Porella japonica (Sande Lac.) Mitt. var. japonica , Trans. Linn. Soc. London, Bot.

Porella japonica (Sande Lac.) Mitt. var. japonica, Trans. Linn. Soc. London, Bot. View in CoL 3 (3): 202. 1891.

Representative specimens examined:— CHINA. Guangxi, Jingxi Co., Renzhuang Town, Bangliang Village, Bangliang National Nature Reserve, 650–750 m, on rock, 19 Aug. 2008, Y.-M. Wei 8-626A (IBK, reported by Xie et al. (2012 as P. longifolia )); ibid., 22°54.927 ′ N, 106°29.164 ′ E, 650–750 m, on rock, Y.-M. Wei 8-632 (IBK, reported by Xie et al. (2012 as P. longifolia )). Guangxi, Napo Co., Baisheng Town, Nonglong Village, Laohutiao Nature Reserve, 23°14.25 ′ N, 105°33.25 ′ E, 1160–1200 m, on rock, 19 Oct. 2008, Y.-M. Wei 10-596 (IBK, reported by Xie et al. (2012 as P. longifolia )); ibid., 23°14.25 ′ N, 105°33.25 ′ E, 1160–1200 m, on rock, 19 Oct. 2008, Y.-M. Wei 10-640A (IBK, reported by Xie et al. (2012 as P. longifolia )).

Notes:— Porella japonica var. japonica is known from Bhutan, China, India, Indonesia, Japan, Korea, the Marianas, Myanmar, Sri Lanka, the Philippines, and Vietnam ( Inoue 1959; Miller et al. 1983; Long & Grolle 1990; Long & Rubasinghe 2014; Shu et al. 2017). Porella japonica is divided into one subspecies and two varieties ( Söderström et al. 2016). The voucher specimens reported by Xie et al. (2012) as P. longifolia belong to Porella japonica var. japonica .

Porella perrottetiana (Mont.) Trevis. var. perrottetiana, Mem. Reale Ist. Lombardo Sci. View in CoL (Ser. 3), C. Sci. Mat. 4 (13): 408. 1877.

Specimens examined:— CHINA. Guangdong, Ruyuan Co., Ruyuan Forestry Bureau, Longxidong, on valley in dense forest, 21 Jun. 1973, B.-J. Lin 1131 (HSNU, IBSC reported by Zhu & Cheng (2013 as P. longifolia View in CoL )).

Notes:— Porella perrottetiana comprises four varieties ( Söderström et al. 2016). The voucher specimen reported by Zhu & Cheng (2013 as P. longifolia ) is assignable to Porella perrottetiana var. perrottetiana .