Eria japonica Maxim. 1887 SECTION Aeridostachya
Photo by © Rogier Van Vugt and his P Base Orchid Photo Website
Photo by Natsui
Photo courtesy of Dale and Deni Borders
to 
Common Name The Japanese Eria - In Japan - osa-ran [reed orchid] - In China Gao Shan Ge Lan
Flower Size .4 to .6" [1 to 1.5 cm]
Found in Japan and Taiwan on rocks or tree trunks in forests at elevations around 700 to 900 meters as a miniature sized, cool to cold growing epiphyte or lithophyte with clustered, long-ovoid pseudobulbs carrying 2 apical, long-elliptic to linear, acute to acuminate leaves and blooms on a terminal, brown wooly, 2.4" [6 cm] long, racemose, slender, few flowered inflorescence arising with ovate-cymbiform, shorter than the ovary floral bracts all arising on a new growth occuring in the spring.
Often cited as a synonym of E reptans but that name is invalid because of it's basionym, Dendrobium reptans Franch. & Sav. 1879, was used first in 1805 by Swartz for a plant that is now called Bulbophyllum nutans
Synonyms Aeridostachya reptans (Kuntze) Rauschert 1983; Callista reptans (Ridl.) Kuntze 1891; Conchidium japonicum (Maxim.) S.C.Chen & J.J.Wood 2009; *Dendrobium reptans Franch. & Sav. 1879; Eria arisanensis Hayata 1914; Eria hosokawae A.D.Hawkes & A.H.Heller 1957; Eria reptans (Kuntze) Makino, Bot. Mag. (Tokyo) 15: 128 (1901; Eria reptans (Franch. & Sav.) Schltr. 1919; Eria reptans var. matsudae (Hayata) S.S.Ying 1977; Pinalia japonica (Maxim.) Ormerod 2012
References W3 Tropicos, Kew Monocot list , IPNI ; Orchidaceae Monandre-Dendrobiinae Fr. Kraenzlin 1910 as D reptans; Orchids of Southern Ryukyu Islands Garay & Sweet 1974 drawing fide as E reptans; Minaiture Orchids Northern 1980 as E reptans; Native Orchids of China in Colour Singchi, Zhanhuo and Yibo 1999 as E reptans photo fide; A Field Guide to the Orchids of China Singchi, Zhongjian, Yibo, Xiaohua and Zhanhuo 2009 as E repens photo fide; Flora of China Vol 25 Zhengyi, Raven & Deyuan 2009 as Conchidium japonicum; Flora of China Illustrations Vol 25 Zhengyi, Raven & Deyuan 2010 as Conchidium japonicum drawing fide; A Compendium of Miniature Orchid Species Geristsen & Parsons 2013 photo fide; The Wild Orchids of Taiwam Lin & Wang 2014 photos fide; Atlas of Native Orchids of China Vol 2 Jin Xiaohua, Li Jianwu and Ye Deping 2019 as Conchidium japonicum photo fide;
I have left the next one with it's old name as there are no varieties listed under E japonica
Eria reptans (Franch. & Sav.) Makino 1905 var matsudai
Photo By Andy's Orchids
Found in Taiwan as a cool to warm growing epiphyte that blooms in the winter and spring
Synonyms Eria matsudai Hayata 1920
References W3 Tropicos, Kew Monocot list , IPNI ;
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