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Central National Herbarium (CAL) is of immense value in assessing the biodiversity and status of occurrence of particular species in Indian region by virtue of possessing the treasure of herbarium specimens, since the last two centuries. About 195 genera of Pteridophytes are known to occur in India, of which only 20 genera are being represented by singular species or monotypie. The status of such genera in India has been assessed on the basis of specimens housed in CAL with probable conservation strategies to be adopted.
Dixit et al. (2024) studied this question.