Vashishtha Pteridophytes Pdf

(Requires.) • The United States National Herbarium (US) has a long tradition of botanical studies in the West Indies. At the beginning of the 20th century, Dr. Rose, the first full-time curator of plants at US, carried out extensive field work throughout the West Indies as part of his monographic studies of Cactaceae that was co-authored with Dr.

Botany For Degree Students Algae Vashishtha.pdf Free Download Here FIRST YEAR SCIENCE, 2010-2011 BOTANY PRACTICALS. 2005 Pteridophytes. A Summary of the Status of Threatened Pteridophytes of India Subhash Chandra(1,5), C. For Pteridophytes, which, using criteria established by the IUCN, developed a list of threatened ferns. Of threatened Pteridophytes of India in the present paper based on a new assessment.

Britton of the New York Botanical Garden. During the 1920’s, Emery C. Leonard, participated in various expeditions to Hispaniola (Haiti & Dominican Republic), where he collected and brought to the US herbarium more than ten thousand plant specimens. He collected plants in Hispaniola along with the renowned Swedish botanist Dr. Ekman, and perhaps was instrumental in obtaining duplicates of Ekman’s plant collections and field books. Leonard published several novelties for Hispaniola and intended to publish a floristic treatment for that island but died before he could complete it. Maxon, curator of plants, wrote the first treatment for the Pteridophytes of Puerto Rico and the Virgin Islands for the multivolume publication “Scientific Survey of Porto Rico and the Virgin Islands.” Other workers at US with strong research interests in the region include Dr.

Nicolson, the late Dr. Nicolson published a volume completing the Flora of Dominica while Dr. Naruto shippuden movie 4 sub indo download full. Read published various papers on the palms of the Lesser Antilles. Acevedo is currently curator of West Indian plants at US.

His floristic work includes the study and exploration of the main islands of the Greater Antilles, but his research is currently centered in the Virgin Islands, Puerto Rico and Hispaniola. The main publications of Acevedo and collaborators on the floristics of the region are highlighted in this page. Current projects that include the collaboration of are: and A checklist of the flowering plants of the West Indies. The West Indian collections at the United States National Herbarium are one of the best in the U.S.A. With representatives from most islands. The herbarium also houses numerous and an estimated 125,000 specimens from the region.

In an effort to improve holdings of West Indies collections at US, there is an active exchange program seeking specimens that would help to increase our understanding of the floristics of this region.

ADVERTISEMENTS: The fossil record indicates that bryophytes evolved on earth about 395 – 430 million years ago (i.e. During Silurian period of Paleozoic era). The study of bryophytes is called bryology. Hedwig is called ‘Father of Bryology’. Shiv Ram Kashyap is the ‘Father of Indian Bryology’. Salient features of Bryophytes: 1.

Bryophytes grow in damp and shady places. They follow heterologous haplodiplobiontic type of life cycle. The dominant plant body is gametophyte on which sporophyte is semiparasitic for its nutrition.

ADVERTISEMENTS: 4. The thalloid gametophyte differentiated in to rhizoids, axis (stem) and leaves. Vascular tissues (xylem and phloem) absent. The gametophyte bears multi-cellular and jacketed sex organs (antheridia and archegonia). Sexual reproduction is oogamous type. Multi-cellular embryo develops inside archegonium. Sporophyte differentiated into foot, seta and capsule.

Capsule produces haploid meiospores of similar types (homosporous). Spore germinates into juvenile gametophyte called protonema. Progressive sterilization of sporogenous tissue noticed from lower to higher bryophytes. ADVERTISEMENTS: 13. Bryophytes are classified under three classes: Hepaticae (Liverworts), Anthocerotae (Hornworts) and Musci (Mosses). Classification of Bryophytes: According to the latest recommendations of ICBN (International Code of Botanical Nomenclature), bryophytes have been divided into three classes.

Hepaticae ( Hepaticopsida = Liverworts) 2. Anthocerotae (Anthocertopsida= Hornworts) 3. Musci (Bryopsida= Mosses) Class 1. Hepaticae or Hepaticopsida: 1. Gametophytic plant body is either thalloid or foliose.

If foliose, the lateral appendages (leaves) are without mid-rib. Always dorsiventral. Rhizoids without septa.

Each cell in the thallus contains many chloroplasts; the chloroplasts are without pyrenoi. Sex organs are embedded in the dorsal surface. Sporophyte may be simple (e.g., Riccia) having only a capsule, or differentiated into root, seta and capsule (e.g., Marchantia, Pallia and Porella etc.) 6. Capsule lacks columella. It has 4 orders: (i) Calobryales (ii) Jungermanniales (iii) Spherocarpales (iv) Marchantiales.