18 THE ORCHID REVIEW. 
importation, which Messrs. Low, without knowing its name, considered 
might be a natural hybrid between the two species in question, and the 
subsequent identification of this plant with C. siamense put the whole 
matter in a totally new light. The accompanying illustration is reproduced 
from a photograph taken by Mr. I’Anson, and shows how well the characters 
of the two very distinct parents are combined in the hybrid, which is fairly 
intermediate in character. We may now ask some of our hybridists to 
demonstrate experimentally what must be obvious to every one. The 
experiment of crossing these two species together would be at once very 
simple and very interesting. 
C. CALLosuM (fig. 2) is a well-known plant, introduced from Siam, in 
1885, by M. Regnier, of Paris, and was described in the following year 
(Rchb. f., in Gard. Chron., 1886, ii., p- 326). It is closely allied to C. bar- 
batum and C. Lawrenceanum, but is readily distinguished by its falcate 
petals, and different foliage. 
C. APPLETONIANUM (fig. 3) is the mysterious second parent whose 
absence probably prevented Reichenbach from guessing the truth about 
what he called C. callosum var. subleve, and in any case his remark above 
cited is suggestive. Its original’ appearance is uncertain, and it would be 
interesting to learn whether M. Regnier did not actually obtain it in his 
original importation of C. callosum. Did no one flower supposed poor 
forms out of this importation which possibly were thought not to be worth 
keeping? The earliest record appears to be in 1893, when a plant flowered 
in the collection of W. M. Appleton, Esq., of Weston-super-Mare, said to 
have been introduced with C. Hooker, from which it was said to differ in 
the flowers, and in the absence of I 
in the leaves. It was described 
as C. Appletonianum (Gower, in Garden, 1893, i., p. 95), afterwards becoming 
C. Bulleni ar. Appl (Rolfe, in Orch. Rev., I., p. 135). It is 
probable that the recorded origin of this plant is erroneous. At all events 
it has been introduced in quantity by Messrs. Hugh Low & Co., from Siam, 
together with C. callosum. C. Poyntzianum (O’Brien, in Gard. Chron., 
1894, i, p. 36), which appeared in the collection of Reginald Young, Esq., 
of Liverpool, is identical, and also appeared among imported plants of C. 
callosum (Orch. Rev., IL., p. 54, IIL., p. 55): The botanical status of this 
plant is a little uncertain. The flowers are very similar to those of the 
Bornean C. Bullenianum, owing to which it was made a variety of it, yet 
the leaves are remarkably different, and as the new facts show that it is not 
an aberrant form of C. Bullenianum, as at first supposed, the best course 
seems to be to consider it a closely allied species, or what is often termed 2 
subspecies. A question of this kind can never be decided without a full 
knowledge of the facts, and a comparison with the allied forms. The leaves 
closely resemble C. callosum, The staminode is small, and the incurved 
a 
