For this lab, I would recommend bringing in some moldy cheese or bread, getting some fungi off the trees on campus (especially lichens, which are plentiful), and buying some portabella mushrooms at the store. You can show how a mushroom opens up like an umbrella, and leaves a ring of tissue where the cap tears loose from the stipe (the annulus). Check the store for some good samples of small mushrooms where the stipe and the pileus are still attached or partially attached. Knocking the mushrooms on a piece of paper releases the spores, and there's a good sample of woody, tough shelf fungus to show them. Demonstrate how it lives from year to year, and can't have gills. Toadstools and mushrooms only last a few days to distribute spores, so they make gills even though the gills make them dry out quickly. A shelf fungus lives for years, so it has small openings to drop spores through and reduce water loss. Point out how the chitin (like insect shells) and glycogen (how animals store sugar) have revealed that fungi are more closely related to animals than to plants.