-
vascular system. Such an
arrangement is
termed a
protostele.
There are
usually three basic types of
protostele:
haplostele –
consisting of a
cylindrical core...
- the
classical concept of a microphyll, the leaf vein
emerges from the
protostele without leaving a leaf gap. Leaf gaps are
small areas above the node of...
- than
terminal sporangia (often kidney-shaped or reniform), and
exarch protosteles, in
which the
protoxylem is
outside the
metaxylem rather than vice versa...
- more but has no
apparent leaves. The stem has a core of thick-walled
protostele in its
centre surrounded by an
endodermis which regulates the flow of...
-
morphological development as the
plant grew. The
young trunk began as a
protostele in
which the
outer xylem matured first (exarch), but the
later and higher...
- erythropus). The
vascular steles are
polystelic protosteles. Stem
section shows the
presence of more than two
protosteles. Each
stele is made up of
diarch (having...
- metastasis, metastasize, metastatic, metasystem, orthostates, orthostatic,
protostele, stasimon, stasis, stater, static, statoblast, statocyst, statolith, stela...
- metastasis, metastasize, metastatic, metasystem, orthostates, orthostatic,
protostele, stasimon, stasis, stater, static, statoblast, statocyst, statolith, stela...
-
developed leaves but have
minute scales. The
stems and
branches have
protostele, with a triangular-shaped core of xylem. The
scales are
arranged in two...
- and has been
considered an
early actinostele or an "Asteroxylon-type"
protostele. The
tracheids are of the
primitive annular or
helical type (so-called...
