— 40 - 



angulum rotundato-acutum faciente, parallelo gynostemio porrecta, gyno- 

 stemium longe superante et partim includente, ungue oblongo, concavo, 

 basi medio tantum affixo et utrinque rotundato, c, 0.175 cm. longo, basi 

 0.125 cm. lato, mesocliylio obovato, apice utrinque obtusangulo (lobis 

 lateralibus). ciliolato, c. 0.4 cm. longo, 0.34 cm. lato, epichylio (lobo inter- 

 medio) porrecto, recto, triangulo, obtuso, carnoso, carina conspicua longi- 

 tudinali instructo, c. 0.22 cm. longo, 0,18 cm. lato. Gynostemium ultra 

 médium in brachia 2 parallela late oblique oblonga obtusa extus 

 oblique costata intus concava divisum, dorso convexum, c. 0.2 cm. 

 longum. Anthera cucullata, bene semielliptica, subselliformis, apice 

 late obtuse conico-gibboso-producta, basi bilobula, lobulis retusis, 

 connectivo basi late obtuse gibboso, bene 0.1 cm. lata Stigma longitudinale, 

 subovale. Pes gynostemii reversus, ovario adpressus, ^/s partibus superioribus 

 subrectangule incurvus, liiiearis, inexplanatus c. 0.25 cm. longus, parte 

 inferiore canaliculata, ciiiolata, parte superiore a sepalis lateralibus libéra, 

 crassiore, glabra. Ovarium sessile, curvatum, subadpresse subarachnoideo- 

 pilosum, c. 0.6 cm. longum. Capsula subfusiformis, obtusa, basi sensim vel 

 subabrupte contracta, obtuse trigona, 6sulcata, costis 3 latis rotundatis et 

 3 angustioribus planis vel leviter concavis, c. 1.6—1.8 cm. longa, 0,3— 0,35 

 cm. diam. 



Sumatra: Agam, Batang Paloepoeh. (W. Groeneveldt, cuit, sub n. 104). 



An ally of C. graminca Bl., from whicli it may be distinguished easily 

 by its much shorter rhizome, narrow leaves, longer peduncles, more eloiigated 

 lip, differently shaped anther. 



The petals are thickened upwards on the inner surface. 



Description from a living plant and spécimens preserved in alcohol. 



<5 Ceratostylis (sect. Pleuranthemum) J a c o b s o n i i J. J. S. n. sp. 

 Rhizoma dependens, ramosum, subteres, c. 32 cm. longum, vaginis 

 tubulosis acutis carinatis tenuiter promiiiule reticulato-venosis superioribus 

 accrescentibus omnino tectum. Gaules c. 2 cm. distantes, erecto-patentes 

 vel subadpressi, abbreviati, teretes, c. 0.4—0.5 cm. longi, 0,25 cm. diam., 

 Ifolii. Folium ovatum ad lanceoîato-ovatum, oblique obtusum, basi brevis- 

 sime contractum conduplicatumque, in utraque parte sulci longitudinalis 

 convexum, costa média dorso tenuiter prominente, crasse carnosum, rigidum, 

 c. 3.2 — 4.3 cm. longum, 1.75—2,1 cm. latum, vel etiam 4.5— 5.5 cm. longum, 

 1.4-1.8 cm. latum ; vagina petioliformis, conduplicata, basi brevissime tubulosa, 

 c. 1 cm. longa. Infloresçentiae ad apicem caulium ante folium fasciculatae, 

 Iflorae, pedunculo c. 0.35—0.6 cm. longo. Bractea oblonga, acuta,c. 0.24 cm. 

 longa. Flos mediocris, c. 0.9 cm, longus, 1.1 cm. latus. Sepalum dorsale 

 oblongum, apice recurvulum et leviter convexum, obtusiusculum, dorso 

 adpresse pubescens, 5nervium, c, 0.625 cm. longum, 0.3 cm. latum. Sepala 

 lateralia lacinia oblique ovali valde concava ad pedem gynostemii decur- 

 rentia, mentum reversum ovario adpressum inflatum a dorso compressum 



