Name: Fragile rockbrake
Distribution: European Russia (N-European Russia); Siberia (Altai, Buryatia, Chita, Irkutsk, Krasnoyarsk, Tuva, W-Siberia, Yakutia); Russian Far East (Amur, Kamchatka, Khabarovsk, Magadan, Sakhalin); Kazakhstan; Kyrgyzstan; Tajikistan; E-Afghanistan; China (Gansu, Hebei, Qinghai, Shaanxi, Shanxi, Sichuan, Xinjiang, NW-Yunnan); Tibet; Mongolia; Japan; Taiwan; Pakistan (Swat, Hazara, Gilgit, Astor); Nepal; Bhutan; India (Jammu & Kashmir, Himachal Pradesh, Sikkim, Uttarakhand); Alaska; Canada (Alberta, British Columbia, Labrador, New Brunswick, Newfoundland, Nova Scotia, Northern Territories, Ontario, Québec, Yukon); USA (Colorado, Connecticut, Iowa, Illinois, Massachusetts, Maine, Michigan, Minnesota, Montana, New Hampshire, New Jersey, Nevada, New York, Oregon, Pennsylvania, Utah, Vermont, Washington State, Wisconsin, West Virginia, Wyoming)
14 RUS 30 SIB 31 RFE 32 KAZ KGZ TZK 34 AFG 36 CHI TIB 37 MON 38 JAP TAI 40 BHU IND NEP PAK 70 ASK CDN 71 CDN 72 CDN 73 USA 74 USA 75 USA 76 USA
Synonyms: hidden
= Allosorus gracilis (Michx.) C.Presl; Tent. Pterid. 153 (1836)
= Allosorus gracilis (Michx.) Farw.; Rep. (Annual) Michigan Acad. Sci. 21: 345 (1919), isonym
= Allosorus minutus Turcz. ex Trautv.; Pl. Imag. Fl. Ross. 9: t. 3 (1844)
= Allosorus stelleri (S.G.Gmel.) Rupr.; Beitr. Pflanzenk. Russ. Reiches 3: 47 (1845)
= Cheilanthes gracilis (Michx.) Kaulf.; Enum. Filic. [Kaulfuss] 209 (1824)
= Cryptogramma crispa var. japonica Miyabe & Kudô; Fl. Hokkaido 1: 37 (1930) (tentative synonym)
= Cryptogramma gracilis (Michx.) Clute; Fern Bull. 14: 119 (1906)
= Pellaea gracilis (Michx.) Hook.; Sp. Fil. [W. J. Hooker] 2: 138, t. 133 B (1858)
= Pellaea stelleri (S.G.Gmel.) Baker; Syn. Fil. [W. J. Hooker & Baker] 453 (1868)
= Pteris gracilis Michx.; Fl. Bor.-Amer. (Michaux) 2: 262 (1803)
= Pteris minuta Turcz.; Bull. Soc. Imp. Naturalistes Moscou 11: 105 (1838)
= Pteris stelleri S.G.Gmel.; Novi Comment. Acad. Sci. Imp. Petrop. 12: 519 (1768)