The American botanist and florist; including lessons in the structure, life, and growth of plants; together with a simple analytical flora, descriptive of the native and cultivated plants growing in the Atlantic division of the American union . true absorbents, the 7nouths of the growingplant. 429. The microscope shows that the ex-treme, advancing point of the delicate, grow-ing fibres is not thrust naked against theopposing soil, but is covered with a capcalled piLEOKHizA (pileus, a cap, r/iiza, root),Avhich consists of older, hardened cells, be-hind which are formed the new cells. Inthe Duck
The American botanist and florist; including lessons in the structure, life, and growth of plants; together with a simple analytical flora, descriptive of the native and cultivated plants growing in the Atlantic division of the American union . true absorbents, the 7nouths of the growingplant. 429. The microscope shows that the ex-treme, advancing point of the delicate, grow-ing fibres is not thrust naked against theopposing soil, but is covered with a capcalled piLEOKHizA (pileus, a cap, r/iiza, root),Avhich consists of older, hardened cells, be-hind which are formed the new cells. Inthe Duckmeat, the pileorhiza is lengthenedinto a sheath. 480. The manner of growth in the root is not like that of stems, by the extension ofparts already formed, but simply by the addition of new matter at the advancing accounts for the wonderful facility with Avhich it penetrates the soil and fincis itsway uninjured into the hardest earth. 431. Structure of Leaves. The leaf may be regarded asan expansion of the two outer integuments of the bark, or of thegreen bark and the epidermis, expanded into a broad, thin sur-face by a woody framework proceeding from the medullarysheath and the liber. The framework of veins is therefore fibro. .515, Extremity of the rootlet of Maple, withflbrillie and (,s) pileorhiza. 516, Two plants ofLemna minor (Duckmeat)—s, their pileorhiza. THE LIGNEOUS SYSTEM. 139 vascular, abounding in spiral vessels, and strengthened withliber. 432. The parenchyma exists in two strata, more or less dis-tinct. In all those leaves which are ordinarily horizontal inposition, one surface being upward and the other downward,these two layers are dissimilar; but in leaves with a verticallamina (Iris), and in Phyllodia (§ 321), the two layers are similar.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1870
