e. _O. macranthum_ is a cool-house
plant, and _O. crispum_, _O. Forbesii_, _O. concolor_, _O.
Marshallianum_ (illustrated in Plate VII.), _O. varicosum_, and others
also do well in the cool house in baskets or suspended pans. _O.
Papilio_, _O. Kramerianum_, _O. Lanceanum_, and _O. ampliatum_ should
have a position in the warmest end of the intermediate house. Pot the
plants as epiphytal Orchids. Withhold water for a time after growth is
completed.

~Paphinia.~--Small-growing epiphytes. Grow in baskets or pans in a warm,
moist house.

[Illustration: PLATE VIII

ODONTOGLOSSUM CRISPUM]

~Phaius.~--Strong-growing, terrestrial Orchids for the intermediate house.
Pot them according to the directions in the chapter on the potting of
terrestrial Orchids. The species are evergreen, and require but a short
resting season. They require shade.

~Phalaenopsis.~--These are warm-house species from the Philippines, Java,
Borneo, India, and other places. Pot the plants in Sphagnum-moss. They
succeed best when suspended, but if they are grown on the stage they
should be elevated on inverted pots. A moist atmosphere is essential.
_P. amabilis Rimestadiana_ will grow in the intermediate house; so will
also most of the other species, if placed in a moist corner.

~Peristeria.~--The genus is best known in gardens by _P. elata_ (Dove
Orchid). The cultivation is similar to that for Phaius.

~Physosiphon.~--A small genus allied to Stelis. _P. Loddigesii_ has
racemes of orange-coloured flowers.

~Platyclinis.~--These are pretty, intermediate-house Orchids, with
pendulous racemes of white or yellow flowers, generally fragrant.

~Pleione.~ _See_ ~Coelogyne~.

~Pleurothallis.~--A large genus of elegant, dwarf-growing Orchids for the
intermediate house.

~Promenaea.~ _See_ ~Zygopetalum~.

~Renanthera.~--These showy species are natives of Tropical Asia and
Malaya. They should be grown like Aerides and Vandas. _R. Imschootiana_
is a compact, free-growing species, with showy, crimson flowers.

~Restrepia.~--A cool-house genus usually grown with the Masdevallias, and
requiring similar treatment.

~Rodriguezia.~--This genus includes the species usually called
Burlingtonia in gardens. Suspend the plants in the intermediate house.
_R. secunda_ has rose-coloured flowers; most of the others are white,
and they are generally fragrant.

~Rhyncostylis.~--These are warm-house plants, which are known usually as
Saccolabiums in gardens. The com