Piante e loro modi in Sud Africa . cockening- {a) Non formando modelli- Collenchima, angoli ispessiti, non ligati con contents.Parenchima- cellule Sclerotiche, uniformemente ispessite, ligeificate senza contents.parenchima murata Spessa, uniformemente ispessite,trattenenti contents.Prosenchima- Sclerenchima, uniformemente ispessite, ligeificate,senza contenuti{b) Formare modelli Parenchima con semplici fosse presenti in legno, filoem, corteccia, pith.Prosenchima e vasi, formando anelli, spirali, fosse semplici e delimitate; si trova in legno; intracheae e trachoidi. Cellule e Tessuti 69 w 4. Per quanto riguarda la fusione: [A) Senza

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Plants and their ways in South Africa . ckening— {a) Not forming patterns— Collenchyma, angles thickened, unlignified with contents.Parenchyma— Sclerotic cells, uniformly thickened, lignified without contents.Thick walled parenchyma, uniformly thickened, retaining contents.Prosenchyma— Sclerenchyma, uniformly thickened, lignified, without contents.{b) Forming patterns— Parenchyma with simple pits found in wood, phloem, cortex, pith.Prosenchyma and vessels, forming rings, spirals, simple and bordered pits; found in wood; intracheae and tracheids. Cells and Tissues 69 w 4. As to fusion— [a) Without protoplasmic contents and with markings—Vessels, end fusion complete, found in wood, conveying transpiration current and air.With protoplasmic contents without markings—Sieve tubes, ends perforated, found in phloem, carrying elaborated food.Latex vessels, end fusion complete, forming anetwork, found in various parts, carrying latex.All of the cells mentioned here except latex tubes may befound in the oak stem (Fig. 72).. Fig. 70.—Cell structure. A, young parenchymatous cells ; p, protoplasm ;k, nucleus ; kk, nucleolus ; B, older cells showing vacuoles ; j in C, the vacuoleshave become larger; y, the protoplasm has withdrawn from the wall and thecell will become inactive. 5. As to contents— A typical cell has {a) Protoplasm consisting of cytoplasm with outer layer, ectoplasm. inner layer, endoplasm. nuclear membrane, kinoplasm. {b) Nucleus, with nucleolus. yo Plants and their Ways in South Africa rChloroplastids.if) Plastids Leucoplastids. [Chromoplastids.{d) Cell sapCells may contain Water and food material. Air. Reserve food Non-nitrogenous f Starch, Sugar, Inulin, Carbohydrates - - and other less familiarFatty oils. I carbohydrates NitrogenousProteids.Amides.Latex which may contain tannin, proteids, fats, and starch.Excreted, waste or by-products (probably)Mineral matter.Ethereal oils and resins.Tannin.Enzymes. CHAPTER IX. STEM AND ROOT STRUCTURES. A.

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1910
• booksubjectplants
• bookyear1915