=A. tabula´ris= Pk.—relating to boards. =Pileus= 5–10 cm. broad, very thick, fleshy, firm, convex, deeply cracked in areas, whitish, flesh whitish, tinged with yellow, the areas pyramidal, truncate, the sides horizontally striate, their apices sometimes tomentose. =Lamellæ= narrow, close, free, blackish-brown when mature. =Stem= short, thick, solid. =Spores= broadly elliptical, 7.5–9µ long, 6–7.5µ broad, generally containing a single large nucleus. In clay soil by roadsides. Craig, Colorado. August. _E. Bethel._ This species is remarkable for the peculiar upper surface of the pileus which is broken into pyramidal areas. The sides of these are marked by parallel lines in such a way that they appear as if formed by small tablets placed one upon another, each successive tablet being a little smaller than the one immediately preceding it. Only dried and broken specimens have been seen by me and the notes of the collector do not give the color of the young lamellæ. There is a trace of a thick ring on the broken stem of one specimen. _Peck_, Bull. Torr. Bot. Club, Vol. 25, No. 6, 1898. Not elsewhere reported. Edible qualities not given. [Illustration] =PILOSACE= Fr. (Plate XCV.) [Illustration: SECTION OF PILOSACE ALGERIENSIS.] Hymenium differentiated from the stem. =Gills= free from the stem; general and partial veil both absent, hence there is no ring on the central stem. =Spores= purple-brown. A peculiar genus, with the habit of Agaricus, but without a trace of a ring. _Massee._ P. eximius Pk., 24th Rep. N.Y. State Bot., is the only species thus far reported in America. Edible qualities unknown. [Illustration] STROPHA´RIA. _Gr_—a sword-belt. (Referring to the ring.) =Flesh= of stem and pileus _continuous_. =Veil= present, when ruptured forming a distinct ring on the stem. =Gills= more or less _adnate_. On the ground or epiphytal. Separated from all the genera of the purple-spored series but Agaricus by the presence of a distinct ring, and from that by the continuity of flesh in stem and pileus, and by the gills not being free. =Pileus= somewhat fleshy, sometimes viscid. The species belonging to this genus are rather small, and from their habitats are frequently passed or overlooked. Yet many of them are common and plentiful. Those which have been tested are excellent and worth seeking in their season. The entire genus has been under a cloud. Writers upon it assert some of its members to be dangerously poisonous. So far as carefully tested by the writer no doubtful one has been encountered, and one—semiglobata—has been eaten by himself and friends since 1881, notwithstanding its dangerous reputation. The division between this genus and Agaricus is not always sharply defined. S. æruginosa, S. semiglobata and S. stercoraria were formerly placed in Psalliota, now Agaricus. ANALYSIS OF TRIBES.