Notes on the taxonomy and distribution of two rare Thelypteris (Thelypteridaceae) species from Arunachal Pradesh, India, T. repanda and T. birii

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Thelypteris birii. a. Frond, b. Rhizome, c. Stipe-base scales, d. Hairs on costa and veins, e. Venation and soral arrangement.

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