Algal List
Monday 11/22 and Wednesday 11/24/99

NOTE SPECIES ON THIS PAGE MAY DIFFER FROM THOSE IN LAB.  USE LAB SPECIMENS ONLY FOR DRAWINGS

Phylum Chrysophyta - The Golden Browns, Yellow-Greens, Diatoms
Subphylum Bacillariophyceae (Diatomaceae)
Order Pennales - bilaterally symmetric diatoms
Family Cymbellaceae
Cymbella sp. - bilaterally symmetrical diatoms, may be found in long, linear colonies, surrounded by mucilage that sometimes anchors Cymbella to the surface, has a pronounced curve on one side, shaped like a cymbal.

Picture Source: Bowling Green State University
Center for Algal Microscopy and Image Digitization
Picture Source: Bowling Green State University
Center for Algal Microscopy and Image Digitization
 


Subphylum Bacillariophyceae (Diatomaceae)
Order Pennales - bilaterally symmetric diatoms
Family Naviculaceae
Navicula sp.- pennate diatom, shape is called naviculoid (rounded poles), has a raphe, in girdle view
is rectangular, valve view is naviculoid.
 
Picture Source: Bowling Green State University
Center for Algal Microscopy and Image Digitization

Order Pennales - bilaterally symmetric diatoms
Family Naviculaceae
Gyrosigma sp. - frustules (cell walls) are s-shaped or sigmoid in valve view, lance-shaped in girdle view, middle of cell looks darker due to criss-crossing of striae.

Picture Source: Bowling Green State University
Center for Algal Microscopy and Image Digitization
Picture Source: Bowling Green State University
Center for Algal Microscopy and Image Digitization

Family Fragilariaceae
Order Pennales - bilaterally symmetric diatoms
Fragilaria sp. - bilaterally symmetric, lanced shaped, has a pseudoraphe (clear line down the middle where ornamentation is absent), in girdle view, has intercalary bands.

Picture Source: Bowling Green State University
Center for Algal Microscopy and Image Digitization
Picture Source: Bowling Green State University
Center for Algal Microscopy and Image Digitization

Phylum Chlorophyta - The Greens
Subphylum Chlorophyceae
Order Zygnematales (Conjugales)
Family Zygnemataceae
Mougeotia sp.- filamentous green, unbranched, distinguished because uses conjugation to
exchange genetic material during when undergoing sexual reproduction, chloroplasts are in a bands or plates and are able to orient themselves toward the light.

Picture Source: Ohio University Algal Home Page; Dr. Morgan Vis

Subphylum Chlorophyceae
Order Zygnematales (Conjugales)
Family Zygnemataceae
Zygnema sp. -  filamentous green, unbranched, distinguished because uses conjugation to
exchange genetic material during when undergoing sexual reproduction, uses rhizoids (root-like structures that DO NOT conduct nutrients) for attachment to substrates, has stellate (star-shaped)
chloroplasts.

Picture Source: Ohio University Algal Home Page; Dr. Morgan Vis		 Left filament showing stellate chloroplasts
Right filament showing two filaments
undergoing conjugation (sexual reproduction)

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