Algal List
Monday 11/29/99 and Wednesday 12/1/99

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 Centrales - radially symmetric diatoms
Family Coscinodiscaceae
Melosira sp. - a centric diatom, arranged in filaments, frustules do not have intercalary bands, cell walls punctate (having a thin spot in the walls), a primary component of marine plankton.

Picture Source: Botany 331 Home Page:Dr. Sam Rushforth
/ Dr.Jack Donaldson Brigham Young University
Picture Source: Ohio University Algal 
Home Page; Dr. Morgan Vis


Subphylum Chrysophyceae
Order Ochromonadaceae - colonies of flagellated cells
Family Dinobryaceae -
Dinobryon sp. - a colonial algae, cells are in a lorica which are stacked on top of each other, has two unequal flagella.

Picture Source: Botany 331 Home Page:Dr. Sam Rushforth / Dr.Jack Donaldson
Brigham Young University

Subphylum Chrysophyceae
Order Ochromonadaceae - colonies of flagellated cells
Family Synuraceae -
Synura sp. - each cell has two flagella and two parietal chloroplasts, cells form a spherical colony that is NOT in a mucilagenous sheath

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

Phylum Chlorophyta - The Greens
Subphylum Chlorophyceae
Order Zygnematales (Conjugales)
Family Desmidicaeae
Closterium sp. - a desmid; has two semicells but no constriction in the middle, each semicell has its own chloroplasts, cells are crescent to lance-shaped.

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

Subphylum Chlorophyceae
Order Zygnematales (Conjugales)
Family Desmidicaeae
Staurastrum sp. - a desmid; cells are deeply constricted in the middle of the cell, cells are triangular or flattened triangular (see below) in overall shape.

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

Order Chlorococcales
Family Chlorococcales
Family Hydrodictaceae - organized colonial cells
Pediastrum sp. - cells are arranged radially, outer cells form spine-like extensions of the colony, cell is coenocytic.

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

Subphylum Chlorophyceae
Order Chlorococcales
Family Scenedesmaceae - colonial cells in groups of 2 to 4, may bear spines
Scenedesmus sp. - forms a coenobium (a colony that always has the same number of cells once it's formed), four cells to a coenobium (can vary), reproduction by autospores.

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

Phylum Cyanophyta - The Blue Greens
Order Oscillatoriales - filamentous without heterocysts
Family Oscillatoriaceae
Oscillatoria sp. - filamentous blue-green, no definate sheath (compare to Lyngbya sp. ), do not have akinetes or heterocysts, produces new cells on the ends of the filament, when a fileamnet brekas in half, two new filaments grow (vegetative reproduction), grows in mats (see figure on the right).

Picture Source: Cyanosite Cyanobacterial Image Gallery Freeware Purdue University

Picture Source: Cyanosite Cyanobacterial Image 
Gallery Freeware Purdue University

Phylum Rhodophyta - The Reds
Order Bangiales - unbranched filamentous algae
Family Goniotrachaceae
Asterocystis sp. - a false-branched, each cell is oblong to oval in shape, red algae; blue, star-shaped chloroplasts, see Rhodophyta characteristics.
NO IMAGE AVAILABLE

 

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