Algal
List
Monday
11/15 and Wednesday 11/17/99
Phylum Chrysophyta - The Golden
Browns, Yellow-Greens, Diatoms
Subphylum Bacillariophyceae
(Diatomaceae)
Order Pennales
Family Fragilariaceae
Diatoma sp. -
bilaterally symmetric, shaped like a cigar or lanced shaped, has a pseudoraphe
(clear line down the middle where ornamentation is absent).
Picture Source: Bowling Green State University
Center for Algal Microscopy and Image Digitization
Subphylum Xanthophyceae -
Order Mischococcales
Family Sciadaceae
Ophiocytium sp. - tube-shaped
cells that have thin, stalk-like appendages, may use these appendages to
attach to the substrate but may also be free-floating, may have balloon
shaped cells at the base.
Picture Source: Ohio University Algal Home Page; Dr.
Morgan Vis
Phylum (Division) Cyanophyta;
Blue-greens
Order Nostocales
-
filaments with heterocysts
Family Rivulariaceae
Calothrix sp.
- filamentous blue-green, heterocysts
(nitrogen
fixing cells) are on the ends (terminal), trichomes often taper at the
ends, may be an epiphyte.
Tapering Calothrix growing epiphytically on another organism
Picture Source: Cyanosite Cyanobacterial Image Gallery
Freeware Purdue University |
Picture Source: Cyanosite Cyanobacterial Image Gallery
Freeware Purdue University
|
Order Nostocales
-
filaments with heterocysts
Family Nostocaceae (unbranched
filaments)
Cylindrospermum sp.
- heterocysts
and akinetes terminal and
at only one end, trichomes do
not taper and may form parallel lines, mucilage
is soft and not always visible.
Larger cells are akinetes, smaller end cells are heterocysts
Picture Source: Cyanosite Cyanobacterial Image Gallery
Freeware Purdue University
|
Terminal heterocysts present only
Picture Source: Cyanosite Cyanobacterial Image
Gallery Freeware Purdue University
|
Order Chroococcales -solitary
cells, aggregations and colonies
Family Chroococcaceae
Gloeocapsa sp. - cells
are aggregated and covered by multi-layered mucilage, a palmelloid formation
(non-flagellated cells in a common mucilage)
Picture Source: Ohio University Algal Home Page; Dr.
Morgan Vis
Order Chroococcales -solitary
cells, aggregations and colonies
Family Chroococcaceae
Microcystis sp. - spherical
shaped cells in a mucilaginoussheath,
can be hundreds of cells in one sheath, have gas vesicles for buoyancy
that make it often appear blackish blue, commonly associated with algal
blooms and fish kills, produce toxins affecting mammals, fish, and birds.
Microcystis sp. colony
Picture Source: Cyanosite Cyanobacterial Image
Gallery Freeware Purdue University |
Microcystis sp. bloom in freshwater lake
Picture Source: Cyanosite Cyanobacterial Image
Gallery Freeware Purdue University |
Order Oscillatoriales
- filamentous without heterocysts
Family Oscillatoriaceae
Phormidum sp. - no
heterocysts, trichomes have a
thin, gummy sheath that often extends
past the trichome, symbiotic with sponges, also found in mats under
ice in Antarctic Lakes
Picture Source: Ohio University Algal Home Page; Dr.
Morgan Vis
Order Oscillatoriales
Family Stigonemataceae
Stigonema (Fischerella)
sp. - no heterocysts, trichomes
have a thick, mucilagenous, sheath
(shown in figure below), has true branching (see below). Compare
to false branching of Scytonema
sp.
Picture Source: Botany 331 Home Page:Dr. Sam Rushforth
/ Dr.Jack Donaldson
Brigham Young University
Phylum Chlorophyta - The
Greens
Subphylum Chlorophyceae
Order Ulotrichales - unbranced,
filamentous algae
Family Microsporaceae
Microspora sp. - unbranched
filaments, cells have overlapping H-shaped wall pieces, make akinetes.
Image server down will post picture ASAP
Subphylum Chlorophyceae
Order Ulotrichales - unbranced,
filamentous algae
Family Ulotrichaceae
Ulothrix sp. - unbranched
filaments, chloroplasts are C-shaped, reproduces by vegetative
reproduction, zoospores, and
isogamy.
Picture Source: Ohio University Algal Home Page; Dr.
Morgan Vis
Order Chaetophorales
Family Chaetopharaceae
Stigeoclonium sp. - has
heterotrichy, but basal cells (that attach to the substrate) are not obviously
different, increases branched under low nutrien conditons, reproduction
by flagellated zoospores (4 flagella per zoospore)
Picture Source: Ohio University Algal Home Page; Dr.
Morgan Vis
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