Athyrium wallichianum

Athyrium wallichianum Ching, Bull. Fan Mem. Inst. Biol., Bot. 8(6): 497-498 497 1938. (Syn: Aspidium brunonianum Wall.; Aspidium brunonianum Wall. ex Mett.; Dryopteris brunoniana (Wall. ex Mett.) Kuntze; Lastrea brunoniana (Wall. ex Mett.) Bedd.; Lastrea brunoniana C. Presl;  Nephrodium brunonianum (Wall. ex Mett.) Hook.);
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Pakistan to China (Sichuan, NW. Yunnan) and Indo-China: China South-Central, East Himalaya, Laos, Myanmar, Nepal, Pakistan, Tibet, West Himalaya as per POWO;
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Flora of Uttarakhand- Fern1 for Id- JM:
Wild Herb captured on 13/8/10 during the trek from Ghangaria (around 11,000 ft.) to Hemkunt Sahib (around 14000 ft.). 

-I am not surprised it had you wondering what it is.  This, along with Athyrium drepanopterum, always gets confused as it looks superficially like a Dryopteris. But it is in fact an Athyrium!  A. wallichianum Ching.

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References:
POWO