Wednesday, July 7, 2021

[Botany • 2021] Aphyllorchis yachangensis (Orchidaceae: Epidendroideae) • A New Holomycotrophic Orchid from Guangxi, southern China

Aphyllorchis yachangensis Ying Qin & Yan Liu,  

in Qin, Chen, Deng et Liu, 2021. 

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.

Keywords: Aphyllorchis, Guangxi Province, new taxa, saprophytic Orchidaceae, taxonomy

Figure 1.Aphyllorchis yachangensis Ying Qin & Yan Liu. 
A flowering habit B inflorescence C bract D flower in side view E flower in front view F column in top view G column in ventral view H lip, dorsal sepal, lateral sepals, petals, column and ovary I column in side view J lip in side view K lip in top view L pollinaria M anther cap in top view N rhizome and roots.
 Photographed by Ying Qin from Ying Qin et al. QY20190719001 (holotype: IBK!).

Aphyllorchis yachangensis Ying Qin & Yan Liu, sp. nov.
Diagnosis: Aphyllorchis yachangensis is similar to A. caudata but differs from the latter mainly by its hypochile with two wings of 1–1.4 × 0.4–0.6 mm (vs. 2–3 × ca. 4 mm), epichile adaxially smooth (vs. densely papillose), lateral lobes triangular-ovate (vs. semicircular), sepals acute at apex (vs. long cuspidate) and column clavate (vs. approximately cylindrical). Detailed morphological comparisons between A. yachangensis and A. caudata are provided in Table 1.

Etymology: The specific epithet is derived from the type locality, Yachang Orchid National Nature Reserve.

Chinese name: 雅长无叶兰 (Ya Chang Wu Ye Lan)

Figure 2. Aphyllorchis yachangensis (an individual with dark colors in the same environment with Ying Qin et al. QY20190719001)
 A flowering habit B bud C flower in back view D flower in front view.
Photographed by Ying Qin from Ying Qin et al. QYYC20200703009 (paratype: IBK!).

 Ying Qin, Hailing Chen, Zhenhai Deng and Yan Liu. 2021. Aphyllorchis yachangensis (Orchidaceae), A New Holomycotrophic Orchid from China. PhytoKeys. 179: 91-97. DOI: 10.3897/phytokeys.179.63994