collect the leaves of various plants prepare a herbarium .write a brief report on their shapes,sizeand venation.
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Answer:
A voucher herbarium specimen is a pressed plant sample deposited for future reference. It supports research work and may be examined to verify the identity of the specific plant used in a study. A voucher specimen must be deposited in a recognized herbarium committed to long-term maintenance. More information on herbaria may be found in our web document "Herbaria and Herbarium Specimens."
Why is voucher material needed? Plant classification is constantly changing. Shifts in species alignments and groupings are made as new evidence comes to light. Identifications are subject to change. Vouchers specimens help cross-reference these changes to previous research.
GETTING STARTED
Preplanning for the preparation of voucher specimens is crucial. Arrangements should include:
targeting collection locations and date periods to obtain useful specimens;
obtaining collection permits from appropriate agencies (this can take months); and
establishing official contact with government, herbarium, and research personnel in the area you will be working. This is required by law in most countries.
PRESSING AND DRYING PLANT SPECIMENS
Specimens are pressed in a plant press, which consists of a wooden frame (for rigidity), corrugated cardboard ventilators (to allow air to flow through the press), blotter paper (to absorb moisture), and folded paper, typically a newspaper (to contain the plant material). The plant press is tightened using straps with buckles or bolts with wing nuts. The objective of pressing plants is to extract moisture in the shortest period of time, while preserving the morphological integrity of the plant, and to yield material that can be readily mounted on herbarium paper (an acid-free cardstock) for long-term storage.
Example of a leaf by which can prepare herbarium is leaf of peepal.
Shape : Peepal leaf has the shape of a heart. This leaf has an extended tip.
Size : They are 10 to 17 cm long and has a breadth of 8 to 12 cm.
Venation : The leaves of peepal has reticulate type of venation.
Herbarium is one such taxonomical aid where the specimens of plants are dried and then pressed and preserved on the sheets.
The herbarium must contain correct information about the specimen.