A pteridophyte is a vascular plant with xylem and phloem that disperses spores. Because pteridophytes produce neither flowers nor seeds , they are sometimes referred to as " cryptogams ", meaning that their means of reproduction is hidden. Ferns , horsetails often treated as ferns , and lycophytes clubmosses , spikemosses , and quillworts are all pteridophytes. However, they do not form a monophyletic group because ferns and horsetails are more closely related to seed plants than to lycophytes. Ferns and lycophytes share a life cycle and are often collectively treated or studied, for example by the International Association of Pteridologists and the Pteridophyte Phylogeny Group.
Volume 1 Number 1 (2007)
Journal of Plant Research | Updates
The stele is a real entity and present universally in all axis of higher plants. The primary components of stele are xylem and phloem. Tissues like pericycle , medullary rays and pith are also the components of stele. Both these components stele and cortex are separated by the endodermis.
In vitro antibacterial activity of fronds (leaves) of some important pteridophytes
Submit an Article Submit Now. Subscribe hard copy of subscription Subscribe now. Series-1 Series-2 Series-3 Series Abstract: The appendix averages 11 cm in length but can range from 2 to 20 cm. The diameter of the appendix is usually between 7 and 8 mm, the human appendix is considered a vestigial structure, acute appendicitis is the commonest cause of acute abdominal pain in the world and appendectomy is the commonest abdominal operation.
The past quarter-century has witnessed a revolution in our understanding of the phylogenetics, systematics, and ecology of pteridophytes ferns and lycophytes , particularly due to the rapid accumulation of plastid sequence data and a renewed interest in the ecology of the sexual phase of the life cycle. We here compile 19 papers recently published in the Journal of Plant Research dealing with the biology of pteridophytes, grouped into six categories: 1 breeding systems, 2 species complexes and polyploidization, 3 fossil taxa, 4 gametophyte ecology, 5 systematics, 6 biodiversity. We hope this collection of papers will be of value to researchers interested in this fascinating group of plants. Our understanding of the phylogeny of pteridophytes ferns and lycophytes was revolutionized starting in with the sequencing and phylogenetic analysis of the plastid rbcL gene Hasebe et al. This ushered in the modern era of pteridophyte systematics, which has witnessed increasingly sophisticated analyses of the evolutionary relationships of seed-free vascular plants Pryer et al.