Filamentous Fungi (Molds) – Fungi

by Vincent Racaniello, PhD

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    00:02 We talked previously about how some fungi make spores within a sac, it's called an ascus, the other type of fungi produce spores from a structure called the basidium. And on the left, we see a typical yeast or fungal mycelium. And the very top, there are spores coming off the mycelium and that is a basidium. The spores come off and generate new fungi. And on the right is a close-up diagram of the basidium, and at the very tip the fungi produce spores, those are then released and fall into the environment to generate new organisms.

    00:39 Fungi typically live in soil or on dead matter, you often can't see them. If you just go for a walk in the woods, the soil is teeming with fungi, but you don't even see them. I think even in a city if you walk around there is plenty of fungi growing in damp places and they're just so small that you don't notice them, but they're there and you're inhaling them quite frequently. I'm sure you have had some rotting fruit in your refrigerator or on the table in your kitchen, that green growth or white fuzzy growth on the surface of the fruit, that is a mold, it's a filamentous fungus and these are growing and they're using nutrients from the fruit and they're producing spores. So if you can see an orange that looks like this one, you're breathing in the spores.

    01:35 Now remember the mycelia that fungi produce, these are large meshworks or networks of filaments that spread and spread and spread and these typically grow in the soil and periodically they produce mushrooms which pop above the soil to release their spores. These mycelia can be small or they can be very big. So the mycelium on the orange that we just looked at is relatively small, but some of these mycelia are miles in diameter. For example there is a site in Oregon in the US, it's a 2,400 acre site which is about 9.7 km², it has a single contiguous growth of mycelium. It's one organism that started from a spore and just kept growing and growing and growing. You can't see this, it's going in and under the soil, but periodically the mushrooms come up from the mycelium and they drop of course their spores. So we think this might be the world's largest organism, miles in diameter.

    02:44 Just to review the two different ways that fungi produce spores. They produce them from a basidium and these are called basidiospores and this is typical of the fungi called basidiomycetes, or the fungi can produce spores within a sac called an ascus, the spores are called ascospores and these fungi are called ascomycetes.

    About the Lecture

    The lecture Filamentous Fungi (Molds) – Fungi by Vincent Racaniello, PhD is from the course Microbiology: Introduction.

    Included Quiz Questions

    1. Production and dispersal of spores
    2. Digestion of nutrients
    3. Absorption of light
    4. Excretion of waste
    1. A mesh of filaments
    2. A defensive layer of chitin
    3. A structure for light absorption
    4. A structure for the excretion of waste
    5. A mechanism for spore production and dispersal

    Author of lecture Filamentous Fungi (Molds) – Fungi

     Vincent Racaniello, PhD

    Vincent Racaniello, PhD

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    explains cleary
    By Neuer N. on 16. October 2017 for Filamentous Fungi (Molds) – Fungi

    i will recommend this lecture on this topic because i was failling to undestand but after this tutorial i am confident