although they did not include a cross between 0. 
gloriosum and O. Lindleyanum, an instance might be 
anticipated, and a plant which flowered in 1904 in the 
collection of Mr. W. Thompson, Walton Grange, Stone, 
exhibited characters that led Mr. Stevens, his gardener, 
to conclude that it must be this natural hybrid. The 
characters of the plant induced Mr. Rolfe to adopt the 
conclusion of Mr. Stevens and to describe the form as 
QO. praevisum. In order to confirm the parentage of 
the supposed hybrid, an opportunity was taken to cross 
O. gloriosum and O, Lindleyanum. Several seedlings, of 
which O. gleriosum was the seed-parent, were secured, 
and the first of these to flower did so at Kew in March, 
1915, when our drawing was made. As compared with 
the natural hybrid, that now figured has a brighter yellow 
ground-colour, and shows more of the influence of the 
female parent. It is of interest to note that O. Wilcke- 
anum, Reichb. f., a natural hybrid between O. crispum 
and QO. luteopurpureum, and O. Conradinei, Reichb. f., a 
natural hybrid between 0. crispum and O. Lindleyanum 
have now both been raised artificially ; also that 
QO. Adrianae, Lindl., a plant from another locality in 
Colombia, where 0. crispum grows in company with 
O. Hunnewellianum, Rolfe, has been shown by Mr. Rolfe 
from crosses effected at Kew to be a natural hybrid 
between these two species. Cultivated under the con- 
ditions suitable for its parents, 0. praevisum thrives as 
satisfactorily as they do. | 
Description.—Herb, epiphytic. Pseudobulbs clustered, ellipsoid-oblong, 
2-3 in. long, 1-1} in, wide, 2-foliate. Leaves ligulate, rather blunt, recurved, 
10-12 in. long, 1-1} in. wide, Inflorescence lateral, panicled, 12-16 in. long, 
many-flowered ; bracts ovate, very concave, about } in. long; pedicels slender, 
about ¢ in. long. Flowers medium-sized, yellow with brown blotches. Sepals 
and petals spreading, lanceolate, acuminate, somewhat wavy, 1-1} in. long. 
Lip wide-clawed ; claw erect, hollow conduplicate, 2 in. long; limb spreading, 
deltoid-ovate, slightly concave, very acuminate, margin wavy, tip recurved ; 
disk with an erect 2-lobed puberulous crest. Column clavate, 2in. long; wings 
falcate-linear, acuminate, about 2 in, long. 
Tas, 8780.—Fig. 1, lip; 2, column, showing the falcate wings :—both enlarged. 
