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Cortex Phloem Xylem- Хylem Pith Phloem (A) (B) Phloem Xylem Хylem Phloem (C) Leaf gap Leaf trace (D) FIGURE 21-29 Anatomy of fern stems is variable-not only from species to species, but also within a single plant. (A) In this Dennstaedtia and many other ferns, xylem forms a complete ring in transverse section. (B) Phloem occurs on both the exterior and interior of the xylem in ferns; phloem interior to xylem is extremely rare in seed plants (X20). (C) In this Adiantum, the vascular tissue makes almost a complete cylinder. A leaf gap occurs where vascular tissue moves to the leaves. Leaf gaps are characteristic of ferns; they do not occur in the microphyll line of evolution (lycophytes). (D) Members of the microphyll line of evolution, such as this Lycopodium annotinum, do not have pith (X20).

Cortex Phloem Xylem- Хylem Pith Phloem (A) (B) Phloem Xylem Хylem Phloem (C) Leaf gap Leaf trace (D) FIGURE 21-29 Anatomy of fern stems is variable-not only from species to species, but also within a single plant. (A) In this Dennstaedtia and many other ferns, xylem forms a complete ring in transverse section. (B) Phloem occurs on both the exterior and interior of the xylem in ferns; phloem interior to xylem is extremely rare in seed plants (X20). (C) In this Adiantum, the vascular tissue makes almost a complete cylinder. A leaf gap occurs where vascular tissue moves to the leaves. Leaf gaps are characteristic of ferns; they do not occur in the microphyll line of evolution (lycophytes). (D) Members of the microphyll line of evolution, such as this Lycopodium annotinum, do not have pith (X20).

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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A very important feature of ferns is shown: Their shoot xylem is not solid as it was in the rhyniophytes. In the evolution of ferns and seed plants, there was the evolution of pith. A stele with a pith is called a                  . Another significant feature of ferns is that the phloem occurs both to the outer side as well as the inner side of the xylem. Where does it occur in the vascular bundles of flowering plants?

Cortex Phloem Xylem- Хylem Pith Phloem (A) (B) Phloem Xylem Хylem Phloem (C) Leaf gap Leaf trace (D) FIGURE 21-29 Anatomy of fern stems is variable-not only from species to species, but also within a single plant. (A) In this Dennstaedtia and many other ferns, xylem forms a complete ring in transverse section. (B) Phloem occurs on both the exterior and interior of the xylem in ferns; phloem interior to xylem is extremely rare in seed plants (X20). (C) In this Adiantum, the vascular tissue makes almost a complete cylinder. A leaf gap occurs where vascular tissue moves to the leaves. Leaf gaps are characteristic of ferns; they do not occur in the microphyll line of evolution (lycophytes). (D) Members of the microphyll line of evolution, such as this Lycopodium annotinum, do not have pith (X20).
Transcribed Image Text:Cortex Phloem Xylem- Хylem Pith Phloem (A) (B) Phloem Xylem Хylem Phloem (C) Leaf gap Leaf trace (D) FIGURE 21-29 Anatomy of fern stems is variable-not only from species to species, but also within a single plant. (A) In this Dennstaedtia and many other ferns, xylem forms a complete ring in transverse section. (B) Phloem occurs on both the exterior and interior of the xylem in ferns; phloem interior to xylem is extremely rare in seed plants (X20). (C) In this Adiantum, the vascular tissue makes almost a complete cylinder. A leaf gap occurs where vascular tissue moves to the leaves. Leaf gaps are characteristic of ferns; they do not occur in the microphyll line of evolution (lycophytes). (D) Members of the microphyll line of evolution, such as this Lycopodium annotinum, do not have pith (X20).
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