A herbarium sheet, on which first description of plant is based, is termed as
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Correct option is A)
The holotype is a specimen or illustration which is designated as a representative of a species and is used for identification of the new specimen. It is mounted on a single herbarium sheet or is preserved in other preparations. Whereas lectotype is the specimen or any other material which is selected from original material when holotype is not available. A specimen or any other material which serve as type specimen in absence of holotype, isotype, paratype or syntype is referred to as neotype. Thus, the correct answer is option A.