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These aerial roots develop the velamen radicum, a spongy epidermis that traps the nutrient-rich flush during rainfall, representing an important adaptation of epiphytic orchids23, 24, 25.

As the barber, who was the most jealous of any sign of favour from the Cæsar, could find no fault with the velamen, he vented his anger upon Manlius' face.

It is sufficient to prove the fact that Erasmus did intervene, and commend to his Scottish friends a writer who represents Luther's translation of the New Testament, which more than any other book has made Germany what it is, as the "pabulum mortis, fomes peccati, velamen malitiae, praetextus falsae libertatis, inobedientiae praesidium, disciplinae corruptio, morum depravatio, concordiae dissipatio ... vitiorum scaturigo ... rebellionis incendium ... charitatis peremptio ... veritatis perduellio."

In de Corona militis, 4, after instancing Rebecca, he goes on to say of Susanna: "si et Susanna in iudicio revelata argumentum velandi præstat, possum dicere: et his velamen arbitrii fuit," etc.

Purple was the favorite color for this velamen, or veil; because, when the sun shone through it, it cast such beautiful rosy tints on the snowy arena and the white purple-edged togas of the Roman citizens.