344 MR. HENRY RIDLEY ON ORCHIDEZ AND 
recto integro; pollinia 4, elliptica; discus oblongus, tenuis. 
Rostellum planum, latum, bifidum. 
Hab. Siam: Pungah, C. Curtis! 
This plant has much the habit and appearance of the 
Singapore species, P. singapurensis, but differs in the sepals 
not being bullate, and in the form of the lip, which in this 
species has much shorter lateral lobes, and a broader rounded 
mid-lobe with sinuate edges. 
POLYSTACHYA PENANGENSIS, Ridl., sp. nova. Pseudo-bulbt 1 poll. 
longi, conici. Folia 5, 4 poll. longa, 14 poll. lata, lanceolata sub- 
acuta, disticha, inequalia, apiceineequaliter biloba. Panicula 6 poll. 
longa, stricta, erecta; vagina basalis 2 poll. longa; rami 1 poll. 
longi. Bractew cum } parte ovarii sequilonge, lineari-setaces. 
Flores parvi, bullati, flavescenti-virides. Sepalum posticum 
lanceolatum acutum, lateralia triangularia acuta. Petala 
sepalis multo minora pallidiora, spathulata, obtusa. Labelli 
lobi laterales breves ovati falcati, medius vix longior ovatus 
obtusus intus pubescenti-flavus, in medio bruneo-lineatus. 
Columna brevis, crassa. Anthera lata, oblonga; pollinia 
globosa. P. zeylanica, Lindl., Bot. Reg. (1838) Misc., p. 78, 
pro parte ? 
Hab. Penang: Government Hill ! 
This is allied closely to Lindley’s P. zeylanica, and may 
indeed be perhaps eventually reduced to a form of the Ceylon 
plant. The lip, however, seems to me different in form. 
Lindley’s description, 1.c., included both the Ceylon species and 
the Dendrobium polystachys, Thou., Orch. Afr., t. 85, that is, 
Polystachya mauritiana, Spreng., Syst., iii, p. 742. 
Sustrinse SARCANTHEZ. 
This large section of Vandew is a clearly-marked one ; dis- 
tinguished by its habit, absence of pseudo-bulbs, coriaceous 
narrow leaves, and lateral inflorescence. I would, however, 
exclude from it the South American genera Lockhartia (an 
Oncidea with the habit of an Aporum) and Centropetalum and 
Pachyphyllum (though the former of these has certainly the 
habit of Adenoncos), which seem to me to form a distinct group. 
The section thus curtailed is, with the exception of two 
American genera, closely allied to Angrwcum (Dendrophylax 
