dently belongs to sect. Cultriformes being a close relative 
to P. tenuissima Kraenzl. 
Polystachya (§. Cultriformes) tenella Swmmer- 
hayes sp. nov.; affinis P. Mildbraedii Kraenz\. et P. an- 
gustifolae Summerh., ab illa floribus multo minoribus, 
ab hac labello Jatiore, ab utraque habitu et praesertim 
pedunculo graciliore, floribus magis congestis, labello ex 
ungue angusto subcordato-triangulari fere integro dis- 
tinguitur. 
Herba epiphytica, 25-86 em. alta; caules gracillimi, 
laxe caespitosi, fere erecti, teretes, leviter longitudinali- 
ter striati, 5-15 cm. longi, 0.5-2 mm. diametro, apice 
monophylli, inferne cataphyllis tubulosis + arcte tunicati, 
radices flexuosas emittentes. Moliuwm erectum, lineare vel 
ligulato-lineare, obtusum, leviter bilobulatum, 10-20 em. 
longum, 2-5.5 mm. latum. Inflorescentia gracillima, folia 
fere aequans vel superans, simpliciter racemosa vel ramu- 
lis paucis instructa; pedunculus 10-18 em. longus, basi 
fere 1 mm. diametro, basi vagina arcta tunicatus; pars 
florifera 1-5 em. longa, usque ad 15-flora, ramulis sub- 
erectis usque ad 1.5 cm. longis; rhachis flexuosa; bracteae 
1-2 mm. distantes, ancipites, e basi lata acuminatae, 1-2 
mm. longae. Fores erecto-patentes, partim lutei partim 
purpuret; pedicellus 1.5—2 mm. longus; ovarium 1.5 mm. 
longum. Sepalum intermedium oblongo-ellipticum, ob- 
tusum vel rotundatum, 2.8-38.5 mm. longum, 1.8—2 mm. 
latum, trinervium; sepala lateralia oblique triangularia, 
subacuta, 3.5-4 mm. longa, cum pede columnae mentum 
obtusum 2.5-83 mm. longum formantia. Petala anguste 
ligulata, subacuta, 2.6—8.2 mm. longa, 0.4—-0.5 mm. lata, 
uninervia. Labellum ex ungue angusto leviter concavo 
0.7-1 mm. longo subcordato-triangulare, fere integrum, 
lobis lateralibus vix distinctis rotundatis, apice obtusum, 
totum 8.5-4.2 mm. longum, 2.5-8 mm. latum, ecallo- 
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