178 MR. H. N. RIDLEY ON PLANTS 
PSEUDERIA NIGRICANS, Ridl., sp. nov. 
Planta habitu P. foliose (Brongn.), Schlechter, caule gracili 3 mm. crasso. Folia 
lanceolata, acuminata, acuta, basi rotundata, tenuia, (sicca atro-brunnea), 8:4 cm. 
longa, 1'5 cm. lata, costis gracilibus 3-5, vaginis 7-10 cm. longis costatis, ore 
integro. Racemi laterales, paullo infra os vaginze extruse, 1 cm. longi. Bractee 
oblonge, obtuse, imbricate, 2 mm. longs, plures. Pedicelli bini, patentes, 
graciles, ad 1-6 cm. longi. Sepalum posticum lineare, obtusum, carnosum, 12 mm. 
longum, 1:5 mm. latum, lateralia oblonga, lanceolata, carnosa, 2 mm. lata. Petala 
linearia, falcata, tenuia, 6 mm. longa, angustiora, nervo medio incrassato. Labellum 
ungue longiusculo, obovatum, 7 mm. longum, 93:5 mm. latum, carnosum, apice 
papillosum, marginibus undulatis, carina media fere ad apicem incrassata. Columna 
gracilis, areuata, superne vix incrassata, clinandrio haud profundo, marginibus 
elevatis. — Rostellum integrum, latum. Stigma oblongum, ventre canaliculato. 
Anthera lateraliter compressa, crista angusta in dorso convexa, loculis angustis. 
Pollinia elliptica, angusta. 
Camps IIT, 2500 ft., and VI æ to VITI, 8100 to 4900 ft. . 
This species has the habit and general form of the flowers of Dendrobium foliosum, 
Brongn. Voy. Coq., Bot. 208, t. 43 (Pseuderia foliosa, Schlechter), of which I have seen 
no type, but it differs in the papillose lip and in the shape of the anther, which is figured 
and described as acuminate. "The anther in this species is small, and laterally flattened 
with a narrow rounded crest running down the back, the anther-cells are erect, elliptic, 
parallel, and contain two pairs of closely appressed narrow elliptic pollinia. 
The plant referred by me to Eria foliosa in Forbes’s collection from Sogere in New 
Guinea, in Journ. Bot. xxiv. (1886) p. 326, is neither this plant nor the Dendrobium 
Joliosum of Brongniart. The column and anther resemble those of D. nigricans, but 
the lip is obovate with a very blunt papillose point, while the pedicels are much 
shorter, the flowers smaller, and the leaves broader. 
Dendrobium spinescens, Lindl. in Journ. Linn. Soc. iii. (1859) p. 14, which is given Lui 
Krinzlin as a synonym of D. foliosum, Brongn., is based on an extremely rough sketch 
by Reinwardt without details. Lindley saw no specimen of it, and the locality is 
doubtful. It differs entirely from the figure of D. foliosum, Brongn., in the flowers 
being apparently sessile, instead of long-pedicellate, and very much larger, with patent 
oblong obtuse petals and sepals. "The foliage and the form of the raceme resemble those 
of D. foliosum. I do not think it is possible now to guess what plant Reinwardt 
intended to figure, but it could not have been D. foliosum. 
Kranzlin, in * Pflanzenreich,’ iv. 50, rr. B, 21, classes D. foliosum, Brongn., and D. simile, 
Schlechter, in the section Eugrastidium of Dendrobium, from which he excludes all of 
Blume's species of Grastidium except G. rugosum. But Grastidium, if confined to the 
typical species and its allies, is to me a sufficiently distinct section, which I retain. It is 
characterised by its leafy stem with a short two-flowered raceme protruding through 
the leaf-sheath, and subtended by two pairs of bracts, one usually short and semi- 
orbicular, the other longer. Schlechter has made the genus Pseuderia for D. foliosum. 
