Types of Fungi

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Topics: Fungus
Lab 4: Fungi

Non-filamentous forms — Single-celled Yeasts
Do an Internet search for a microscopic image of baker’s yeast, Saccharomyces cerevisiae (Ascomycota). Answer the following questions:

1. Do the yeast cells have a definite shape or is there considerable variation?
Yeast cells seem to vary in shape, some look to be more oval and round, although. some slides did show pear and cylinder shapes.
2. Can you detect any subcellular structure? I cannot detect a clearly visible subcellular structure in any of the slides I found. Assuming the nucleus is greatly microscopic it is not visible. 3. Are any of the cells dividing? How do you know? Yes, it appears some of the Saccharomyces cerevisiae are dividing. The assumption of the can be observed by a pinching section of what seems to be the parent cell forming a smaller cell daughter cell. Both cells are in close proximity of one another so this can be believed.

Draw some yeast cells in the space provided on the next page.

Filamentous forms – with Hyphae
Do an Internet search for a microscopic image of young hyphae of Morchella (Ascomycota) or some other filamentous fungus. Answer the following questions:

4. Does the hypha have a regular geometric form or is it irregular? The hypha has a regular geometric form,
5. How would you describe the general hyphal structure? What is the general form of a hyphal tip (i.e. tapered, hemispherical, flat, etc.) A long tubular, webbed like mass, interwoven throughout the fungi, it somewhat resembles the artery and vein structures of the human body.
6. Does the hypha appear to be segmented into cells; i.e. are septa (cross walls; singular‑ ‑ septum) present?
Hypha does appear to be segmented into cells. The hypha is divided by a dark looking structure deemed as the septa. The septa are clearly visible in the Hypha of the Filamentous fungus.

Draw some hyphae in the space provided on the next page.

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