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tus, mellifer, albus, apice flavescens, c. 1.15 cm. longus. Ovarium 

 Gsulcatum, viride, c. 0.35 cm. longum, cum pedicello dilute viridi 

 c. 0.8 cm. longo sigmoideum. 



Sumatra: Lampong, Goenoeng Soegi. (W. J. D. van Andel, 

 liv. pi. cuit, in llort. Bog. sub n. 32). Benkoelen, Boekit Kaba, 

 Soeban Ajam, 1000 m. (Exp. E. Jacob son 1916, Ajoeb, liv. 

 pi. cuit, in Mort. Bog.) 



A species of the section Calcavifera, perhaps nearest to D. 

 Derryi Ridl., but according to the description differing in some 

 points, viz. the acute leaves, not solitary green flowers, differ- 

 ently shaped lip, so that I do not venture to combine the 

 two plants. 



Description from cultivated plants. 



lleii<lrol»iiiiii (sect. Calcarifora) llacliiiiafii J. J S. 



n. sp. 



Gaules elongati, sectione transversa sicco rhomboidei. c. 0.4 (> 

 cm. lati, •internodiis c. 3.2 cm. longis, summis brevissimis, c. 

 0.7 cm. longis. Eolia patentissima, supra basin reciirva, anguste 

 lanceolata, apicern versus angustata, obtusa, apiculata, sicco supra 

 subtusque prominenter nervosa, firmiter papyracea, c. 0.75 — 8.25 

 cm. longa, 0.7- 95 cm. lata; vaginae internodia multo super- 

 antes, tubulosae, glabrae, sicco prominenter nervosae et purpureo- 

 suffusae. Intlorescentiae ad nodos caulium inter et infra folia, 

 plerumque patentissimao vel recurvae, brèves, laxe c. -i — 5florae, 

 pedunculo c. 0.9-1.7 cm. longo, basi nonnullis vaginulis bre- 

 vibus tubulosis donato, rachide flexuosa, c. 1.4 — 2.5 cm. longa. 

 Bracteae triangulae, concavae, sicco ad c. 35 cm. longue. Flores 

 magni, c. 4.4 cm. longi. Sepalum dorsale subovatooblongum, 

 apicem versus angustatum, obtusum, basi Snervium, c. 1.9 cm. 

 longum, 0.75 cm. latum. Sepala lateralia lacinia elongata anguste 

 triangula ad pedem gynostemii decurrentia, mentum magnum, 

 pedicello parallolum vix curvulum anguste conicum anguste ob- 

 tusum c. 2.35 cm. longum formantia, marginibus anticis longi- 

 tudino c. 0.8 cm. connata, parte antica oblique oblonga, obtusa, 

 c. 2.1 cm., usque ad apicem menti c. 3.8 cm. longa, basi 2.4 

 cm. metientia. Petala oblique oblonga, apicem versus dilatata, 



