浙江大學20xx植物學甲課件第04次課2008第51到-資料下載頁
2025-05-01 05:13本頁面
【正文】 ular structure belongs to protostele, phloem surrounding the exylem. 維管結(jié)構(gòu)簡單， 屬于原生中柱， 韌皮部圍繞木 質(zhì)部。 2. Equisetum 木賊 The center of the pith is torn apart, Forming a pith canal. 髓的中央中空， 形成一個髓 腔。 接近單子葉 . 內(nèi)皮層 胞間道 維管束 Reconstructure of a carboniferous period swamp forest 石炭紀沼澤森林景觀重建 3. Diphasiastrum 石松類 A protostele, showing xylem and phloem. Note the large air spacers in the cortex. 原生中柱，表明木質(zhì)部和韌皮部。注意在皮層中的大量氣腔。 No pith 3. Diphasiastrum 石松類 3. Selaginella 卷柏類 The protostele is suspended in the middle of the hollow stem. Note the trabeculae ( endodermal cells) 原生中柱懸在中空莖的中央，注意內(nèi)皮層細胞 4. Fern 真蕨類 Tree fern, Dicksonia, 樹蕨維管束 Adiantum， 鐵線蕨 Have the different protostele. 真蕨有不同的原生中柱。 4. Fern 真蕨類 Have the different protostele. 真蕨有不同的原生中柱。 The xylem forms a plete ring In many ferns. Phloem occurs on both the exterior and interior of the xylem Section 4 Morphology, structure and development of leaves 第四節(jié) 葉的形態(tài)、結(jié)構(gòu)及生長發(fā)育 Leaves, the lateral ans of a shoot, typically have a moreorless flattened form, and a dorsiventral （背腹面） structure. The upper (or adaxial，近軸） and lower (abaxial，遠軸 ) sides of the leaf with respect to the stem are easily distinguished. In most plants, leaves are dorsiventral in their internal structure.
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