Refugiun Botanicum. | . (June, 1869. 
TAB. 80. 
Tribe VANDE. 
Genus Potystacuya, Hook. 
P. rinzata, Rehb. fil. MSS. Pseudobulbis pyriformibus, basi vaginatis, 
foliis geminis usque octonis, lineari-ligulatis, apice acute bidentatis, 
pedunculo simplici (semper?) inflorescentiam usque ancipiti, vaginis 
ancipitibus imbricatis vestito, pedunculo florifero crasso clavato, 
puberulo, racemoso, alabastris ac floribus cum ovariis calvis angu- 
latis, bracteis minutissimis triangulo-lanceis, mento obtusangulo, 
sepalis oblongo-triangulis, tepalis angustioribus linearibus angus- 
tioribus brevioribus, labello cuneato-oblongo trilobo, lobis lateralibus 
obtusangulis, lobo antico porrecto triangulo acuto recurvo, tumore 
baseos elevato conico farinaceo, toto disco farinaceo, apicem usque 
versus, columna trigona utrinque juxta foveam angulata, fovea 
oblonga. 
Introduced to the Saundersian garden from Guatemala. We 
never saw the plant before. 
Pseudobulbs pyriform, furnished with sheaths. Roots very long, 
thick, deflexed. Leaves two to eight, linear-ligulate, minutely 
and acutely bidentate at the apex. Peduncle simple, ancipitous, 
with ancipitous, acute, long, imbricate sheaths, the floriferous 
part thickened, clothed with short hairs. Buds or perigones of 
the open flowers angulate with the hairless ovarium, greenish, 
with four cinnamon linear broad lines. T'epals narrower, linear, 
acute, shorter, greenish, with cinnamon borders. Lip cuneate- 
oblong, three-lobed, the side lobes obtuse, the middle lobe 
longer, lgulate-acute, the apex recurved. A mealy conical 
tubercle at the base of the lip, and all the surface nearly to the 
apex mealy: this meal consists of the broken cellules of nearly 
moniliform hairs. Column short, trigonous, angulated at each 
side of the oblong fovea. Anther mitrate, with an elevated middle 
ridge. Pollinia depressed-oblong, placed in two incumbent pairs 
on a short broad caudicula with a transverse glandula. 
Materials :—See following variety. 
Tab. 80.—Plant. 1, flower on part of peduncle, side view + ; 2, flower, 
front view +; 3, side view of a flower, sepals and tepals removed + ; 
4, lip +; 5, column, front view + ; 6, pollmarium +.—//. @. Ti. /. 
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