- 43 - 



A detailed description of the lip, column foot and anlher of the latter spe- 

 cies is still wanting. 



Description from poor material preserved in alcohol. 



P 11 a j u s c a 1 I o s u s Lndl. Gen. et sp. Orch. (1821), 128; etc. 



var. s u m a t r a n u s J J. S. n. var. 



Pseudobulbi approximati, erecti, subcylindrici, paucinodes, atrovirides, 

 c. 6 cm. longi, 2.3 — 2.5 cm. diam , c. 3folii, basi noniiullis vaginis dona- 

 ti. Folia erecta, recurva, longe petiolata, obiongo-eliiptica, sensim longius 

 acuminata, acuta, basi acuta, longitudinaiiter plicata, nervis 9 siibtus prominen- 

 tibus, siibcoriacea, nitidule viridia, subtus opaca, ad c. 7C cm. ionga, 18 cm. 

 lata, vel etiam majora; petiolus canaliculatus, 3costato-angulatus, ciim vagina 

 c. 20— 27-cm. loiigus, liiflorescentia erecta, laxe c. Uflora. peduiiculo sectione 

 transversa subelliptico, viridi, c. 55 cm. longo, 0.8 cm. lato, vagiiiulis c. 6 

 tubulosis superne apertis et leviter inflatis ad c. 6 cm. longis donato, rachide 

 c. 21 cm. ionga. Bracteae caducae. Flores magiii, carnosi, c. 7.5 cm. 

 lati, sepalis petalisque patentissimis, intus nitide brunneis, basi margineque 

 flavis, dorso opacis, albis, anguste flavo-marginatis. Sepalum dorsale ob- 

 longum, apicem versus paulum dilatatum, breviter angustatum, subacutum, 

 concavum, dorso convexum cum sulcis 5 longitudinalibus plus minusve 

 conspicuis, c. 4.1 cm. loiigum, 1.5 cm. latum. Sepala lateralia patentissima, 

 oblique oblonga, apice brevi-triangulo-producta, acuta, concava, basi convexa, 

 dorso convexa cum sulcis 2 conspicuis nonnullisque levibus, margine an- 

 tico recurva, c. 3.8 cm. Ionga, bene 1.7 cm. lata. Petala oblique subspa- 

 thulato-oblonga, obtusa, apiculata, dorso longitudinaiiter sulcata, c. 4 cm. 

 Ionga, basi 0.45 cm., superne 1.5 cm. lata. Labellum basi longitudine c. 

 0.8 cm. gynostemio adnatum et margine puberulum, calcaratum, 31obum, 

 gynostemium aniplectens, costis 2 longitudinalibus approximatis sulco se- 

 paratis latis medio leviter concavis in medio laminae fere latissimis apicem 

 versus valde angustatis usque ad apicem productis interne mox evanes- 

 scentibus parce pilosis, basi intus villosum, subtus longitudinaiiter sulcatum, 

 basi crasse carnosum, album, basi intus flavum, striis c. 18 extrorsum 

 decrescentibus violaceo-maculatis, inexplanatum c. 4.5 cm. longum; lobi 

 latérales erecti, supra gynostemium contigui, antice vix producti, late ro- 

 luiidati, apice recurvuli, margine crenulati, gynostemium'superantes, superne 

 flavescentes; lobus intermedius porrectus, apice recurvo bilobus, lobis in- 

 curvis marginibus subtegentibus cucullum formantibus, margine recurvus, 

 pallide flavescens, basi subtus violaceus; calcar reversum, cum ovario 

 angulum acutum faciens, vix incurvulum, conicum, paulum a dorso com- 

 pressum, apice bilobulum, nitide flavescenti-album, c, 1 cm. longum, 0.575 cm. 

 latum. Gynostemium validum. leviter curvatum, trigonum, apicem versus 

 paulum dilatatum, dimidio inferiore subtus patentissime pilosum, album, 

 clinandrio minute violaceo-punctatum, subtus dimidio superiore niinute 

 violaceo-punctatum, dimidio inferiore fascia longitudinali punctata purpureo- 

 violacea notatum, c. 2.5 cm. longum, superne c. 0.8 cm. latum, clinandrio 

 alte excavato, apice truncato. Anthera cucullata, a dorso compressa, apice 



