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Herbertus aduncus (Dicks.) Gray, Nat. Arr. Brit. Pl. 1: 705. 1821 subsp. aduncus.
Jungermannia adunca Dicks., Pl. Crypt. Brit. Fasc. 3: 12. 1793.
Herbertus darjeelingensis H.A.Mill., J. Hattori Bot. Lab. 28: 307. 1965, nom. Illeg.
Schisma gracilis Steph., Sp. Hepat. 6: 359. 1922, non Mont. 1843 (‘gracile’).
Schisma fragilis Steph., Sp. Hepat. 6: 359. 1922 (‘fragile’).
Herberta fragilis (Steph.) H.A.Mill., J. Hattori Bot. Lab. 28: 311. 1965.

Distribution: India [AR: West Siang (D.K. Singh & Singh Deo, 2014); KL: Vellarimala (Manju & al., 2006); ML: Elephant ffalls (A.P. Singh & Nath, 2007a as H. fragilis); MN: West Mountain (D. Singh & al., 2010a); NL: Kohima, Khuzama (Eshuo, 2014); SK: East Sikkim, Tsomgo lake (Herzog, 1939 as H. fragilis; Miller, 1965 as H. darjeelingensis; Juslén, 2006), West Sikkim, Khangchendzonga BR, Migothang – Nayathang (Hattori, 1966 as H. fragilis); WB: Tiger Hill, Kurseong (Hattori, 1966), Darjeeling (Juslén, 2006)], Bhutan (Juslén, 2006), China (Piippo, 1990), Japan (Yamada & Iwatsuki, 2006), Korea (Song & Yamada, 2006), Nepal (Hattori, 1975a as H. fragilis; Pradhan & Joshi, 2009), Philippines (Tan & Engel, 1986), Russia (Konstantinova & al., 2009), Taiwan (Wang & al., 2011), North America (Stotler & CrandallStotler, 1977). Note: Stephani (1922) described this species as S. gracilis ‘gracile’ and S. fragilis ‘fragile’ from ‘Sikkim Himalaya’ – a term used earlier to usually include localities of present day Darjeeling sub division of West Bengal.
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