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Evolution of vascular tissue, mosses utilize hydroids, Lepotids and…
Evolution of vascular tissue
From nonvascular to vascular tissue
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Hydroids:
started with simple water conducting cells
similar to tracheids
lack lignin and secondary wall thickening
difference of hydroids of bryophytes and vessels of tracheophytes
bryophyte polymers are not cell-specific
hydroids collapse during water stress
hydroids lack secondary wall patterns
Leptoids
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simple parenchyma specialized into leptoids
similar to phloem sieve cells
nearly identical to protophloem cells of certain tracheophytes
Mosses
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no true vascular tissue
vasculature has already begun
Sterids
elongate, thick-walled, slender, and fiberlike cells
Lycophytes
also known as spike mosses
quillworts
Most of the extant species are tropical
earliest group with true vascular tissue
Monilophyta
a diverse group
horsetails
whisk ferns
ferns
Well developed vascular tissue
found throughout the monilophytes
mosses utilize hydroids
Lepotids and Sterids have thing in common
Monilophyta were the first to develop this tissue
