from the embryonic to the adult condition. We must not assume that every increase of bulk is necessarily growth; for, as we shall see, in growing cells and members there is a constant stretching of the cell or tissue by hydrostatic. FiQ. 135.^PoETioN OF Seotion of Stem or Rush, showing Stellate Tissue of the Pith, with Lauge Intekoellulab Spaces. pressure or turgidity, which can be distinguished from growth by the fact that it can be removed, the result being a cert
RMPG0CD8–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. THE HOMOSPOROUS LEPTOSPORANGIATJi The Embryo 369 To judge from the few rather vague statements made by Rauwenhoff in regard to the embryo, this more nearly re- sembles the typical leptosporangiate type than it does Osmunda. The primary root has a large and definite three-sided apical cell, and the divisions in the segments are very regular. The Adult Sporophyte Poirault (i) and Boodle (3) have made a study of the stem of various species of Gleichenia, which differs a good deal from 0. Fig. 311
RMRDFBPY–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. THE HOMOSPOROUS LEPTOSPORANGIATJi The Embryo 369 To judge from the few rather vague statements made by Rauwenhoff in regard to the embryo, this more nearly re- sembles the typical leptosporangiate type than it does Osmunda. The primary root has a large and definite three-sided apical cell, and the divisions in the segments are very regular. The Adult Sporophyte Poirault (i) and Boodle (3) have made a study of the stem of various species of Gleichenia, which differs a good deal from 0. Fig. 311
RMPG0590–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. vin MARATTIALES 289 The Adult Sporophyte According to Holle (1. c. p. 218) the four-sided apical cell found in the stem of the young sporophyte of Marattia is re- tained permanently, but in Angiopteris this is not the case, as in the older sporophyte a single apical cell is not certainly to be made out. Bower ((11) p. 324) comes to the same conclusion. Fig. 161.—A, Section of the stipe of Angiopteris evecta, natural size; B, section of the rachis of the ultimate division of the leaf of Maratti
RMRDYFHP–. A textbook of botany for colleges and universities ... Botany. Figs. 268-270. — Sporangium of Lyco- podium: 268, section showing a young sporophyl! bearing a superlicial initial cell (one of a transverse row) on its adaxial face near the base; 269, further develop- ment of the initial; 270, division of initial Into primary wall cell (outer) and primary sporogenous cell (inner). — After Bower. Fig. 267. — Cross section of the central region of an adult stem of Lycopodium, showing the inner region of the cortex surrounding the central stele, in which the branches of the xylem mass are irregula
![. Fundamentals of botany. Botany. 148 STRUCTURE AND LIFE HISTORIES nature of an organ, no matter how it may be disguised, is termed the science of form, or morphology. "^ 140. Life History.—Every plant, in the course of its existence, passes through a series of changes in orderly sequence. Like an animal, every plant begins life as a single cell, the egg, or the equivalent of an egg. Except in some of the lower forms, the egg develops into an. Fig. io6.—A fern {Anisosorus kirsutus), showing portion of the stem above ground. embryo, and the embryo matures into an adult. By a series of more Stock Photo](https://c8.alamy.com/comp/RE3710/fundamentals-of-botany-botany-148-structure-and-life-histories-nature-of-an-organ-no-matter-how-it-may-be-disguised-is-termed-the-science-of-form-or-morphology-quot-140-life-historyevery-plant-in-the-course-of-its-existence-passes-through-a-series-of-changes-in-orderly-sequence-like-an-animal-every-plant-begins-life-as-a-single-cell-the-egg-or-the-equivalent-of-an-egg-except-in-some-of-the-lower-forms-the-egg-develops-into-an-fig-io6a-fern-anisosorus-kirsutus-showing-portion-of-the-stem-above-ground-embryo-and-the-embryo-matures-into-an-adult-by-a-series-of-more-RE3710.jpg ". Fundamentals of botany. Botany. 148 STRUCTURE AND LIFE HISTORIES nature of an organ, no matter how it may be disguised, is termed the science of form, or morphology. "^ 140. Life History.—Every plant, in the course of its existence, passes through a series of changes in orderly sequence. Like an animal, every plant begins life as a single cell, the egg, or the equivalent of an egg. Except in some of the lower forms, the egg develops into an. Fig. io6.—A fern {Anisosorus kirsutus), showing portion of the stem above ground. embryo, and the embryo matures into an adult. By a series of more Stock Photo")
RMRE3710–. Fundamentals of botany. Botany. 148 STRUCTURE AND LIFE HISTORIES nature of an organ, no matter how it may be disguised, is termed the science of form, or morphology. "^ 140. Life History.—Every plant, in the course of its existence, passes through a series of changes in orderly sequence. Like an animal, every plant begins life as a single cell, the egg, or the equivalent of an egg. Except in some of the lower forms, the egg develops into an. Fig. io6.—A fern {Anisosorus kirsutus), showing portion of the stem above ground. embryo, and the embryo matures into an adult. By a series of more
RMRDFC95–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. vin MARATTIALES 289 The Adult Sporophyte According to Holle (1. c. p. 218) the four-sided apical cell found in the stem of the young sporophyte of Marattia is re- tained permanently, but in Angiopteris this is not the case, as in the older sporophyte a single apical cell is not certainly to be made out. Bower ((11) p. 324) comes to the same conclusion. Fig. 161.—A, Section of the stipe of Angiopteris evecta, natural size; B, section of the rachis of the ultimate division of the leaf of Maratti
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