Jone, 1917.) THE ORCHID REVIEW. 125 
identified with C. ventricosum, Swartz (O.R., xviii. p. 215), and the 
parentage was ultimately confirmed by Mr. Scaplehorn, Messrs. Cutbush’s 
herbaceous foreman, who crossed C. macranthum with the pollen of C. 
Calceolus, and obtained seedlings identical in character (O.R., XVlil. p. 215). 
As to C. microsaccos, Krinzl., its history was given at page 268 of our 
twenty-third volume, at which time we only knew it from description. 
We have since found in the Herbarium a dried specimen collected in 
mountain forests in 1889, at Nertschinsk, Dahuria, by F. Karo (n. 125), 
and labelled C. Calceolus, L., which we think may represent C, 
microsaccos. It closely resembles a small C. Calceolus in shape and 
colour, but the lip, as dried, only measures 1} centimetres long, the size 
described by Kriinzlin. We find no other specimen like it, yet it is very 
nearly allied to C. Calceolus, if not actually a mountain form of it. 
Nertschink is a locality to the east of Lake Baikal, and the River Tirma, 
where C. microsaccos was collected, is rather further eastward. It is 
significant that the same collector (M. Docturowsky) also collected C. 
Calceolus X% macranthos at the river Tirma, and that both, together with 
C. Calceolus and C. macranthum, are recorded in the same paper by 
Kranzlin. Apart from the white ground colour, however, Mr. Elwes’ plant 
can hardly belong, for it has a lip about twice as long, though the sepals 
and petals are narrow. Of this the lip is white, and the sepals and petals 
are white, with a faint tinge of green, and we can scarcely imagine an 
albino of C. Calceolus losing the yellow of the lip, whatever might be the 
case with the sepals and petals. We cannot recall any white-lipped variety 
among normally yellow species. 
The question, perhaps, remains whether there may not be a white-lipped 
Cypripedium allied to C. Calceolus that is still imperfectly known. There 
are three species with normally white lips in different geographical areas. 
€. cordigerum, Don, is a native of the temperate Himalaya, extending 
from Kashmir to Kumaon at altitudes between 7000 and 11000 feet. It has 
light green sepals and petals and a white lip, but in every other respect 
closely resembles C. Calceolus. Probably the nearest ally of the preceding 
is C. candidum, Willd, a native of north-eastern America, which has very 
similar colours, but a rather smaller flower. And C. montanum, Dougl., a 
native of north-western America, combines a white lip with purple-brown 
sepals and petals, the general resemblance to C. Calceolus being most 
marked. It is curious how various closely allied species are scattered about 
in different geographical areas, and affords the most unmistakable evidence 
of descent with modification under varying conditions. 
There is one other Siberian species that should be mentioned, namely, 
€. guttatum, Swartz, a charming little plant characterised by its single 
flower, blotched all over with red-purple on a white ground, and in having 
