Shoot Gross Anatomy Flashcards
stems & leaves distinct regions
epidermis vascular bundles cortex pith mesophyll
arrangement in stems is based on…
which is referred to as…
arrangement of vascular tissues
a stele
4 arrangements of vascular tissues
protostele
siphonostele
eustele
atactostele
most basal vascular bundle
protostele
protostele arrangement
& also have
central “bundle” with xylem & phloem
& also have cortex & epidermis
who has protostele arrangement?
one phylum (lycopodiophyta) & one class of ferns (whisk ferns)
siphonostele arrangement
& also have
ring of vascular tissues surrounding the pith (phloem surrounding xylem)
& also have cortex, epidermis, & pith
who has siphonostele arrangement?
only in ferns and their relatives
“eustele” =
“true stele”
eusteles have
thinner cortex
epidermis
wider pith
individual vascular bundles
eusteles evolved
prior to seed plants (most basal seed plant had eustele)
atactosteles primarily in
monocots (one group of flowering plants)
atactostele arrangement
vascular bundles appear “scattered” but are really ordered
usually more bundles near epidermis (some cases they are larger net center of the stem)
atactosteles have
no definitive pith or cortex (spaces in between bundles = ground tissue)
no monocots produce
wood
