- 16 — 



Sumatra: Ophir districts, to the iiorth of Taloe, on a mountainridge 

 in forest; rare. (H. A. B. Bunnemeijer il 107. April 1917). 



The species is probably nearest to A. latifolia Rolfe from Perak, 

 from whicli it is distinct in the form oî the leaves. the triangular bracts, 

 much larger flowers and the style surpassing the anthers. 



The flowers are said to be white. 



Description from a single dried spécimen. 



The anthers of Adactylus hâve been described as basifix and equally 

 21obed at the base. This is certainly not the case in A. elliptica J. J. S. 

 Hère they are dorsifix though attached very shortly above the base, which 

 is slightly oblique. 



A p o s t a s i a (sect. Mesodactylus) p 1 a t y s t y 1 i s J. J. S. n. sp. 



Caulis erectus, validus, teres, c. 34 cm altus, dense foliatus, basi ra- 

 diées verticales rigidas plus minusve serpentinas ramosas emiftens. Folia 

 e basi erecto-patente recurvula, elongata, linearia, basin versus paulum 

 angustata et sensim in vaginam dilatata, apicem versus sensim longissime 

 et angustissime acuminata, longissime nuicronata, nervis 5 conspicuis sub- 

 tus prominentibus, pluribus nervis tenuibus sicco utrinque prominulis in- 

 terpositis. sicco papyracea, cum vagina c. 29 — 31 cm. longa, 1.6— 2 cm. lata. 

 Inflorescentiae terminales et ex axillis, laxe ramosae, recurvae, laxe pluri- 

 florae, c. 10 cm. longae, pedunculo foliaceo-vaginulato c. 2.5 cm. longo, 

 ramulo terminali ad c. 7.5 cm. longo, ad c. 12 floro, rachide compressa, 

 subbialata. Bracteae adpressae, late triangulae, acutae, concavae, nervis 3 

 dorso prominentibus, ad c. 0.5 cm. longae. Flores patentes, in génère ma- 

 jusculi. Sepalum dorsale recurvum, lanceolatum, apicem versus sensim an- 

 gustatum et longe lateraliter compresso-cuculiatum, obtusum, inferne con- 

 vexum, fascia mediana carnosula, 5nervium, nervis intus leviter sulcatis, 

 Costa média dorso obtuse incrassata et ultra apicem in mucronem satis 

 longum subulatum incurvulum productum, totum c. 0.95 cm. longum, 

 0.25 cm. latum, mucrone c. 0.075 cm. longo. Sepala lateralia intermedio 

 similia sed obliqua, infra médium valde recurva, tota bene 1 cm. longa, 

 mucrone incurvulo lateraliter compresso c. 0.12 cm. longo, 0.25 cm. lata. 

 Petala erecta, plus miiiusve recurva, e basi breviter cuneata paulum an- 

 gustata, oblique lineari-oblonga, obtusa, subundulata, subirregulariter mar- 

 ginata, praesertim superne concava, 3nervia, nervis exterioribus basi ramosis, 

 Costa média dorso valde obtuse incrassata et in praefloratione inter sepala 

 posita apice in mucronem brevem abrupte incurvum producta, quam sepala 

 tenuiora, bene 0.9 cm. longa, supra basin c. 0.25 cm., superne c. 0.2 cm. 

 lata. Labellum petalis simile, patentissimum, recurvulum, concavum, apice 

 lateraliter compresso-cuculiatum, parte mediana praesertim ad basin con- 

 vexum. supra basin paulum cuneato-dilatatam lineari-oblongum, obtusum, 

 subirregulariter marginatum, basi 3 supra basin 5nervium, costa média 

 dorso valde incrassata apice in mucronem suberectum lateraliter 

 compressum producta. fere 1.1 cm. longum, supra basin 0.26 cm., 



