Aphyllorchis yachangensis (Orchidaceae), a new holomycotrophic orchid from China

Abstract

Aphyllorchis yachangensis, a new holomycotrophic orchid from Guangxi, southern China is described and illustrated here. This new species is similar to A. caudata but differs from the latter mainly by the sepals acute at the apex, the hypochile with 2 smaller and semicircular wings, the epichile adaxially smooth, acute, the lateral lobes triangular-ovate and the column clavate.

Aphyllorchis periactinantha (Orchidaceae, Neottieae), a new mycoheterotrophic species from peninsular Thailand

“…Comparisons of diagnostic characters were based on Thai specimens, as well as digital images of specimens held at BRI, BKF, K, PSU, and SING, available online, and on relevant taxonomic literature (e.g. Blume 1825; Downie 1925;Dockrill 1965;Seidenfaden 1978;Seidenfaden and Wood 1992;Hsieh et al 2013;Tian et al 2013;Pedersen 2014;Suetsugu et al 2018;Qin et al 2021). Herbarium acronyms follow Index Herbariorum (Thiers 2022).…”

“…Aphyllorchis Blume is one of the largest mycoheterotrophic orchid genera with 19 currently accepted species (POWO 2022), mainly distributed in tropical Asia and the Himalayas, extending to Japan and Australia (Pridgeon et al 2005;Suetsugu et al 2018;Qin et al 2021). Members of this genus are leafless and achlorophyllous herbs with erect and unbranched stems, racemose, many-flowered-inflorescences, petals similar to sepals but shorter and narrower, and a labellum usually divided into hypochile and epichile (Pridgeon et al 2005;Hsieh et al 2013;Tian et al 2013;Suetsugu et al 2018;Qin et al 2021). In Thailand, four species have been recorded: A. caudata Rolfe ex Downie, A. evrardii Gagnep., A. montana Rchb.f.…”