This is a pretty accurate description. To my knowledge, generally they do not grow on rocks:
Laelia anceps in Nature. In its native habitat Laelia anceps grows on tree trunks or branches on the edge of forests at altitudes of 1500-2000 m. The plants are often exposed to full sun and strong winds, with hot days and cold nights. Summer (the main growing season) is very wet and the plants receive heavy rain each evening and remain wet overnight. The next morning strong winds and sunshine quickly dry the plants before rain falls again in the evening. By contrast, the weather is cool and dry in winter and the plants receive little water until misty rain arrives in spring. New growths begin at this time with the new flower spike emerging from the centre of the new growth during summer. The flowers open as the new growth matures in late autumn.
Cultivation of Laelia anceps. Based on the above information, it would seem reasonable to:
1. grow L. anceps on a mount (e.g. tree-fern slab or a rough, long-lasting branch of oak or Casuarina, in my experience, cork mounts do not suit L. anceps).
2. hang the plant where it receives good air movement and good light (30-50% shade in summer, less or none in winter).
3. water heavily in summer and early autumn, preferably in the evening, applying liquid fertiliser occasionally.
4. after the plant has flowered (usually in late autumn), water only occasionally until spring.
5. then mist the plant daily until new growth appears. At this stage begin the cycle again with heavy watering each evening.
Laelia anceps can also be grown in a pot, using coarse bark as the potting medium. Because each year's new growth is separated from the previous year's growth by about 50 mm on the ascending rhizome, the plant soon climbs out of its pot and the new roots hang over the edge. Although the plant grows happily like this, it soon becomes top-heavy and will then probably need to be broken up and repotted. The flowers are usually rose, pink, violet or white in colour, with a darker labellum carrying a central yellow spot. The tall stem usually carries two to six flowers. Chamberlain's variety has larger, more deeply coloured flowers than most.
(from an austrilian orchid society webpage)
and this from Internet Orchid species encyclopedia:
IOSPE PHOTOS
They don't like to stay wet.
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