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Flowers very small, on shorter pedicels; achene very dull and roughish, the sides sulcate.—An occasional escape from cultivation.

P. convex camp. firm, viscid, tawny yellow; s. white, apex sulcate, ring and below glutinous; g. adnate, broad, cinnamon, edge paler.

Stipe variable in length, sometimes very short or quite obsolete, occasionally a few of them confluent, wrinkled, and sulcate, brown below, paler or whitish above.

This species is very near M. rotula but it can be easily distinguished by the pale rufescent, distinctly sulcate pileus, and its growing on grass.

The margin is thin and marked by deep furrows and ridges, so that it is deeply striate, or the terms sulcate or pectinate sulcate are used to express the character of the margin.