CHASSE 19 XIIÜܓܥܢܐ Epidermis Cortex (a) 0.4 mm Pericycle Sieve elements haso Endodermis (b) 17-30 Anatomy of fern rhizomes (a) Transverse section of a rhizome of Adiantum, or maidenhair fern, showing the siphonostele. Note the wide leaf gap. (b) Transverse section of part of the vascular region of a rhizome of the tree fern Dicksonia. The phloem is composed mainly of sieve elements; the xylem is composed entirely of tracheids. 0.1 mm

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**Anatomy of Fern Rhizomes**

This educational entry provides insight into the structure of fern rhizomes as seen through transverse sections. Two figures illustrate the vascular anatomy of different ferns.

**Figure (a)** illustrates a transverse section of a rhizome from *Adiantum*, commonly known as the maidenhair fern. This section highlights the siphonostele structure, characterized by its wide leaf gap. The diagram labels several key components:
- **Xylem**: Responsible for water and nutrient transport.
- **Phloem**: Facilitates the distribution of organic compounds.
- **Leaf gap**: A space associated with leaf attachment.
- **Cortex**: The outer layer of the stem.
- **Epidermis**: The outermost cell layer providing protection.

**Scale**: 0.4 mm.

**Figure (b)** shows a transverse section of a rhizome from the tree fern *Dicksonia*. The focus here is on the vascular region, with specific elements labeled:
- **Pith**: The central part of the stem.
- **Phloem**: Comprised mainly of sieve elements.
- **Xylem**: Composed entirely of tracheids, essential for water conduction.
- **Cortex**: Surrounds the vascular tissue.
- **Pericycle**: Involved in root development.
- **Sieve elements**: Essential for food transport.
- **Endodermis**: The inner layer of the cortex which regulates substance flow.

**Scale**: 0.1 mm.

These diagrams provide a detailed view of the rhizome structures, emphasizing the distinct vascular configurations which support the plant’s physiology.
Transcribed Image Text:**Anatomy of Fern Rhizomes** This educational entry provides insight into the structure of fern rhizomes as seen through transverse sections. Two figures illustrate the vascular anatomy of different ferns. **Figure (a)** illustrates a transverse section of a rhizome from *Adiantum*, commonly known as the maidenhair fern. This section highlights the siphonostele structure, characterized by its wide leaf gap. The diagram labels several key components: - **Xylem**: Responsible for water and nutrient transport. - **Phloem**: Facilitates the distribution of organic compounds. - **Leaf gap**: A space associated with leaf attachment. - **Cortex**: The outer layer of the stem. - **Epidermis**: The outermost cell layer providing protection. **Scale**: 0.4 mm. **Figure (b)** shows a transverse section of a rhizome from the tree fern *Dicksonia*. The focus here is on the vascular region, with specific elements labeled: - **Pith**: The central part of the stem. - **Phloem**: Comprised mainly of sieve elements. - **Xylem**: Composed entirely of tracheids, essential for water conduction. - **Cortex**: Surrounds the vascular tissue. - **Pericycle**: Involved in root development. - **Sieve elements**: Essential for food transport. - **Endodermis**: The inner layer of the cortex which regulates substance flow. **Scale**: 0.1 mm. These diagrams provide a detailed view of the rhizome structures, emphasizing the distinct vascular configurations which support the plant’s physiology.
**Educational Content: Plant Rhizomes**

**F. Slide: Dicksonia - Rhizome XS (Text: p. 418)**

1. *This tissue is found growing underground. What type of structure does the XS seem to be? (root, stem, leaf):*  
   - Answer: ______________________

2. *Based on where it is found and the structure, how would you define rhizomes?*  
   - Answer: ______________________

**G. Live Specimen - Chlorophytum**

1. *The horizontal stem with flowers and baby plants is called a _______________*  
   - Answer: ____________________

In this section, we explore rhizomes, a type of plant structure found underground, using samples from the Dicksonia genus. Rhizomes serve critical roles in plant growth and propagation. Additionally, we examine the Chlorophytum, observing its horizontal stems which facilitate new plant growth.
Transcribed Image Text:**Educational Content: Plant Rhizomes** **F. Slide: Dicksonia - Rhizome XS (Text: p. 418)** 1. *This tissue is found growing underground. What type of structure does the XS seem to be? (root, stem, leaf):* - Answer: ______________________ 2. *Based on where it is found and the structure, how would you define rhizomes?* - Answer: ______________________ **G. Live Specimen - Chlorophytum** 1. *The horizontal stem with flowers and baby plants is called a _______________* - Answer: ____________________ In this section, we explore rhizomes, a type of plant structure found underground, using samples from the Dicksonia genus. Rhizomes serve critical roles in plant growth and propagation. Additionally, we examine the Chlorophytum, observing its horizontal stems which facilitate new plant growth.
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