Cyrtomium remotipinnum and its allies, 1836

Nong, Su-Yun, Liu, Yan, Yan, Ke-Jian & Wei, Hong-Jin, 2023, Cyrtomium remotipinnum (Dryopteridaceae), a new species from karst area in Guangxi, China, Phytotaxa 607 (2), pp. 133-141 : 140

Key to Cyrtomium remotipinnum and its allies .

1a. Lateral pinnae large, 12–19 × 4–10 cm ...................................................................................................................... C. guizhouense

1b. Lateral pinnae small, 3–10 × 1–3 cm.

2a. Scales on stipe base brown to dark brown; lateral pinnae somewhat falcate, base asymmetrical, subtruncate or shallowly obliquely cordate ......................................................................................................................................................................... C. shingianum

2b. Scales on stipe base brown; lateral pinnae often straight, base symmetrical, cordate.

3a. Frond more than 60 cm; lateral pinnae remotely spaced, more than 3.5× as long as wide, apex acuminate.......... C. remotipinnum

3b. Frond less than 60 cm; lateral pinnae imbricate or closely spaced, less than 2.5× as long as wide, apex acute.

4a. Lateral pinnae 9–18 pairs, 11–22 mm wide; sori 1–2 rows.................................................................................................... C. calcis

4b. Lateral pinnae 3–8 pairs, 25–30 mm wide; sori 4 rows ........................................................................................... C. pachyphyllum