It consists of loose cellular tissue, and secretes a viscid matter which detains the pollen, and causes it to germinate.
Phoronis is often gregarious, the tubes which it secretes being sometimes intertwined in an inextricable mass.
Between the two middle toes, in most species, is lodged a deep glandular bag having the form of a retort with a small external orifice, which secretes an unctuous and odorous substance.
In function the perianth may be compared with a unilocular ovary containing a single ovule; the projecting integument, which at the time of pollination secretes a drop of liquid, serves the same purpose as the style and stigma of an angiosperm.
Mollat, Lettres secretes et curiales de Jean XXII.