A new Macrosolen from Brunei Darussalam 
71 
Fig. 3. Habitat of Macrosolen brunsing Y.W.Low & Ariffin in the lowland mixed dipterocarp 
forest of the Nyamoking Dam, Ladan Hills Forest Reserve. Foreground is the blue roof campsite 
at the edge of lake. (Photo: A.K. Muhammad Ariffin) 
point of reflexion along the sutures of the lobes extending above the neck to the apex 
of the bud, somewhat zygomorphic, 17-21 mm long, inflated in the lower part, winged 
below the middle, clavate above a long neck and acute at apex, mostly red with a 
thick black band at neck and a black spot at apex; tube in open flowers 9-11 mm long 
with the narrowly spathulate lobes reflexed c. 3 mm above the margin of the throat. 
Stamens 6, inserted slightly below the throat of the corolla tube, at the middle of the 
corolla lobes, greenish yellow, basifixed, immobile; filaments c. 5 mm long, c. 3 mm 
protruding out from the corolla-tube mouth; anthers 3—4 mm long, base obtuse, apex 
acute. Style c. 1.8 cm long, greenish yellow, glabrous; stigma club-shaped, c. 1 mm 
long, red. Fruit broadly prolate to globose, c. 0.8-0.9 cm long, 0.6-0.7 cm wide, 
mostly bright yellow except for the green apex, smooth. 
Additional specimen examined. BORNEO: Brunei: Tutong District, Rambai, Ladan Hills 
Forest Reserve, Nyamokning Dam, Hulu Sungai Tutong, ridge of lowland mixed dipterocarp 
forest on yellow sandy clay soils, 04°20T4.2"N 114°49'076"E, 152 m asl, 20 Aug 2016, Y.W. 
Low, M.I. Siti Nur Bazilah, A.K. Muhd. Ariffin, A. Watu, P. Azlan, K. Muhd. Khaind Nizam & 
Z.A. Muhd. Wafiuddin LYW1059, sterile (BRUN, SING). 
Distribution and Habitat. Macrosolen brunsing Y.W.Low & Ariffin is so far known 
only from the Ladan Hills Lorest Reserve, in the lowland mixed dipterocarp forest on 
yellow sandy clay soils. (Lig. 3, 4) 
