Lab 10

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Lab 10

• Lycophyta, Psilotophyta

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Vascular plants

• General features of the land plants
• Common name Vascular plants
• Synonyms Tracheophyta
• Growth habit Multicellular stems, leaves, and
  roots thalloid gametophytes
• Undulipodia (flagella) Whiplash (2 to 1000)
• Conductive cells Sieve cells, forming phloem
  (food), and tracheids, forming xylem (water)

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Vascular plants

• Clonal reproduction Vegetative, various
  multicellular propagules
• Sexual reproduction Homosporous or heterosporous
• Included Phyla Lycophyta, Psilotophyta,
  Sphenophyta, Pterophyta, Cycadophyta,
  Ginkgophyta, Coniferophyta, Gnetophyta,
  Anthophyta
• Recognized by Free-living, branched Sporophytes
  xylem

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Tetrads
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Lycophyta

• General features of the vascular plants
• Common name Club mosses (applies also to the
  Class Lycopodiopsida)
• Synonyms None
• Sporophyte growth habit Stems, leaves, roots
• Gametophyte growth habit Photosynthetic or
  parasitic thalli

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Lycophyta

• Stele Protostele
• Undulipodia (flagella) Two or more whiplash
• Sexual reproduction Homosporous or heterosporous
• Representative genera Isoetes, Lycopodium,
  Selaginella
• Recognized by Meiosporangia on upper surfaces of
  sporophylls

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P Lycopodium
Lycophyta Lycopodiopsida
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A Lycopodium stem
Lycophyta Lycopodiopsida
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A Lycopodium strobilus
Lycophyta Lycopodiopsida
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P Selaginella
Lycophyta Selaginellopsida
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D Selaginella resurrection plant
Lycophyta Selaginellopsida
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A Selaginella sporeling
Lycophyta Selaginellopsida
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D Selaginella strobilus
Lycophyta Selaginellopsida
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A Selaginella strobilus
Lycophyta Selaginellopsida
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D Isoetes
Lycophyta Isoetopsida
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D Isoetes megaspores and microspores
Lycophyta Isoetopsida
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Psilotophyta

• General features of the vascular plants
• Common name Whisk ferns
• Synonyms Psilophyta
• Sporophyte growth habit Stems
• Gametophyte growth habit parasitic branching
  thalli

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Psilotophyta

• Stele Protostele
• Undulipodia (flagella) Two or more whiplash
• Sexual reproduction Homosporous
• Representative genera Psilotum, Tmesipteris
• Recognized by No leaves or roots dichotomous
  branching synangia

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P Psilotum
Psilotophyta
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D Psilotum rhizomes
Psilotophyta
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A Psilotum rhizome
Psilotophyta
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A Psilotum meiosporangium
Psilotophyta
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Appearances can be deceiving