ORCHIDACEjE 



54. Dendrochilum (§ Acoridium) reniforme sp. nov. Similitudi- 

 nem gerit cum D. microchilo. Radices fibratee. Pseudobulbi fusi- 

 formes, leviter fastigati, in sicco rugosi, conferti, juniores vaginis 

 mox in fibras solutis inclusi, 2.5-3 cm. longi, monophylli, oblique 

 ascendentes. Folium petiolatum, in sicco manifeste trinervium, 

 subchartaceum, rigidum, lineari-lanceolatum, obtusum, nervo 

 medio leviter prasdito. Totum folium usque ad 1 dm. longum. 

 Lamina 6-9 cm. longa. Petiolus gracilis, sulcatus, circiterl.5 cm. 

 longus. Pedunculi graciles, foliis longiores, usque ad 12 cm. longi, 

 inter pseudobulbos et bracteas racemi nudi. Racemus densiflorus, 

 arcuatus, usque ad 7 cm. longus. BracteEe inflorescentiae distichse, 

 late ovataa, 3 mm. longse, 3 mm. latse, margine irregulariter denti- 

 culato, hyalino. Pedicellus cum ovario bracteis multo brevior. 

 Flores parvuli, oblique ascendentes. Sepala lateralia lanceolata, 

 trinervia, acuminata, valde acuta, ad basim rotundata, 3.5 mm. 

 longa, 1.25 mm. lata. Sepalum dorsale simile. Petala oblongi-lan- 

 ceolata, acuta, manifeste uninervia in sicco, 3. 5 mm. longa, . 75 mm. 

 lata. Labellum reniforme, integrum, leviter retusum, apicula- 

 tum, latius quam longius, semitubulatum,marginibus lateralibus 

 erectis, .5 mm. longum, 1.5 mm. latum, tricallosum, calli minuti, 

 papilliformes, unus in depressione disci. Gynostemium sectionis. 



Remarkable among the species which it resembles closely in 

 habit in having a reniform entire labellum. The three calli on the 

 disc are very distinct, one being in the middle of the depression of 

 the disc and one on each side of the depression near its margin. 

 That Dendrochilum reniforme is a close ally of such species as D. 

 microchilum and D. tenue is clearly indicated by two slight in- 

 dentations on the labellum in front, which if sufficiently de- 

 pressed would give the characteristic three-lobed labellum of 

 the Acoridium section of the genus. 



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