Gracilariaceae

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Solieriaceae
Gracilariaceae
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Gracilariaceae
Rhodymeniaceae
Halymeniaceae
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family, ordinal level
flat sp.
vegetative structure cellular medulla
Gracilaria
terete sp.
Hydropuntia
mixed-sized cells
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Solieriaceae (Solieria)
loose filiform, or mixed cellular-filiform
medulla
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Halymeniaceae (Cryptonemia)
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2
1
2
3
1
-cortical unit of 3 surface cells
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-inherently uniaxial
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-uniaxial growth quickly disguised -axial cells
same shape as medullary cells
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Conjunctor cells fuse with neighboring cells,
resulting in secondary pit connection formation
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Generic distinction -comparati
ve post-fertilization events of
female reproductive system in establishment of
cystocarp nature of fusions - complexity of
male reproductive system
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Gracilaria intermedia cystocarps
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pericarp
carposporangia
inner gonimo- blast

medulla
cystocarp floor
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Gracilaria multinucleate tubular nutritive
cells to roof, to base
Gracilariopsis uninucleate conjunctor
cells at base
TAPPING BACK
Hydropuntia multinucleate tubular nutritive
cells at base of cystocarp
Gracilariophila (parasite)
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Gracilaria
Gracilariopsis
in shallow or deep pits
super- ficial
in deep pits, con- necting to vege- tative
cells
Hydropuntia
Gracilariophila
male structures
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ordinal family-level characters -based
on how unfertilized female system develops in
relation to vegetative growth cf. Kylin system
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2
3
1
1
unfertilized female structure
-origin 3-cortical unit again -lower cell of
unit cell 1 supporting cell cutting off
carpogonial branch initial -cells 2 3
nutritive cells of carpogonial branch unit
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unfertilized 2-celled carpogonial branches
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-2-celled carpogonial branch on supporting
cell -straight trichogyne reaching thallus
surface -partly fusion of cortical nutritive
cells to carpogonium
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Partly fusion of neighboring cortical cells with
carpogonium vegetative nuclei remain in unfused
portion
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-diploid zygote nucleus in uninucleate
carpogonium -fused cortical cells nutritive
cells
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-young carpospore-bearing filaments
(gonimoblasts) cut off from carpogonial fusion
cell
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Generic character how
lower cells of young carpospore-bearing filaments
fuse back to multinucleate carpogonial fusion
cell
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young cystocarp Gracilariopsis
-very regular, progressive growth of
carpospore- Bearing filaments
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Fusion of lower carposporophyte cells to
vegetative gametophytic cells
Gracilariopsis
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-lower gonimoblast cell act as conjunctor cells
fusing with gametophytic cells
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Once an interaction has taken place between a
carposporophytic cell and a vegetative cell, the
fruiting body is called a cystocarp rather than
a carposporophyte
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Gracilaria multinucleate tubular nutritive
cells to roof
Gracilariopsis uninucleate conjunctor
cells
Hydropuntia multinucleate tubular nutritive
cells at base of cystocarp
Gracilariophila (parasite)
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Problem differentiate
among stages that are are functional, versus
abortive?? no auxiliary cells!
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Gracilaria male structure development
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Gracilaria male structure development
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Gracilaria male structure development
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Gracilaria male structure development
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Gracilaria male structure development
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Gracilaria male structure development
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Gracilariopsis male structure development
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all genera
-tetrasporangial initials are surface cortical
cells -cruciate divisision of tetrasporangia
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Gracilaria curtissiae
-thick thallus thinner lateral blade-like
proliferations
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Gracilaria intermedia
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Gracilaria intermedia
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Gracilaria cervicornis
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Gracilaria domingensis
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Hydropuntia caudata
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Gracilaria galetensis
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Gracilaria hayi
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