Hi Pheli,
In fact Bifr harrisoniae is epiphytic, but facultatively litophytic (rupiculous) in some conditions. Its 'cousin' Bifr thyrianthina is strictly litophytic. Both need more light than Cattleyas, you are right; but even in the cliffs where the litophytic Bifrenarias live is very humid at night, when the temp drops a lot (due fog formation). In the nature, the litophytic Bifrenarias are completely wet in the morning, mainly in the winter (the dry season, not much cold in Southeaster Brazil). If you want to copy their enviroment, try strong light (direct sun in the morning is wellcome) but take care with humidity in the dry season!(use at least sprays at night). In spring/summer rains a lot, and you could water their without problems.
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Frederico
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