_Hymenium_ concrete, superior, smooth, shut in while young by the margins of the receptacle; _sporules_ disseminated with elasticity or otherwise; _receptacle_ bowl-shaped, flat or concave; some of this tribe when young have an involucrum. GENUS 27. PEZIZA. Series ALEURIA. Subgenus MEGALOPYXIS. Esculent species: _P. acetabulum_. [In Genera 28 to 45, which conclude the first great division, _Hymenomycetes_, there are no esculent species.] DIVISION II. GASTEROMYCETES. _Bot. Char._ The _receptacle_ a close cavity with or without a hymenium; _spores_ at last free and variously disseminated. [In Genera 46 to 73 there are no esculent species.] GENUS 74. BOVISTA.[152] _Bot. Char._ _Peridium_ papyraceous, furnished with a distinct back, which at length peels off altogether, fertile within; _capillitium_ equal. Esculent species: _B. plumbea_. GENUS 75. LYCOPERDON. _Bot. Char._ A sessile _peridium_, membranaceous; at first filled with a white, consistent, homogeneous substance, which after a time is converted into a dust of various hues, and is interspersed with copious filaments. The funguses of this genus are invested in two membranes; the innermost of which, or _peridium_, is tough and smooth on the outside, shaggy with floccose threads within. The external membrane, which is very fragile and tender, frequently falls off during the maturation of the seed, which then escapes through the peridium by an irregular orifice at the apex. Esculent species: _L. plumbeum_ and _Bovista_. DESCRIPTION OF SPECIES. AGARICUS PRUNULUS, _Vitt._ PLATE I. FIG. 1. Subgenus TRICHOLOMA, _Fries_. Subdivision PERSONATA, _ibid._ AGARICUS MOUCERON, _Bulliard_. _Cæsalpinus_, p. 617. MOUCERON GRIS, _Paulet_, _Persoon_. “Cogitatione ante pascuntur succineis novaculis aut argenteo apparatu comitante.”—_Pliny._ “Tout ce qui fait l’ornement des festins s’embaume du parfum de ces cryptogames.”—_Persoon._