B. tuberculatum, Col. in Trans. N.Z. Inst. xvi. (1884) 336, and xxii. (1890) 488.—Forming densely matted patches on the trunks or branches of trees. Pseudobulbs ¼–⅓ in. long, broadly oblong or nearly orbicular, almost smooth and unwrinkled when fresh, deeply rugose when dry, more or less clothed with white builate scales. Leaves solitary on the pseudobulbs, ½-lin. long, linear-oblong, acute at both ends, thick and fleshy, slightly concave above, midrib prominent beneath, striate, under-surface with minute whitish dots. Peduncles very slender, almost filiform, ½–¾ in. long, 2–4-flowered; pedicels short; bracts minute. Flowers ⅙ in. long, white with a bright reddish-orange lip. Upper sepal oblong-lanceolate, subacute; lateral larger, triangular, broad at the base. Petals triangular, much smaller than the sepals. Lip almost as long as the sepals, hinged on to the produced base of the column; lamina oblong-ovate or subhastate, truncate at the base, concave, very thick and fleshy, lower part of disc with 2 minute raised ridges. Column very short, stout, 2-winged at the top. Capsule broadly oblong, ⅙ in. long.— B. exiguum, Buck, in Trans. N.Z. Inst. xvi. (1884) 397 (not of F. Muell.).

North Island: Auckland—Kaitaia, R. H. Matthews! Lower Waikato, Carse! East Cape district, Kirk. Hawke's Bay—Petane, A. Hamilton! Wellington—Palmerston North, A. Hamilton! South Island: Nelson—Colling-wood, Dall! April–May.

A charming little plant. It was referred by Mr. Buchanan to the Australian B. exiguum, and no doubt is closely allied to it, principally differing in the smaller size and more compact habit, shorter peduncles, shorter and broader sepals and petals, and broader and thicker bright orange-red lip.

B. pygmæum, Lindl. Gen. et Sp. Orch. 58.—Minute, forming densely matted carpets on the trunks of trees or on rocks. Pseudobulbs ⅛–⅙ -in. diam., globose or globose-depressed, glabrous, much wrinkled when dry. Leaves solitary on the pseudobulbs, springing from a minute circular sheath, ¼–⅓ in. long, linear-oblong, obtuse, very thick and coriaceous, grooved down the middle and page 665minutely echinulate above, naked and longitudinally nerved beneath. Peduncles solitary from the base of the pseudobulbs, very short, ⅓–⅙ in. long, 1-flowered; bract minute. Flowers very minute, whitish. Upper sepal narrow-ovate, acute; lateral rather larger, broadly triangular. Petals shorter than the sepals, oblong, subacute. Lip clawed on to the projecting foot of the column; claw long; lamina ovate, obtuse, thickened, disc with indistinct ridges. Ovary broadly oblong, gibbous, minutely echinulate.—A. Cunn. Precur. n. 317; Raoul, Choix, 41; Hook. f. Fl. Nov. Zel. i. 240; Handb. N.Z. Fl. 263. B. ichthyostomum, Col. in Trans. N.Z. Inst. xxvi. (1894) 319. Dendrobium pygmæum, Smith in Rees Cyclop. xi. n. 27.

North and South Islands: From the North Cape to Otago; in the South Island chiefly on the western side. Sea-level to 1500 ft. November–February.

I do not see upon what grounds Mr. Colenso has separated his B. ichthyostomum. The type specimens in his herbarium appear to me to be typical B. pygmœum.