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Use of the Key
Synopsis of the Algal Phyla
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akinetes apex apical attached autospores broadly cell showing cell wall Cells arranged cells enclosed Cells oval Cells shaped Cells spherical central chlo chloro Chlorophyta chloroplast Chrysophyta clusters colonial mucilage colorless contractile vacuoles curved dense desmids diameter differentiated disclike discs elliptic elongate end view endospores epiphytic euplankton eye-spot Family Figure filamentous algae flagella flagellum free-floating freshwater front view Frustules fusiform G.M. Smith gelatinous sheath gelatinous strands genera genus girdle view green habit habitats heterocysts intercalary irregularly Kiitz lamellate lobed longitudinal lorica margin microscopic midregion mother-cell wall motile mucilage mucilaginous occur parietal parietal chloroplast Pascher pigments Placoderm plankton plasts platelike poles Presc prostrate protoplast pseudoraphe puncta pyrenoid pyriform radiating raphe rarely rectangular Redrawn reproduction rhizoidal round Scotiella semicell septa setae short side slightly solitary sometimes species illustrated spines spores stalk starch striae substrates tapering thallus trichomes tufts tychoplankton United usually valve view view showing yellow-green zoospores