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Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): http://www.nature.com/articles... (external link) Leaves are thin, flat organs responsible for photosynthesis in the plants. using scanning (Selaginellaceae Willk.) Draw a diagram from a prepared slide of the Selaginella strobilus. Aloe vera is also called as wonder plant. Morphology- heart shaped, less than 2 cm, photosynthetic, and has rhizoids. These grow downwards into the surface and form many adventitious roots at their free ends. There are key morphological features found in lycophytes such as microphylls, heterospory, endosporic gametophyte development, as well as the origin of vasculature and a sporophyte dominant life cycle. of Selaginella, whereas about 200 species of 700-750 species are exist. Selaginella plants often resemble ferns due to the pattern of their It develops laterally at the node. Unbranched midrib. Selaginella is the only genus in the family Selaginellaceae.These plants belong to the lycopods, one of the groups previously referred to as fern allies. scopulorum is the common variety in the mountains of the Northern Rocky Mountain Region through the LaSal and Uinta mountains of eastern Utah to west Texas. J. Bot. It has world wide distribution Abundant in tropics and grows in ground and shady places Most common species is Selaginella kraussiana 4. Selaginella lepidophylla is native to the Chihuahuan desert, spanning the border between the US and Mexico. III. The comparative and developmental morphology of the root system of Selaginella selaginoides (L.) Link. Their creeping stems that grow horizontally and the scale-like leaves characterize this group. Draw a diagram to show the morphology of one of these. ex Poir.) About 34 species have been recorded from India; mainly from Himalayas where it grows luxuriantly. It is succulent, perennial and evergreen plant. We present the timing of specific key events (e.g., opening of the megaspore, development of the archegonium, fertilization, first branching) and a morphological and anatomical … S. delicatula, S. ganguliana, S. plana and S. tenera, occurring in … Selaginella produces two types of spores microspores and megaspores. KEY RESULTS: We present an overall well-supported phylogeny of Selaginella, and Selaginella Kraussiana. The morphology of lycophytes has shown little change for more than 350 million years. Some erect branches arise form the main stem. ... Selaginella spp. BY W. C. WORSDELL. The morphology of the group was studied and important features mapped onto the phylogeny. Based upon the typed description of all the taxa along with his own observation Dixit (1992), The resurrection plant Selaginella pulvinata (Hook. Creeping or erect plant body 2. Their creeping stems that grow horizontally and the scale-like leaves characterize this group. 2015 Selaginella (Selaginellaceae) from Bolivia morphology) of the leaves, regardless of leaf type along midrib and outer base, lower surface consist-and position on dorsiventral shoots, they are termed ing of elongate, slightly sinuate-walled cells, without Evolutionary important character of Selaginella is heterosporous nature. Morphology, anatomy and reproduction of Selaginella Morphology of Sporophyte The plant body is the sporophyte, differentiated into root stem and leaves 1. A. b Examples of the morphology of each of the species analyzed. Selaginella is a homosporous pteridophyte. Root 2. II. & Grev.) External Morphology of Selaginella: The sporophyte is an evergreen, delicate herb. Vegetative morphology The plant body is sporophyte and it is differentiated in to 1. However, this lineage has not survived hundreds of millions of years by being overly sensitive to environmental change and S. lepidophylla is a wonderful reminder of that. Selaginella stellata, also recognized by its common name, starry spikemoss or starry spike-moss, is a species of spikemoss of the family Selaginellaceae.It is a type of lycopod that grows naturally in Mexico and Central American countries like Guatemala and Belize and can also be found in the state of Hawaii. Stem: The main stem is prostrate. Let’s learn more about the morphology of leaves, parts of a leaf, different types of leaves and their modifications. There is much variation in the vascular cylinder among the different species of Selaginella. The number of stele varies from species to species and sometimes even in the same species. This is due to the dissection of the main stele. Young plants invariably show monostelic configuration. Psilopsida (Psilotum) & Lycopsida (Selaginella) Study of morphology and reproductive structures of … Based on the morphological characteristics in megaspores and/or microspores, we divided the spores of Chinese species into 15 types and … J. Bot. basal area of little spikemoss increased by 37 percent on ungrazed and 27. percent on grazed land, while grass cover generally decreased. Evolutionary relationships were inferred from both chloroplast (rbcL) and single-copy nuclear gene data (pgiC and SQD1) using a Bayesian inference approach. OPEN access freely available online Morphology of “Selaginella” Comber, Thomas; Abstract. Example S. lepidophylla . I think that the species are separated based upon the reproductive structures, basic habit of growth (prostrate or erect), presence of rhizophores (those little root-like things growing out of the bottom side of the stems),the spores morphology, the orientation of the leaves (2-ranked, whorled, etc), general leaf shape (lanceolate, linear, etc.) (up to family), morphology, anatomy and reproduction of Selaginella, Equisetum and Pteris. See the answer. Morphology of Selaginella 1. Reproductive morphology of the lycophytes In the lycophytes, some leaves do more than merely photosynthesize. Studies to determine the mechanisms involved in the acquisition of desiccation tolerance (DT) have focused on only a few Selaginella species. Two species of Selaginella are provided, S. serpens and S. plana.Both of these are found in Barbados. Unit 4: Gymnosperms (6 … Apical growth takes place by a single cell and its derivatives or by an apical meristem, comprising a group of cells. of Lycopodium, Selaginella, Equisetum and Marsilea. Vegetative morphology The plant body is sporophyte and it is differentiated in to 1. At the same time, the modern morphology-based classification of Selaginella proposed by Jermy (1986) and Jermy (1990) is still widely accepted and these works in combination with Hieronymus (1901–1902) remain the foundation of taxonomic and floristic studies. Abhishek Kumar Singh, Anubhuti Jha, Arindam Bit, Andrey P. Kiassov, Albert A. Rizvanov, Archit Ojha, Pooja Bhoi, Pradeep Kumar Patra, Awanish Kumar, Akalabya Bissoyi, " Selaginella bryopteris Aqueous Extract Improves Stability and Function of Cryopreserved Human Mesenchymal Stem Cells ", Oxidative Medicine and Cellular Longevity,. 819 p. [21159] 16. 2010, 171: 693-712. Some species of Selaginella are found to grow in temperate regions but majority of them are found to occur in the rain forests of tropical countries. In the present study, the surface ornamentations of both megaspores and microspores of 20 species of Selaginella were studied using scanning electron microscopy. There are three different views regarding the morphological nature of the rhizophore. An overview of the morphology, anatomy, and life cycle of a new model species: The lycophyte Selaginella apoda (L.) Spring. C. 12 Laboratory 6 - Reproductive Morphology of Lycopodium and Selaginella I. Lycopodium A. Morphology of Lycopodium strobili and subgenera 1. Exo. Ecological and economical importance of Pteridophytes. Our hypothesis of the evolutionary relationships of Selaginella is well founded based on DNA sequence data, as well as morphology, and is in line with previous findings. Selaginella species. Native to Africa, spikemoss is a cousin to the true ferns, a low growing, mat-forming vascular plant. [TEXT-FIOS. of Sporophyll of Adiantum and sections of sporocarp of Marsilea. It will serve as a fi rm basis for further studies on Selaginella with respect to, e.g., the poorly known alpha taxonomy, as well The salient features of spikes including their types and also the shape and margin of sporophylls of the closely related taxa are characteristically useful in taxonomic delineation. Selaginella is an ancient group of vascular plants with a long lineage of more than 400 million years of evolution (Banks 2009, Korall & Kendrick 2002, Taylor et al. Selaginella densa var. Distribution Genus of some 750 species, mainly in the tropics. CONCLUSIONS: Our hypothesis of the evolutionary relationships of Selaginella is well founded based on DNA sequence data, as well as morphology, and is in line with previous findings. (2001), on the basis of placenta morphology no longer appears valid, all the more so, when set against other far more robust phylogenies based on multiple independent morphological and molecular characters (Renzaglia et al., 2000; Pryer et al., 2001). Its size varies greatly from species to species i.e., from a few cm. raindrop macro shoot. Habit To work effectively with a model species, it is important to understand its morphology, anatomy, and life cycle in detail. Thus, the interesting notion of two distinct pteridophyte lineages proposed by Frey et al. Rhizophore primordia are initiated exogenously at the branching point of the second youngest lateral shoot. Material and methods Choice of taxa This study includes megaspores of 52 species of Selaginella Pal. International Journal of Plant Science 17:693–712. The endospore, when present, has a complex network of two types, fibrillar and reticulate. Macrospore morphology and taxonomy of Selaginella (Selaginellaceae) Author MINAKI, M Osaka City univ., fac. Heterospory and seed habit, stelar evolution. 13: 267--275. Alston, S. ganguliana Dixit, S. plana (Desv. 2010. Using light microscope (LM) and scanning electron microscope (SEM), the megaspores and microspores of 77 samples representing ca. We studied the structure of newly found entomogenous galls in three Indian species of Selaginella, and the ... Their external morphology was analyzed, takingintoaccountthegallform,theirsizeatvarious developmentalstages,andtheirpositionontheplant.

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