Radula grandilobula Promma & Chantanaorr.

Sarimi, Muhammad Syafiq, Pócs, Tamás & Lee, Gaik Ee, 2021, Data to the Malaysian liverwort flora, III: New Lejeuneaceae records from Sabah and Peninsular Malaysia, Cryptogamie, Bryologie 20 (19), pp. 249-267 : 265-266

Radula grandilobula Promma & Chantanaorr.

( Figs 11E, F ; 14 )

Cryptogamie, Bryologie 36 (3): 219 (2015).

SPECIMEN EXAMINED. — Malaysia. Terengganu: Mt. Tebu Forest Reserve, 15 km S of Jerteh town. Primary lowland dipterocarp forest with small waterfalls and slow stream. Along the forest trail at the Lata Belatan Recreational Forest and waterfall, situated at the base of Mt. Tebu at 100 m alt., on living leaves, 16.IV.2019, G.E. Lee et al. 19022, 19023, 19024, 19025, ibid., 13.III.2021, G.E. Lee 21001, 21002, 21003, 21004.

REMARKS

Radula grandilobula is close to the widespread Indopacific R. acuminata ( Zhu & So 2001) ; differs in having triangularovate leaf lobes, frequently recurved free margin of leaf lobules,

the leaf lobule apices pointing towards the leaf lobe apices or directed away from the stem, and the finely segmented oil bodies, 2-4 per cell ( Promma & Chantanaorrapint 2015). Radula grandilobula was first described in Nakhon Si Thammarat, southern Thailand ( Promma & Chantanaorrapint 2015), and its occurrence in northern Malaysia was therefore expected. New to Peninsular Malaysia (Terengganu). The species has exclusively been found on living leaves.

Figures

FIG. 11. — Colura inuii Horik.: A, habit; B, oil bodies. From G.E.Lee 21010. Colura ari (Steph.) Steph.: C, habit; D, oil bodies. From G.E. Lee et al. 19020. Radula grandilobula Promma & Chantanaorr.: E, habit; F, oil bodies. From G.E. Lee 21003. Scale bars: A, C, E, 2 mm; B, D, 50 µm; F, 25 µm.

FIG. 14. — Radula grandilobula Promma & Chantanaorr.:A, part of plant in ventral view; B, C, leaves; D, median leaf lobe cells; E, leaf lobule and rhizoids (hyaline papilla shown in gray); F, perianth and female bracts; G, cross-section of stem; H, gemma. From G.E. Lee et al. 19022. Scale bars: A, F, 0.5 mm; B, C, 0.2 mm; D, G, 50 µm; E, H, 100 µm.