166 
MR. H. N. RIDLEY ON PLANTS 
DENDROBIUM (0 APORUM) ATROPURPUREUM, Miq. Fl. Ind. Bot. iii. 644. 
Launch Camp, at sea-level. 
Distrib. Malay Peninsula and Islands. 
DENDROBIUM ($ GnasTIDIUM) Krossir, Ridl., sp. nov. 
Caules elongati, ad 20 cm. longi, 5-8 mm. crassi, paullisper complanati, vaginis 
tenuiter costatis tecti. Folia (sicca) papyracea, tenuia, elongata, lanceolata, com- 
planata, attenuata, carina inconspicua, 15 cm. longa, 2:2 cm. lata, vaginis 3 em. 
longis arcte caulibus adpressis. Flores bini. Bractee exteriores hemispherice, 
rotundate, 1 mm. long:e, interiores oblong», ovatze, apice rotundate, 7 mm. longs, 
7 mm. late. Ovarium cum pedicello 3 cm. longo.  Sepalwm posticum lineare, 
obtusum, cucullatum, curvum, carnosum, papillosum, 1:6 cm. longum, 2 mm. 
latum, lateralia latiora 4 mm. lata, oblonga, obtusa, faleata; mentum breve. 
Petala oblanceolata, obtusa, 1 cm. longa, 3 mm. lata. .Labellum ungue brevi 
curvo canaliculato, lamina subquadrato-oblonga obscure triloba, lobis lateralibus 
brevibus eurvis obtusis, medio lato carnoso truncato apice lato ad margine undu- 
lato glabro ecalloso, venis 3 in medio prominulis papillosis. Columna brevissima, 
clinandrii lobis prominulis tenuibus. Anthera alta, conico-oblonga, apice rotun- 
dato retuso. 
Camp I, at 500 ft. 
Allied to D. imbricatum, J. J. Sm., but the plant is much larger, and the middle lobe 
of the lip broad and truncate, not abruptly acuminate. 
DENDROBIUM (f GRAsTIDIUM) VANDERWATERI, Ridl., sp. nov. 
Caulis bambusiformis, gracilis, 2 mm. crassus. olia lanceolata, longe acuminata, 
basi angustata, 11-12 cm. longa, 8-9 mm. lata, vaginis costatis cancellatis ore 
rotundis, cuspide brevi lanceolato, lamina opposita. Flores bini. Bractee pri- 
mari: semiovate, secundariz oblonge, lanceolate, eastanes, 1°5 em. longe, 3 em. 
late. Pedunculus 1 cm. longus, pedicelli 5 mm. longi. Sepala lanceolata, ovata, 
caudata, cauda filiformi, 2:5 cm. longa, basi 5 mm. lata; mentum brevissimum, 
rotundatum. Petala angustiora, basi lanceolato-linearia, apice filiformi-caudata, 
2 cm. longa. Labellum 5 mm. longum, citrinum, obcuneatum, trilobum, lobis 
lateralibus brevis obtusis, lobo medio oblongo obtuso eequilongo, ad basin labelli 
callo elongato lineari-oblongo pilis citrinis dense tecto. Columna brevis, cylindrica, 
alis brevibus clinandrii margine elevato. Anthera magna, depressa, conica, rostro 
oblongo obtuso. 
Camp VI a, 3100 ft. 
Near D. biflorum, Sw., which it resembles much in habit. 
DENDROBIUM ($ GRAsTIDIUM) DONACOIDES, Ridl., Sp. nov. 
Caulis bambusinus, elongatus, 4 mm. crassus, vaginis tectus. Folia tenuiter coriacea, 
lanceolata, acuminata vel elliptico-lanceolata et acuta, ecarinata, 11 cm. longa, 
