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scrotiforme basi valde constrictum apice retusiim piibescens c. 0.35 cm. 

 longiim 0.17 cm. latiim formantia, divergentia. reciirvula, oblique oblonoa, 

 apicem versus angustata, obtusa, dorso pubcscentia, 5nervia, c. 0675 cm., 

 tota bene 1 cm. longa, 037 cm. lata. Petala sepalo dorsali et labello paral- 

 lela, oblique oblonga, apicem versus aiigustaia, obtusa, concava, dorso 

 convexa, margine interne minutissime papillosa, 3nervia, carnosula, apicem 

 versus incrassata, fere 0.6 cm. longa, 0.24 cm. lata. Labellum obtusano-ule 

 sigmoideum, concavum, subtus' convexum, unguiculatum, subtrilobum, 3ner- 

 vium, inexplanatum c, 0.85 cm, longum, ungue lineari-oblongo, concavo. 

 dorso ad basin longitudinaliter sulcato, inferne tantum pilis crassiusculis 

 subclavatis ciliato, intus carinis 2 parallelis pubescentibus in laminam 

 decurrentibus et evanescentibus donato, c. 0.3 cm. longo, 0.15 cm. lato, 

 mesochylio valde concavo, dimidio superiore medio incrassato, obtuse 

 3costato, explanato suborbiculari, fere 0.4 cm. longo, 0.5 cm. lato, lobis 

 lateralibus rotundatis, basi excepta dense breviter subclavato-ciliatis, lobo 

 intermedio cum lobis lateralibus angulos obtusos faciente, incrassato, trian- 

 gulo, subobtuso, c. 0.18 cm. longo, fere 0-1 cm. lato. Gynostemium brève, 

 latum, sinu transverse quadrangulo bifidum, c. 0.24 cm. longum, clinandrio 

 dorso retuso cum apiculo filamenti, brachiis porrectis, parallelis, late oblon- 

 gis, obtusissimis, extus couvexis, intus concavis. Anthera cucuUata, antice 

 rotundata, basi lata quadrilobulata c. 0.13 cm. lata. Pollinia 8, oblique 

 pyriformia, leviter compressa. Roslellum rotundato-excisum. Pes gynostemii 

 reversus, ovario adpressus, '/s superiore liber et obtusangule incurvus, 

 linearis, leviter canaliculatus cum costula longitudinali in parte libéra 

 Vformiter bicruri, mento multo brevior, c. 0.26 cm. longus. Ovarium teres, 

 dense adpresse lanato-pilosum, c. 0.5 cm. longum. 



Sumatra: Singgalang, 1800 m. (E. Jacobson, cuit, sub nrs 1345 and 1347). 



This species is an ally of C. graminea Bl., C. robuste HooK. F., 

 C. crassipetala J. J. S. etc. It is a robust plant, with very thick ovate or 

 ovate îanceolate leaves. The mesochyl of tlie lip is almost orbicular and 

 abruptly contracted in the claw; the ciliae of the lip are rather thickish. 



According to Mr. E. Jacobson the bract is transparently yellowish 

 green with a light brown reticulation, the pedicel and ovary iight green, 

 the sepals and petals light yellow with a greenish hue, lighter towards 

 the base, the lip light yellow, and the column transparently white with a 

 yellowish anther. 



Description from plants preserved in alcohol. 



Ceratostylis (sect. Pleuranthemum) t r i c a 1 1 i f e r a J. J. S. n. sp. 



Rhizoma elongatum, dependens, ramosum, omnino vaginis imbricatis 

 alternatim bifariis acutis superne accrescentibus tectum. Caules c. 1.2 cm. 

 distantes, brevissimi, subîeretes. c. 0.4—0.5 cm. longi, Ifolii. Folium cau- 

 lem continuum, laiiceolatum, apicem versus sensim acuminatum, acutum, 

 basi subacutum brevissime contractum conduplicatumque, supra leviter 



