96 



ORCHIDACEjE 



few specimens I have examined, I do not feel justified at present 

 in regarding these species as components of one polymorphic 

 species. The following supplement to the key will help to distin- 

 guish them : — 



Middle lobe shorter, or only slightly longer, than the laterals. 



Median callus, if present, obscure. D. simulacrum. 



Median callus conspicuous. D. pumilum. 



Middle lobe longer than the laterals. D. affine. 



18. D. HUTCHINSONIANUM sp. nov. Aff. D. Philippi- 

 nensi, sed in membris omnibus major. Radices crassse. Pseudo- 

 bidbi elongati, graciles, paulatim fastigati sursum, 7.5-8 cm. longi 

 in maturitate. Folium oblongi-lanceolatum, obtusum, 12.5-16.5 



cm. longum, 1.8 cm. latum. Petio- 

 lus gracilis, 3-3.5 cm. longus. Pe- 

 dunculus a pseudobulbis immaturis 

 ortus, bracteis tubularibus et folio 

 convolute vaginatus, ± 9 cm. longus, 

 racemum riorum magnorum carneo- 

 rum gerens. Bractece glumacese, 5 

 mm. longae, pedicellum cum ovario 

 excedentes et basim floris amplec- 

 tentes. Flos explanatus 9 mm. latus. 

 Sepala lateralia ovata, ± 5 mm. 

 longa, 3.5 mm. lata ad basim, 3-ner- 

 via. Sepalum super ius oblongum, 

 obtusum, 5 mm. longum, 2.5 mm. 

 latum. Petala cuneato-ovata, obtusa, 

 5 mm. longa, 4.5 mm. lata, 3-nervia. 

 Labellum crassum, 3-lobatum ; lobi laterales ± 2 mm. longi, .75 

 mm. lati, lineari-falcati, obtusi, lobo medio breviores; lobus medius 

 subcordatus, acuminatus, ± 2 mm. longus, 2 mm. latus, prope 

 basim bicallosus, et callo medio vel mammilla instructus. Co- 

 lumna crassa, 1.5 mm. longa, utroque prope turgum sulcata. 



D. Hutchinsonianum belongs in the same group with such spe- 

 cies as D. philippinense, D. recurvum, and D. pumilum. It is by 



Dendrochiltjm Hutchinsonianum 



