The sequence of structures in a penicillus of Penicillium digitatum shall be

Options

A. Conidiophore `rarr` Rami `rarr` Phialides `rarr` Metulae `rarr` Conidia
B. Conidiophore `rarr` Rami `rarr` Metulae` rarr` Phialides `rarr` Conidia
C. Ramus `rarr` Conidiophore` rarr` Metulae `rarr` Phialides `rarr` Conidia
D. Metulae `rarr` Rami `rarr` Conidiophore `rarr` Phialides `rarr` Conidia

Answer

To answer the question regarding the sequence of structures in a penicillus of Penicillium digitatum, we will follow these steps:

### Step 1: Identify the Initial Structure
The first structure in the sequence is the **Cornidiophore**. This structure arises from the hyphae of the fungus and serves as the main stalk from which other structures develop.

### Step 2: Understand the Branching Structures
The Cornidiophore produces branches known as **Remy**. These branches are irregular in shape and do not have a definite structure, which is characteristic of the Remy.

### Step 3: Further Branching
From the Remy, additional branches are formed called **Metule**. Each Remy can produce around 15 to 30 Metule branches.

### Step 4: Identify the Flask-Shaped Structures
At the distal end of the Metule, we find structures known as **Phyllites**. These are flask-shaped and play a crucial role in the reproductive process of the fungus.

### Step 5: Final Structure - Spores
Finally, the Phyllites bear the **Cornidia**, which are the spores of the fungus. These spores are crucial for the reproduction and dispersal of Penicillium digitatum.

### Final Sequence
Thus, the correct sequence of structures in a penicillus of Penicillium digitatum is:
1. Cornidiophore
2. Remy
3. Metule
4. Phyllites
5. Cornidia