BISC 337 Lecture Notes - Lecture 10: Polypodiales, Leptosporangiate Fern, Pericycle

• School: Simon Fraser University
• Department: Department of Humanities Biological Sciences
• Course: BISC 337
• Professor: Aubrey Pearson

Document Summary

Phylum: monilophytes (pteridophyta: secondary xylem, leptosporangia (sporangium that arises from a single initial cell, loss of roots & leaves (epiphytes) Stem: short and compressed: typically little elongation of the internodes. Most temperate ferns are perennial forms roots: originate from pericycle (i. e. adventitious roots, vicinity of leaf base stem anatomy is dominated by the stele. Refers to the central cylinder of tissue lying inside the cortex (ground tissue region) i. e. vascular bundle includes: xylem, phloem, pericycle (tissue between the endodermis and phloem) Jan 29: parenchymal cells with meristematic properties, pith (if present) Most common type of stele is the siphonostele. Ferns (polypodiophyte) produce endarch siphonosteles (a derived trait also present in. Equisetophytes and seed plants: siphonostele has a central column of pith & one of the simplest steles in the ferns. Exarch describe xylem maturation in which the older cells (protoxylem) are further from the centre of the axis than the younger cells.