Nephrolepis x pseudobiserrata Miyam., 2005

Hovenkamp PH & Miyamoto F, 2005, A conspectus of the native and naturalized species of Nephrolepis (Nephrolepidaceae) in the world, Blumea 50, pp. 279-322 : 313-314

26. Nephrolepis x pseudobiserrata Miyam. , hybr. nov.

N. biserrata × N. brownii . Planta hybrida, differt ab N. biserrata sqamis stipitis et rachibus ovato-lanceolatis valde numerosis adpressis margine ciliatis, pinnis basibus supernis auriculatis; ab N. brownii soris submargine, indusis majus rotund-reniformibus, pinnis inferior vix reductis, textura laminae coriaceior. - Typus: Miyamoto & Nakayama 1444 (holo TUAT; iso BISH, BM, K, MICH, NY, TAI), Ryukyu Islands, 11 March 1985.

Plants epiphytic or terrestrial. Rhizome erect to ascending, scales densely set, narrowly ovate, 6-9 by 1.8- 2 mm, dark-brown, lustrous, margin densely ciliate. Stipes 30-50 cm long; basal scales appressed, narrowly ovate, 5-7 by 1.3- 2 mm, centrally dark-brown, lustrous, margin, pale brown, ciliate. Lamina lanceolate; pinnae 40-70 pairs, linear, 3-12 by 1-2.5 cm, margin dentate, acroscopic base auriculate, basiscopic base rounded or cuneate. Indument. Rachis scales dense, appressed, 2-4 by 0.3-0.4 mm. Sori submarginal, indusia round-reniforme. Spores abortive.

Distribution - Ryukyu Islands, but may be found elsewhere as a result of the expansion of the range of N. brownii .

Specimens examined:

JAPAN. Ryukyu Islands: Ishigaki Isl., Sukieda-Yoshihara , 30 m: Miyamoto & Nakayama 1444, 11 March 1985; Miyamoto & Nakayama 1443, 1446, 1447, 1449- 1451, 1454 (all BISH, BM, MICH,

NY, TAI, TUAT); Ishigaki Isl., Ishigaki city, Mt Banna-dake, 80-100 m, Miyamoto & Nakayama 1189-1203 ( TUAT).