Nephrolepis biserrata

Hovenkamp PH & Miyamoto F, 2005, A conspectus of the native and naturalized species of Nephrolepis (Nephrolepidaceae) in the world, Blumea 50, pp. 279-322 : 314

Nephrolepis biserrata

Two plants with repeatedly furcate pinnae have been collected on Celebes and Java ( Rachmat 122, Bakhuizen 6515), both possibly from cultivation. A similarly furcate form was described as N. davallioides var. furcans by Moore (1873). Furcate forms of N. biserrata are quite regularly fertile, which may serve to distinguish them from similar forms of N. exaltata . A form with irregularly cristate/furcate pinnae was collected on Sarawak (Dyak s.n., Dec. 1908, Bidi , BM).

One plant with a frond with highly dichotomously divided, plumose pinnae alongside a normal sterile frond collected in Thailand ( Eryl Smith 2736, 3 Jan. 1925, K, Setun, Puket, nr sea level on a hill) was originally identified as N. exaltata but may belong to N. biserrata.

A sterile form with irregularly lacerate pinnae was collected near Guayaquil ( Spruce s.n., Dec. 1860, K).

A form with very long (up to 2 cm long and 1 cm wide) acroscopic extensions ( ʻauriclesʼ) at the pinna-bases was collected in Hainan ( H. Fung 20043, 26-29 April 1932, BM, Ling Shui district BM). A similar plant is depicted by Mettenius (1856), plate 26, as N. platyotis .