Reminder:   Bring the two samples of algae that you collected to lab today! Where to collect algae?

I selected links that provide images of algae similar to those observed in laboratory. Review the links as you prepare for lab and as you study for your lab exam.

Reminder: Bring the two samples of algae that you collected to lab today! Where to collect algae?

In lab you are asked to focus on four things:

1. Sample the diversity of the various Divisions of Algae
2. Select one representative organism from each Division with which you will associate the characteristics of the Division
3. Determine the Division to which each of the two algae you collected belongs
4. Learn the pattern of reproduction of selected Green Algae
• Spirogyra
• Ulothrix
• Oedogonium
• Ulva

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Where to collect Algae

The following locations probably will provide a variety of algal samples. Keep your specimens alive (provide conditions similar to those in which you collected the sample) in a jar, plastic bag, etc. that you keep exosed to light and at a temperature similar to that in which the algae were living.

1. Campus stream -- collect a rock or branch that is covered with green, slimy algal growth.
2. Aquarium - collect a pebble with green growth on it , or scrape green or blue-green growth from the glass
3. Tree bark - collect a fragment of tree bark that has green growth on it. Do not confuse moss plants (they are larger, and appear to have macroscopic leafy structures). In contrast, the algae may appear as a crust.
4. Visit a pond, lake, stream or even a puddle in a local park or near your home and collect some of the "pond scum" floating on the surface, rocks or sticks with green growth on them.
5. Visit the sea shore and collect macroscopic green, brown or red colored plants, which may be floating freely or growing attached to rocks or shells.

Prepare in advance by looking at the examples on the website, illustrations in your text, and illustrations in other reference books.

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Assignment

              Assignment for Laboratory Exercise 10 -- Algae
 

1.   Bring the two algae that you collected to laboratory today.
     Complete page 10-3 and display your specimens at your desk.

2.  Examine the materials on display in the room. These will
     include living and preserved specimens representing
     diversity of algae; type specimens for the divisions we will
     study; live and prepared slides illustrating reproductive
     patterns of selected green algae; information from books and
     journals related to these and to the economic importance of
     algae and the ecological role of algae.

3.   Learn the major characteristics of the following division of
     algae and one organism to represent each division:
     Cyanophyta, Euglenophyta, *Diatoms (Chrysophyta), Rhodophyta,
     Phaeophyta, Chlorophyta.

4.   Examine materials present which illustrate biological
     diversity of the Divisions of algae. Recognize how, despite
     the variation illustrated, each representative meets the
     criteria for the division to which it belongs.

5.   Learn cell structure of the Green Algae Ä Spirogyra,
     Ulothrix, Oedogonium, and  patterns of reproduction of these
     and Ulva.

6.   Show me the items on the check sheet (page 10-2) and have me
     initial that page to indicate that you have shown them to
     me.

 7.   Prepare for a quiz.