Rich ground in fir woods or their borders. Autumn. Oregon. _Dr. H. Lane._ This is a large and interesting species, well marked and easily recognized by its large size, by the greenish tint that pervades the pileus, lamellæ, annulus and stem, and especially by the large persistent patch of grayish-white felty material that covers the center of the pileus and sometimes extends nearly to the margin. This is in fact the upper part of the ruptured volva that is carried up by the growing plant, and is very suggestive of the specific name. In the young state the plant is entirely enveloped in the volva, which then is similar to a goose egg in size and shape, and its walls are one-fourth to one-half inch thick. So thick and firm are they that the young plant appears sometimes to be unable to break through and it decays in its infancy. Dr. Lane says that, having found that the Italians made use of this mushroom for food, he began eating it and introducing it to his friends, and he learned by personal trial that it is a thoroughly good and wholesome mushroom, which, when broiled with bacon, fried, baked or stewed, may be eaten with perfect safety and that it is a nutritious food. _Peck_, Bull. Torrey Bot. Club, Vol. 27, January, 1900. =A. crenula´ta= Pk. =Pileus= thin, broadly ovate, becoming convex or nearly plane and somewhat striate on the margin, adorned with a few thin whitish floccose warts or with whitish flocculent patches, whitish or grayish, sometimes tinged with yellow. =Lamellæ= close, reaching the stem, and sometimes forming decurrent lines upon it, floccose crenulate on the edge, the short ones truncate at the inner extremity, white. =Stem= equal, bulbous, floccose mealy above, stuffed or hollow, white, the annulus slight, evanescent. =Spores= broadly elliptic or subglobose, 7.5–10µ long, nearly as broad, usually containing a single large nucleus. =Pileus= 2.5–5 cm. broad. =Stem= 2.5–5 cm. long, 6–8 mm. thick. Low ground, under trees. Eastern Massachusetts. September. _Mrs. E. Blackford_ and _George E. Morris_.