Adiantum × ailaoshanense

Wang, Ying, Shang, Hui, Zhou, Xi-Le, Zhao, Guo-Hua, Dai, Xi-Ling & Yan, Yue-Hong, 2015, Adiantum ailaoshanense (Pteridaceae), a new natural hybrid from Yunnan, China, Phytotaxa 236 (3), pp. 266-272 : 271

Key to Adiantum × ailaoshanense with its parents and other related taxa

1. Stipes, rachises, and both sides of lamina with multicellular brown hairs.........................................................................................2

–. Stipes, rachises, and both surfaces of lamina glabrous or occasionally with 1 or 2 stiff hairs...........................................................3

2. Pinna upper margins subentire or lobed for 3 or 4 short, broad lobes................................................................................. A. sinicum

–. Pinna upper margins parted into many narrow, long segments.................................................................................... A. malesianum

3. Pinna stalk 7–15 mm ..........................................................................................................................................................................4

–. Pinna stalk 2–3 mm ............................................................................................................................................................................5

4. Fertile pinnae parted into 2–5 long segments............................................................................................................ A. menglianense

–. Fertile pinnae subentire or with 2–4 shallow sinuses.................................................................................................... A. philippense

5. Fertile pinna upper margins divided for 1/3–1/2 of breadth, with 4–10 lobes or more; indusia with upper margins depressed, sori usually more than 8 per pinna ............................................................................................................................... A. × meishanianum

–. Fertile pinna upper margins usually lobed, rarely divided for 1/2 of breadth, with 4–7 lobes; indusia with upper margins flat and straight, sori usually less than 8 per pinna............................................................................................................. A. × ailaoshanense