Name the membranous covering protecting the sporangia in Dryopteris .

Answer

**Step-by-Step Solution:**

1. **Identify the Plant Type**: Understand that Dryopteris is a type of fern. Ferns are part of the plant kingdom and are known for their unique reproductive structures.

2. **Understand Sporangia**: Recognize that sporangia are structures where spores are produced. In ferns, these sporangia are often grouped together in clusters known as sori.

3. **Membranous Covering**: Learn that the sporangia in Dryopteris are protected by a membranous covering. This covering is crucial for protecting the sporangia from external environmental factors.

4. **Name the Covering**: The specific name of the membranous covering protecting the sporangia in Dryopteris is called the **Stromium**.

5. **Function of Stromium**: Understand that the stromium not only protects the sporangia but also plays a role in the dispersal of spores when they mature and are released.

6. **Characteristics of Stromium**: Note that the stromium is typically thin-walled and may exhibit annulus markings at the margins, which help in identifying the edges of the spores.

**Final Answer**: The membranous covering protecting the sporangia in Dryopteris is called the **Stromium**.

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