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Card. Bull. Singapore 69(2) 2017 
is only known from Tham Pha Tup Forest Park which is less than 1 km 2 in size and 
subject to disturbance from tourism. However, there have been far fewer collections 
made in other forested areas to the north and until it can be assessed whether this 
species also occurs there, its conservation status is uncertain. 
Additional specimens examined. THAILAND: Nan: Tham Pha Toop Forest Park, 230 m, 2 Sep 
1999, Middleton, D.J. 148 (BKF); Tham Pa Tok, 350 m, 13 Sep 1995, Larsen, K. et al. (AAU, 
BKF, SING); Mueang Nan, Tham Pha Toop, 400 m, 18 Sep 1999, Srisanga, P. & Puff, C. 1110 
(BKF, E, QBG); Muang, Taam Paa Toop, c. 300 m, 13 Sep 1995, Nanakorn, W. et al. 4236 (E, 
QBG). 
Notes. This species is recognisable by the colour pattern of the corolla which is pale 
yellow-white with dark reddish-brown spots, and the dimorphic anther indumentum. 
The other pale-coloured species with markings are M. huppatatensis, from which 
M. woodii differs in the slightly compressed corolla mouth and the dimorphic anther 
indumentum, and M. karaketii, which has violet markings and differs in the shape of 
the corolla (more slender). In central and eastern Thailand, M. tubulosa has a similar 
colour pattern, but its corolla is much larger and a very different shape. 
Incertae sedis 
The following specimens could not be determined to species for a variety of reasons, 
either because the material was sterile or otherwise too poor to identify, or because 
the specimen may be of an undescribed taxon but the material inadequate to describe. 
Khon Kaen: Pa Potiyan, 17 Dec 1963, Youngboonkird, U. 129 (BK); Phuphaman NP, 
300 m, 24 Aug 2011, Norsaengsri, M. et al. 8086 (QBG). 
Loei: Phu Kradueng, Maholan Cave, 370 m, 17 Dec 1982, Koyama, H. et al. T-31171 
(BKF). 
Mukdahan: Mueang, Phu Pha Thoep National Park, 175 m, 25 Oct 2015, Suddee, S. 
et al. 4989 (BKF). 
Sakon Nakhon: Phu Pha Man National Park, Laan Sao La to Pha Nang Maen, 14 Oct 
1990, Chantharanothai, P. & Parnell, J. 90/704 (K). 
Saraburi: Phraphutthabath, Khunkhol Tham Makak, 50 m, 20 Nov 2005, Pooma, R. 
et al. 5719 (E); Phraphutthabath, 22 Sep 1999, Wongprasert, T. s.n. (BKF). 
ACKNOWLEDGEMENTS. The authors wish to thank the curators of the herbaria for the loans 
of specimens; Mr Preecha Karaket, Dr Somran Suddee, Dr Pramote Triboun, Dr Thammarat 
_ V 
Phutthai and Dr Naiyana Tetsana for the photographs; Dr Jana Leong-Skornickova for help 
with the figures; the staff of the Forest Herbarium Bangkok (BKF) for their assistance in the 
field; the Davis Fund for supporting field work; and the curators and staff of the Royal Botanic 
