Rhaphidophora korthalsii Schott

Wong, Sin Yeng & Joling, Jyloerica, 2021, Checklist of aroids (Alismatales, Araceae) from Sabah (Malaysian Borneo), Check List 17 (3), pp. 931-974 : 958-959

Rhaphidophora korthalsii Schott

Material examined. MALAYSIA – Pedalaman • Tenom, Malutut, north ridge of Mt. Malutut , ca. 15 km N of Tenom; [05°15′11″N, 115°55′28″E]; 450 m elev.; 21 De- cember 1968; Kokawa & Hotta 2455 (L) • Tenom, Sungai kaang; 05°08′54″N, 115°58′27″E; 28 March 1987; Asik Mantor SAN 120296 ( SAN) – Pantai Barat • Penampang, Tungol, Togudon KM48 Jalan Tambunan / Penampang ; 05°46′48″N, 116°20′43″E; 24 August 1989; Sumbing J. SAN 127801 ( SAN) • Ranau, Bukit Kulung , 06°01′26″N, 116°40′18″E; 6 October1987; W.Meijer SAN 122429 ( SAN) • Ranau, Bundu Tuhan Forest Reserve ; 05°58′58″N, 116°32′32″E; 1371.6 m (4500 ft.) elev.; 28 June 1994; J. T. Pereira 9 (K, KEP, SAN) • Ranau , Kinabalu

Road to Mesilau; [06°02′41″N, 116°35′44″E]; 1219.2 m (4000 ft.) elev.; 16 August 1963; G. Mikil SAN 38691 ( SAN) • Ranau , Mount Kinabalu, Dallas; [06°05′30″N, 116°32′45″E]; 914.4 m (3000 ft.) elev.; 15 September 1931; Clemens & Clemens 26495 (P) • Ranau , Mount Kinabalu , Penataran, Penataran River; [06°05′30″N, 116°32′45″E]; 914 m elev.; 28 July 1933; Clemens & Clemens 34298 (L) • Ranau , Mount Kinabalu, Silau Basin; [06°05′30″N, 116°32′45″E]; 1828.8 m elev.; 8 April 1932; C. X. Furtado 29146A (L, SAR) • Ranau , Mount Kinabalu, Upper Kinabalu; [06°05′30″N, 116°32′45″E]; 1829 m elev.; 8 April 1932; Clemens & Clemens 29146 (L) – Sandakan • Kinabatangan , Lamag, Batu Puteh; [05°25′14″N, 117°56′25″E]; 16 February 1978; G. Majawat & P. Lassan SAN 88017 ( SAN) • Kinabatangan , Lamag, Sungai Pin; [05°21′19″N, 117°55′55″E]; 29 November 1978; Dewol S. & Harun T. SAN 89922 ( SAN) • Kinabatangan , Tabin wildlife Reserve , Northern Part Near Tabin River , Valley behind limestone ridge toward Bukit Quion; 05°19′N, 118°45′E; 180 m elev.; 21 October 2000; A. D. Poulsen 1680 ( SAN, KEP, AAU, K) • Sandakan , Batu 15 Sepilok; [05°53′28″N, 117°56′08″E]; 24 November 1961; W. Meijer SAN 28394 ( SAN) • Sandakan , Gomantong Forest Reserve , Dulong Lambu limestone massif, Gomantong limestone hill, dry cliff; 05°33′30″N, 118°06′30″E; 200 m elev.; 28 April 1996; S. P. Lim 591 ( SAN) • Sandakan , Labuk Road, Mile 15; [05°53′20″N, 117°56′41″E]; 17 March 1949; A. Cuadra A 2237 ( SAN) • Sandakan , Segaliud Lokan Forest Reserve; [05°31′45″N, 117°32′02″E]; 23 January 1975; Aban G. SAN 80977 ( SAN) • Telupid , Tawai Hill; 05°31′51″N, 117°06′17″E; 19 October 1985; Dewol et al. SAN 109574 ( SAN) – Tawau • Lahad Datu , Madai-Baturong Forest Reserve Madai Hill; 04°41′18″N; 118°1′55″E; 9 June 1996; S. P. Lim 654 ( SAN) • same loacality; S. P. Lim 706 ( SAN) • Lahad Datu , Malua Forest Reserve; 05°04′54″N, 117°38′23″E; 4 August 1990; De- wol S. SAN 129751 ( SAN) • Lahad Datu , Ulu Sungai Danum North of Camp 111; [04°56′00″N, 117°29′45″E]; 9 September 1976; B.C. Stone et al. SAN 85310 ( SAN) • Lahad Datu , Ulu Sungai Danum S. of Camp 3; [04°56′00″N, 117°29′45″E]; 2 September 1976; B. C. Stone et al. SAN 85269 ( SAN) • Lahad Datu , Ulu Sungai Danum, growing on ridge NE of camp site; [04°56′00″N, 117°29′45″E]; 426.72 m (1400 ft.) elev.; 28 August 1976; Lantoh SAN 85121 ( SAN) • Semporna , Bohey Dulang Island; 04°35′59″N, 118°47′04″E; 50 m elev.; 13 October 1998; J. B. Sugau et al. SIP-G 29 ( SAN) • Tawau , Luasong camp Luasong camps N.B.T., about 60 KM NW of Tawau; [04°36′23″N, 117°24′03″E]; 100 m elev.; 7 No- vember 1968; Kokawa & Hotta 797 (P) .

Identification. The pre-adult stage of R. korthalsii may prove difficult to distinguish from Epipremnum pinnatum due to limited herbarium collection. However, R. korthalsii can be distinguished from Epipremnum pinnatum from its stems lacking the prominent irregular whitish longitudinal crests, the feeding roots are prominently scaly, the shape of the round style apex, the punctiform and circumferential of the stigma, and the fruits each contain many small, ellipsoid seeds with a brittle, smooth testa ( Boyce 1999).

Distribution and ecology. Widespread. Primary to disturbed secondary lowland, hill and montane forest, moss forest, peatswamp forest, on trees, rocks, and cliffs on a variety of substrates including limestone and ultrabasic soils. 20–1800 m elev.