Water Molds and Simple Fungi Oomycota, Chytridiomycota, Zygomycota EKU General Botany Lab.
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Transcript of Water Molds and Simple Fungi Oomycota, Chytridiomycota, Zygomycota EKU General Botany Lab.
Water Molds and Simple FungiOomycota, Chytridiomycota, Zygomycota
EKU General Botany Lab
Saprolegnia (Oomycota)
oogonium witheggs inside
antheridialhyphae
vegetative hyphae(2n and coenocytic)
Saprolegnia reproductionSexual Asexual
Zoosporangium
(resistant zygote)
(Antheridia and antheridial hyphae arebasically interchangeable terms.)
Phlyctochytrium
mycelia
a ‘holocarpic’ chytrid
rhizoidal hyphae
Allomyces a filamentous chytrid
coenocytic hyphae
Is this the sporophyte (2n) phase, or the gametophyte (n) phase?
resistantsporangia(meiosporangia)
mitosporangia
The true colors of this organism have beengreatly distorted by thetechnique used to make the permanent slide fromwhich this photo wastaken. (See the nextslide.)
The last slide was of preserved material.Here is a better slide--of living material.
This is the diploid (2n) phase of Allomyces. All of the sporangia in this photo are resistant meiosporangia. No thin-walled mitosporangia are visible.These resistant sporangia eventually will detach and float to the bottom. As springarrives, meiosis will occur inside the sporangia and they will release haploid (n) meiozoospores.
photo by Ross Clark
Allomyces gametangia
In Allomyces, the male and female gametangia usually occur in pairs, with one sexabove the other. In the picture above, you can see the brownish male gametangia abovethe clear female gametangia. The female gametangia have already released their gametes.The bright white spots are the exit papillae where the female gametes left the gametangia.
photo by Ross Clark
Rhizopus nigricans (Zygomycota)Black Bread Mold
Mycelium (coenocytic)
Sporangium
Columella
Sporangiophores
Rhizoids
Spores
Rhizopus nigricans reproduction(Zygomycota)
suspensor
suspensor
asexual phase
sexual phase
diploid
Some chytrid pictures
chytrid ondiatom
a holcentric chytridMore chytrids!
Polymyxa, a chytrid-like organism,but not a chytrid (has 2 anteriorwhiplash flagella)
Diagram of chytridzoospore; one posteriorwhiplash flagellum
chytrids on spirogyra cell
Don’t forget – some chytrids, such as Allomyces, have filamentous hyphae.