Although the species, owing to the difficulty of importing it alive, is still exceedingly rare in this country, it has already flowered in many of the principal collections, especially in those of Mr. Rucker, Mr. Basset, Mr. Day, and Mr. Dawson, of Meadow Bank near Edinburgh. With the last-named gentleman a panicle, with sixty flowers upon it, is now (April, 1864) in full beauty. Mr. Fitch's drawing was taken from an exquisite variety, of which Mr. Day is the fortunate possessor, and which he kindly placed at my disposal for the purpose of being figured in this Work. In the Plate the flower-spike is represented as panicled because such--as in the case of all the other varieties--is no doubt its normal state; as yet however racemes only have been produced. The treatment recommended for other _Odontoglossa_ (see under Plate I.) will suit _O. Pescatorei_, which is as easily managed as any of the genus. DISSECTIONS.--1. Lip, seen sideways; 2. Lip, front view: _magnified_. [Illustration] Plate VI [Illustration: Odontoglossum pendulum.] PLATE VI. ODONTOGLOSSUM PENDULUM. PENDENT-FLOWERED ODONTOGLOSSUM. O. (TRYMENIUM) pseudobulbis subrotundis compressis lævibus diphyllis, foliis oblongo-ligulatis obtusis racemo pendulo multifloro paulo brevioribus, sepalis oblongis obtusis petalisque conformibus subæqualibus, labello unguiculato reniformi basi excavato marginibus callosis, clinandrii alis lateralibus subtruncatis dorsalique rotundato denticulatis. ODONTOGLOSSUM CITROSMUM, _Lindl. Bot. Reg._ 1842, _Misc._ 68; 1843, _t._ 3; _Fol. Orch. n._ 59; _Warner's Select Orchidaceous Plants_, _t._ 28; _Lemaire_, _Jard. Fl._ _t._ 90. CUITLAUZINA PENDULA, _La Llace et Lexarza_, _Orch. Mex._ 2; _Reichenbach, fil._, _Bonplandia_, iii. 15, 16. Habitat in MEXICO, _Lexarza_, _Karwinski_, _Barker_. DESCRIPTION. PSEUDOBULBS _clustered together, 2 to 4 inches long, compressed, ovate or almost round, smooth and glossy, 2-leaved_. LEAVES _6 inches to a foot long, leathery, oblong-ligulate, obtuse, rather shorter than the raceme_. RACEME _issuing at an early stage from the young growth, pendulous, many-flowered, rarely branched, longer than the leaves_. SEPALS _and_ PETALS _similar in form, pure white, or in some varieties of a faint blush or rose-colour, frequently sprinkled with minute red dots, oblong, obtuse, about an inch long_. LIP _unguiculate, kidney-shaped, channelled (with the solid edges turned up) along its base, on which there is a patch of yellow, with a few bright dots in the position where a crest (here entirely wanting) is usually placed; the colour of the disk of the lip varies in different specimens, being sometimes entirely white and sometimes tipped with faint rose-colour or deep-crimson_. COLUMN _with upper and lower wings (all of which are toothed), that on the back being rounded and the others truncated_.