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As in the nose, they have a punctiform, central, grayish, turbid portion, encircled by a more translucent ring, surrounded in its turn by a vascular area.

On the other, posterior, side of the grain is a more or less evident, sometimes punctiform, sometimes elongated or linear mark, the hilum, the place where the ovule was fastened to the wall of the ovary.

There may be a blood-stained discharge from the nostrils, and the mucous membrane thereof will often show punctiform hemorrhages.

Dirty white, quite pallid, gelatinous, punctiform, slightly undulated; consisting of erect simple threads; frequently there is a slight tinge of yellow.

Disc always open, at first punctiform, then dilated, convex or concave, naked.