These high quality algal strains are cultured under rigidly controlled conditions. We offer a varied selection of these fascinating organisms, from those structured like bead-like filaments and geometrically arranged cells to biflagellates and desmids. Enough for 30 students. After ordering living organisms, a pre-paid post card for each item will be sent to you so that you can receive your item when you need it. Simply fill out the pre-paid post card with the arrival date of a Wednesday, Thursday or Friday, and then drop the card in the mail. Please allow 3 weeks lead-time from the time we receive your order.