ORCHIDACEiE 



52. MICROSACCUS BL 



No members of this small genus have previously been found in 

 Borneo. 



I. Microsaccus longicalcaratus A. ^S. sp. nov. Herba pro 

 genere robusta. Caules plus minusve arcuati, saepissime furcati, 

 vaginis foliorum imbricatis complanatis omnino obtecti. Folia 

 numerosa, perdensa, disticha, equitantia, a latere visa lanceolata, 

 obliqua, leviter falcata, deeurva. Inflorescentiae in visu uniflorae, 

 in axillis foliorum superiorum. Flores parvi, in sicco pellucidi. 

 Sepala lateralia lanceolata, obliqua, apice cucullata. Sepalum 

 dorsale oblongo-ovatum, acutum, concavum. Petala Hnearia, ob- 

 tusa. Labellum calcaratum; lamina unguieulata, suborbicularis, 

 utrinque late rotundata, antice in medio subito in apicem tri- 

 angularem contracta ; calcar cylindraceum, arcuatum, apice bilo- 

 bato. Gynostemium breve, crassum. 



Plant, for the genus, very tall and stout. Roots clustered at 

 the base of the plant, numerous, fibrous, flexuous, longitudinally 

 sulcate, ±.75 mm. thick. Stems up to more than 36 cm. long, 

 simple or usually once-forked, rarely with three branches, usually 

 more or less arcuate, entirely concealed by the leaves and imbri- 

 cating leaf sheaths. Leaves very dense and numerous, distichous, 

 equitant, spreading, about 1.5-2 cm. long, 5-6 mm. wide below, 

 viewed from the side lanceolate, very oblique, more or less de- 

 curved, obtuse, articulated with the complanate sheaths, rigidly 

 coriaceous but pellucid, more or less rugose and apparently very 

 thick and fleshy in the living plant. Inflorescences apparently 

 one-flowered, in the axils of the leaves, much shorter than the 

 leaves even in late development. Flowers small, pellucid in the 

 dried specimen, apparently dark-colored. Lateral sepals adnata 

 to the spur, about 5 mm. long, 2.5 mm. wide below the middle, 



lanceolate, very oblique, apex cucuUate and dorsally carinate, 



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