1118 - November 18, 2011 Lecture 4 1. division Monilophyta...

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November 18, 2011 Lecture 4 1. division Monilophyta a) includes the seedless descnendants of a common ancestor with megaphylls 2. order psilotales a) Psilotum has photosynthetic stems and underground rhizomes b) the gametophyte is tiny and non-photosynthetic (fungi provide it with nutrients) c) the gametophyte remains below soil surface (produces antheridia and archegonia) 3. order equisetales a) sporophyte is dominant b) gametophyte is tiny and remains at soil surface c) whorled stem arrangement d) reduced scale-like leaves, photosynthetic stems e) many have silica in their cell walls f) strobilus (cone-like structure) produces sporangia → haploid spores g) homosporous life cycle h) so unusual, that they were once classified into their own division: Sphenophyta i) have whorled, photosynthetic stems (multiple stems emerge from a single node, or point of attachment, on the stem) j) stem with a strobilus and a sporangiophore (umbrella-like structure) k) strobilus is composed of sporangiophores bearing multiple sporangia the sporangia produce a single type of spore (homosporous) l) horsetail spores are wrapped with hygroscopic elaters, which extend and contract with
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This note was uploaded on 12/07/2011 for the course EEMB 3 taught by Professor Carlson during the Fall '08 term at UCSB.

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1118 - November 18, 2011 Lecture 4 1. division Monilophyta...

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