Viscum, called dryos hyphear, is most plentiful on the esculent oak, but occurs also on the robur, Prunus sylvestris and terebinth.
Hyphear is useful for fattening cattle if they are hardy enough to withstand the purgative effect it produces at first; viscum is medicinally of value as an emollient, and in cases of tumour, ulcers and the like.
They are very thick in Viscum album, and are well seen in Phaseolus inultiflorus and Lilium Martagon.
Occasionally there are numerous cavities in the anther, as in Viscum and Rafesia.
Cuscuta, Loranthus, Viscum, Thesiurn, Rhinanthus, &c.with various capac. ities for injury.