Diversity and phylogeny of the brown alga Lobophora (Dictyotales, Phaeophyceae) in Singapore Author Kwan, Valerie 0000-0002-9592-960X Department of Biological Sciences, National University of Singapore, Singapore 117558, Singapore & valeriekwan @ u. nus. edu; https: // orcid. org / 0000 - 0002 - 9592 - 960 X valeriekwan@u.nus.edu Author Yip, Zhi Ting 0000-0003-2664-7585 Department of Biological Sciences, National University of Singapore, Singapore 117558, Singapore & dbsyzt @ nus. edu. sg; https: // orcid. org / 0000 - 0003 - 2664 - 7585 dbsyzt@nus.edu.sg Author Fong, Jenny 0000-0001-8645-1897 Department of Biological Sciences, National University of Singapore, Singapore 117558, Singapore & jenny. jenny @ u. nus. edu; https: // orcid. org / 0000 - 0001 - 8645 - 1897 jenny.jenny@u.nus.edu Author Huang, Danwei 0000-0003-3365-5583 Department of Biological Sciences, National University of Singapore, Singapore 117558, Singapore & Centre for Nature-based Climate Solutions, National University of Singapore, Singapore 117558, Singapore & Tropical Marine Science Institute, National University of Singapore, Singapore 119227, Singapore & huangdanwei @ nus. edu. sg; https: // orcid. org / 0000 - 0003 - 3365 - 5583 huangdanwei@nus.edu.sg text Phytotaxa 2021 2021-04-14 496 3 215 227 http://dx.doi.org/10.11646/phytotaxa.496.3.1 journal article 10.11646/phytotaxa.496.3.1 1179-3163 5423692 Lobophora pachyventera Z.Sun, P.E.Lim, J.Tanaka & H.Kawai in Sun et al. (2012: 507) Specimens observed:— LOBO08, LOBO22, LOBO23, LOBO24, LOBO26, LOBO27, LOBO31, LOBO33, LOBO39, LOBO42, LOBO43 (Reef Ecology Laboratory, NUS) Description:— Thallus large and flabellate with two distinct morphotypes. First morphotype (LOBO22, LOBO24, LOBO26, LOBO33, LOBO42) thallus exhibits decumbent growth form ( Fig. 4G ). Base of thallus narrow, growing with basal parts attached to substrate and distal parts curving upwards. Margin entire. Thallus 3 cm wide and 2.7 cm tall, dark brown. Thallus 141–214 μm thick, composed of a single layer of medulla cells, 2–3 layers of dorsal cortical cells, and 2–4 layers of ventral cortical cells ( Fig. 4H and 4I ). Medulla cells 34–148 μm wide and 43–93 μm thick. Dorsal and ventral cortical cell layers 37–81 μm and 38–81 μm thick respectively. Second morphotype (LOBO08, LOBO23, LOBO27, LOBO31, LOBO39, LOBO43) thallus exhibits crustose growth form ( Fig. 4G , inset). Base of thallus narrow, strongly attached to the substratum. Margin entire. Thallus 2 cm wide and 2 cm tall, orange to reddish brown. Thallus 179–305 μm thick, composed of a single layer of medulla cells, 2–3 layers of dorsal cortical cells, and 2–4 layers of ventral cortical cells. Medulla cells 92–204 μm wide and 71–133 μm thick. Dorsal and ventral cortical cell layers 51–87 μm and 179–305 μm thick respectively. Holotype :— SAP109519 . Sunayama Beach , Miyakojima Island , Okinawa , Japan . 9 May 2009 . Collected by J. Tanaka & Z. Sun. Distribution :— China , Malaysia , Japan ( Sun et al. 2012 ), New Caledonia ( Vieira et al. 2014 ), Taiwan , Vanuatu , ( Vieira et al. 2016 ), Singapore (this study). Habitat :—Reef flat ( 1–2 m depth) and reef crest ( 3–4 m depth). Commonly growing on hard substratum and coral rubble, sometimes epiphytically on coralline algae.