Filtered sun

Filtered sun [ Horticulture ]	Dictionary of botanic terminology - index of names
Synonyms: Filtered light, Dappled shade

A very bright environment that receive partially filtered sunlight, achieved through open-canopied trees or shading nets.

Filtered sun areas are never subjected to direct sunlight but receive only partially filtered sun.

Plant suited for filtered sun need bright exposure but thrive best in non-direct, screened, or filtered sunlight with eventually a few morning or late afternoon hours of sun or partial shade .
Most plants that tolerate full sun exposure are indeed much happier and grows better when they are cultivated in filtered sun as filtered sun will get enough sun to grow but will not be over exposed.

See also: Sun exposure, Full sun, Bright shade, Full shade, Half shade

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Holdfast roots [ Botany ]
Dictionary of botanic terminology - index of names

Some species of climbing plants develop holdfast roots which help to support the vines on trees, walls, and rocks. By forcing their way into minute pores and crevices, they hold the plant firmly in place.

Climbing plants, like the poison ivy (Toxicodendron radicans), Boston ivy (Parthenocissus tricuspidata), and trumpet creeper (Campsis radicans), develop holdfast roots which help to support the vines on trees, walls, and rocks. By forcing their way into minute pores and crevices, they hold the plant firmly in place. Usually the Holdfast roots die at the end of the first season, but in some species they are perennial. In the tropics some of the large climbing plants have hold-fast roots by which they attach themselves, and long, cord-like roots that extend downward through the air and may lengthen and branch for several years until they strike the soil and become absorbent roots.

Major references and further lectures:
1) E. N. Transeau “General Botany” Discovery Publishing House, 1994