ORCHIDACEiE 



prope basim circiter 3 mm. in diametro, flores excedens, in sicco 

 glaucum, mox longitudinaliter sulcatum. Pedunculus rigidus, 

 leviter fractiflexus, vix 5 cm. longus, articulatus. Bracteae inflo- 

 rescentiag hyalinae albidae. Flores flavidi, non striati, circiter 1.5 

 cm. longi. Sepala lateralia oblique triangularia, acuta, mentum 

 obtusum circiter 5 mm. longum formantia, 8 mm. longa. Se- 

 palum dorsale oblongi-lanceolatum, obtusiusculum circiter 8 

 mm. longum, vix 3 mm. latum. Petala oblongi-lanceolata, acuta 

 ad basim apicemque attenuata, membranacea, 7 mm. longa, 

 circiter 2 mm. lata. Labellum 9 mm. longum, trilobatum, e basi 

 cuneatum; lobi laterales subtruncati, rotundati, obtusi, margine 

 leviter denticulati quam lobus medius multo breviores; lobus 

 medius oblongus, apiculatus, ad apicem paullo dilatatus, vix 

 5 mm. longus, prope apicem circiter 3 mm. latus, linear eleva- 

 tulse in disco 3, ad medium lobi medii fimbriatse. Gynostemium 

 brevissimum. 



Dendrobium Usterioides is a close ally of D. Usteri Schltr., 

 differing from it in the stouter pseudobulbs, and in having the 

 flower shoots much shorter than the fleshy leaves. In D. Usteri 

 the middle lobe of the labellum is oblong-quadrate, hardly if at 

 all dilated near the tip. In his field notes which accompany speci- 

 mens of D. Usteri Mr. Lyon wrote: "This Dendrobium in habit 

 of growth and leaf, but not in inflorescence, much resembles my 

 no. 22 [Z). Usteri]. Flowers paler yellow and exterior of perianth 

 veined with pale rosy lines." 



The immature pseudobulb and leaf are for the most part con- 

 cealed by about three loose, tubular, whitish sheaths, which soon 

 pass away (?). The mature pseudobulbs are yellowish, either wholly 

 or in part clothed with a closely appressed grayish covering. The 

 inflorescence is also covered with whitish or grayish sheaths 



[ 143 ] 



