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Bio Lab Wksht & HW Questions 81

Bio Lab Wksht & HW Questions 81 - and rusts and...

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76 Sordaria is an example of a fungus that has a type of ascocarp called a perithecium . Remove some perithecia from the fresh culture provided and place them on a microscope slide. Add a drop of water and a coverslip and gently press down with your thumb to release asci from the ascocarps. Sketch your observations. Examine prepared slides and locate the perithecia using the 40X objective lens. Look for the ostiole (pore). Sketch and label a diagram. What shape are the asci? How many ascospores per ascus can you see? How many do you expect? The cup fungus Peziza provides an obvious example of an apothecium . Examine prepared slides of the apothecium in longitudinal section (use the 40X objective lens) and make drawings illustrating what you see. Locate the layer of asci and the sterile paraphyses . Examine the demonstration of the whole organism under the dissecting microscope. D. Phylum Basidiomycota: This phylum includes the fungi you are probably most familiar with: the puffballs, mushrooms, bracket fungi,
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Unformatted text preview: and rusts and smuts. Members have septate hyphae, but the septa are perforated and surrounded by bracket-like structures. Unlike other fungi, most reproduction is sexual. Meiosis produces basidiospores , which are borne on a club-shaped structure called a basidium (plural; basidia). Basidia are located on or in a complex structure called a basidiocarp . What type of life cycle is exhibited by these organisms? The two classes in this Phylum that we will examine today are defined based on the relationship between basidia and basidiocarp. Note that class names within the fungi end in “ mycetes ”. D-1. Class Hymenomycetes: This class contains the gill fungi (mushrooms) and the pore fungi (bracket fungi). Agaricus bisporus, the commercial mushroom, is an example of a gill fungus. In Class Hymenomycetes, the basidia and basidiospores are borne on a basidiocarp....
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