334 THE ORCHID REVIEW. [NOVEMBER, 1912. 
ONCIDIUM TIGRINUM AS A PARENT. 
AT the present time, when Orchids are raised from seed with such striking 
success, it seems strange that comparatively little use has been made of 
the above species, but it is one of the easiest to obtain crosses from, and 
owing to its broad lip, should impart distinctive shape to hybrids derived 
from it. So far the only recorded hybrid from it seems to be O. hybridum 
(O.R., xviii. p. 8), the first garden-raised Oncidium, of which O. lamelli- 
gerum is the other parent. O. tigrinum being a great favourite, I have at 
various times made crosses with it, having obtained healthy seedlings when 
uniting with it Odontoglossum crispum, Harryanum and Wilckeanum, 
also Cochlioda Neetzliana. Last week I crossed it with Miltonia spectabilis 
var. Moreliana, and the cross appears to have taken. It is, however, a 
curious fact that I have never been successful in using it as the male 
parent, its pollen never seeming to have any effect when placed on the 
stigma of the various Odontoglossa. It would be interesting to know 
whether other seedlings of this species are in existence, and especially to 
know if anyone has crossed it with Oncidium crispum or its allies. 
: C. ALwyn Harrison. 
DISAS. 
ALTHOUGH upwards of 100 species of Disa are known to botanists, there 
are only about half-a-dozen in cultivation, for no one has up to the present 
been able to grow succesfully the grassy-leaved section, of which D. 
graminifolia may be cited as an example, or such as LD. crassicornis. 
The three species generally met with are D. grandiflora, D. racemosa, 
and D. tripetaloides, while D. sagittalis and D. polygonoides are also to be 
seen occasionally. From the three former several hybrids have been raised, 
such as :— 
D. Veitchii, racemosa x grandiflora. 
D. kewensis, grandiflora x tripetaloides. 
D. langleyensis, racemosa x tripetaloides. 
D. Premier, tripetaloides x Veitchii. 
D. Luna, racemosa X Veitchii. 
D. Clio, grandiflora X Veitchii. 
The hybrids, especially D. Veitchii and D. Luna, prove more amenable to 
cultivation than the species, but we believe that if their wants were more 
carefully studied all might be grown with a certain amount of success. In 
the following notes we shall endeavour to set out a method of treatment 
by which success can be attained, at any rate such plants as D. grandiflora 
and D. sagittalis, with D. Veitchii and other hybrids, flower annually, and 
increase their tubers. 
