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1
University Botany I : (Algae, Fungi, Bryophyta And Pteridophyta)
A medullated protostele is known as siphonostele. This type has evolved from
protostele, and it is advanced over the protostele. In siphonostele the vascular
tissues are arranged in the form of a hollow cylinders around the central pith.
2
Fundamentals of Botany Vol-1
5.3.2 Siphonostele In siphonostele, the pith is present in the centre of stele or in
other words, the protostele with pith is called siphonostele. It is also called
medullated protostele. The origin of pith may be intrastelar or extrastelar.
Siphonostele ...
It is also extremely difficult to interpret certain types of siphonostele on the basis
of an invasion of cortical tissue. For example, it is practically impossible to
visualize the type of cortical invasion that would produce polycyclic siphonosteles
.
4
Paleobotany: The Biology and Evolution of Fossil Plants
(A) (B) (C) (D) Figure 7.40 Diagrammatic stages in the evolution of the
siphonostele according to the intrastelar theory: A. haplostele; B. medullated
protostele; C. siphonostele with the beginning of a leaf trace; D. siphonostele with
C-shaped ...
Edith L. Taylor, Thomas N. Taylor, Michael Krings, 2009
FIGURE 4.17 A—C. Siphonostele types. A. Ectophloic siphonostele, with phloem
to outside of xylem. B. Amphiphloic siphonostele, with phloem to outside and
inside. C. Dictyostele, a dissected amphiphloic siphonostele. D. Adiantum
rhizome ...
6
Text Book Of Botany Diversity Of Microbes And Cryptogams
A dictyostele has many scattered vascular strands, each of these strands is
known as » True and false statements I. Siphonostele is a non-medullated stele.
2 A siphonostele with phloem external as well as internal to xylem is ectophloic. 3
.
7
A Text Book Ofbotany: Plant Anatomy and Economic Botany
Siphonostele. A kind of stele in which pith is present in the central region
surrounded by xylem is called siphonostele or medullated protostele. This type of
stele is said to have evolved from the protostele and represents a stage in
evolutionary ...
Pandey S N, S. N. Pandey, Ajanta Chadha, 1993
8
Plant Anatomy and Embryology
Siphonostele. A kind of stele in which pith is present in the central region
surrounded by xylem is called siphonostele or medullated protostele. This type of
stele is said to have evolved from the protostele and represents a stage in
evolutionary ...
S. N. Pandey, Ajanta Chadha, 1996
9
Botany For Degree Pteridophyta
Such a siphonostele is termed by Jeffrey (1910) as Cladosiphonic siphonostele.
In the filicophya the siphonostele may be perforated by smaller or larger leaf
gaps. Such a perforated siphonostele is named by Jeffrey as Phyllosiphonic.
Different types of steles, A. Ectophloic siphonostele, B. Amphiphloic siphonostele,
C. Steriodiagram of a siphonostele, D. Ectophloic solenostele, E. Amphiphloic
solenostele, E Stereodiagram of a solenostele. Vascular strands (b) Extrastelar ...
