148 THE ORCHID REVIEW. 
species when well cultivated, P. villosa, not exceeding four inches high, 
with its darkish flowers under the leaves; the curious P. sicaria, and 
finally the striking P. Scapha. They all thrive under similar treatment. 
It would be worth trying to cross such a variety as P. longissima with one 
of the coloured species of Masdevallia. The result ought to be interesting. 
Physosiphon is another pretty tropical American genus, represented in 
cultivation by only a few species. P. Moorei and Loddigesii are distinct 
varieties, free blooming and extremely easy to grow.  Restrepia 
ophiocephala is remarkably distinct from its allies, some of which are very 
charming little plants. 
Polystachya pubescens and zambesiaca are also showing for flower. 
The former is a free growing species when treated like Burlingtonia. P. 
laxiflora is a West Tropical African species now in flower. 
Scaphosepalum is closely allied to Masdevallia, under which the species 
were formerly classed. Some of them are very free blooming, and continue 
to flower for two or three months. They require the same culture as 
Masdevallia. 
Amongst warm house species, only a few are now showing, as the 
easily grown Bulbophyllum occultum, native of Mauritius, and the small 
Cirrhopetalum compactum, which, when grown in baskets, flowers annually. 
Cottonia macrostachya is a very curious species requiring the same treat- 
ment as Vanda. Ornithidium nanum is a tiny West Indian species which 
flowers regularly every year. Goodyera procera is a Tropical Asiatic species 
with spikes of minute white flowers. We hope to mention this subject 
again, when other interesting favourites are in flower. 
If any one desires to make a selection of these interesting little plants 
they will find abundance of materials to select from, among the genera 
Angrecum, Bulbophyllum, Cirrhopetalum, Megaclinium, and many others, 
both epiphytic and terrestrial, which would impart additional interest to 
their collections. 
OponTo. 
CALENDAR OF OPERATIONS FOR MAY. 
BY H. A. BURBERRY. 
THE summer temperatures should now be maintained, as a general guide for 
which the following figures may be of some assistance :— 
Coot House.—This department should simply be kept as cool as 
possible both day and night. Plenty of air admitted during the cool of the © 
night is most ail to this section of Orchids. Heavily shade from the 
sun, and dings moist by damping down at intervals. 
_ INTERMEDIATE, Ls eam Day, with sun heat, 75°; 
