PSALLIOTA CAMPESTRIS 



393 



floor of the gill-chamber is actually in course of formation from the 

 sheath, and in which an inferior annulus can be clearly discerned. 



FIG. 140. Psalliola campestris. From a field at Redditch, 

 England. To show the occasional formation of an 

 inferior annulus in addition to the superior annulus. 

 A, a mature fruit-body, shedding spores, having a 

 superior annulus s, a slight inferior annulus i, and a 

 roughened area r. B, a diagrammatic vertical section 

 to indicate the mode of origin of a double annulus : the 

 velum has moved in the direction shown by the arrows 

 from its position, o, and has left a slight inferior ring, 

 i, behind. C, a very young fruit-body with the gills 

 filling the gill-chamber ; the velum is about to be pulled 

 outwards away from the stipe. D, the under surface 

 of a young fruit-body with the velum, v, closing the gill- 

 chamber ; st, the stipe. E, a young fruit -body which 

 has just formed an inferior annulus, i, but in which the 

 velum, v , still closes the gill-chamber ; r, a roughened 

 area formed by the pulling-away of the velum. F, a 

 vertical section through a young fruit-body showing 

 the gill-chamber closed by the velum which is being 

 pulled away from the stipe leaving a roughened area, r. 

 G, an external view of a young fruit-body. H, a vert ical 

 section of G, showing the velum forming the annulus ; 

 r, a roughened area like that of F. I, the under surface 

 of the pileus of Gand H, showing the gills, g, in the 

 gill-chamber through a rent in the velum v ; st, the 

 stipe, f natural size. 



