Oncidium. 241 



parte tecta, ringentia. Labellum basi humeratum, breviter unguiculatura, lobi laterales 

 ligulati, apice rolundati, rectilinee divergentes, G ad 7 mm longi, 3 mm lati, lobus 

 intermedius breviter unguiculatus ,latissimus, reniformis, antice profunde partitus, utrinque 

 rotundatus, crista tuberculis 7 composita, ternis in utroque latere, 1 longiore in linea 

 mediana disci, interdum binis utrinque lateralibus, 1 utrinque divergente, 1 mediäno, 

 tota basis disci minute velutina, tolum labellum 1,2 cm longum et antice latum, luteum 

 excepta basi castanea. Gynostemium breve, rostellum parvum, subulatum, tabula infra- 

 stigmatica lata, protensa, utrinque obtusangula, a fronte visa fere rhombea, exeavata, 

 alae integrae, divaricatae, obtusae. — Fl. in Europa Octobri. 



Subäquatoriale andine Provinz. Peru (v. Warscewicz). — Nach kult. Ex.! 



Nota. 0. excavato Lindl. certe valde affine, differt colore florum castaneo, apicibus tan- 

 tum phyllorum lulescentibus. 



254. 0. excavatum Lindl. in Sert. Orch. (I 838) sub t. 25; Bot. Reg. (1839) Mise. 

 150; Paxton, Flow. Gard. I. t. 21; Lindl. Fol. Orch. Oncid. 27; Reichb. f. in Walp. Ann. 

 VI. (1861)742; Bot. Mag. t. 5293; Yeitch, Man. Orch. pl. VIR. 35; Gogn. Dict. Icon. 

 Orch. Oncidium t. 20 et in Fl. Brasil. III. 6. 363; Williams, Orch. Grow. Man. 7. ed. 609. ■ — 

 Oncid. aurosum Reichb. f. in Bonpl. II. (1 854) 1 08 ; in Walp. Ann 42 ; Illustr. hortic. (1870) 

 t. 34; Lindenia V. t. 221. — Pseudobulbi dense aggregati, interdum numerosi, rhizomati 

 intricato insidentes, 8 — 18 cm longi, basi 4 cm lati, ad 2 cm crassi, subcompressi, 

 monophylli, folia infrabulbosa 2. Folia omnia lineari-lanceolala, acuminata, infrabulbosa 

 ad 25 cm, illa pseudobulborum 30 ad 50 cm longa, 2 ad 2,5 cm lata. Panicula longe 

 peduneulata, scapus viridi-glaucus, validus, vaginulis paucis brevibus longe distantibus 

 praeditus, panicula valde ramosa, multiflora, satis densa, bracteae et ramorum et florum 

 parvae, lanceolatae, quam ovaria cum pedicellis 2 ad 3 cm longa multo breviores. 

 Sepalum dorsale obovato-oblongum, lateralia basin usque libera, ceterum aequalia vel 

 potius oblonga, paulo angustiora, apice rolundata, margine leviter undulata, 1,8 cm 

 longa, 1 ad 1,2 cm lata, lutea, maculis interdum dilatatis purpureo-brunneis decora. 

 Petala obovato-oblonga, sublongiora, magis undulata, apice rotundata, breviter unguiculata, 

 circ. 2 cm longa, eodem colore quo sepala. Labelli lobi laterales oblongi, rotundati, 

 lobus intermedius multo major, breviter unguiculatus, transverse oblongus, antice subbilobus, 

 basis labelli convexa, tuberculis minutis, in series subirregulares 4 dispositis onusta, 

 addita utrinque lamellula paulum prosiliente; totum labellum ad 2,5 cm longum, lobus 

 intermedius 2 cm latus, antice aureus, basi maculis purpureis signatus. Gynostemium 

 breve, alae pro rata magnae, dolabriformes vel subquadratae, anthera planiuscula, 

 lutea ut totum gynostemium. Flores expansi 4 ad 4,5 cm diametro, variant tarnen 

 magnitudine. 



Subäqatoriale andine Provinz. Peru, bei Ghachapoyas (Matthews); Ecuador 

 (Spruce); oberer Amazonenstrom (v. Warscewicz). 



Nota. One. aurosum Reichb. f. vix pro varietate aestimandum est, differt a typo solum- 

 modo floribus maxima pro parte luteis vel aureis, maculae vel vittae purpureae ad basin phyl- 

 lorum floris retraetae inveniuntur. 



255. 0. polyadenium Lindl. Fol. Orch. Oncidium (1855) 27; Reichb. f. in Walp. 

 Ann. VI. 743. — Habitu et statura, praesertim sicca O. excavato Lindl. simillima. 

 Inflorescentia paniculata, panicula contraeta, pyramidalis. Sepala petalaque retusa. 

 Labelli basis circularis, lobi laterales proprii nulli, toto margine lobulato, denticulato, 

 crenulato, isthmus subnullus, lobus intermedius reniformis, utrinque rotundatus, antice 

 satis profunde sinuatus, subbilobulus, crista convexa, papillis numerosis in series 5 

 dispositis composita, additis utrinque papillis numerosis sine ordine lamellisque 4 paulum 

 prosilientibus. Gynostemii alae ovatae, infra rotundatae, apice obtusae, leviter emar- 

 ginatae. — Flores ut videtur concolores lutei, illis O. excavati majores. 



Subäquatoriale andine Provinz. Peru (Lobb). 



Nota. Species mihi his ultimis annis non visa, diagnosis ex illa autoris et icone analytica 

 ejusdem. Differt ab O. excavato cui persimile floribus majoribus, panicula magis compaeta, 

 praeeipue forma generali labelli et cristae indole. 



A. Engler, Das Pflanzenreich. IV. (Embryophyta »iphonogama) .50. 16 



