978 raw roRK mate kusbum 



tough and flexible Inner membrane or peridium. With advanc- 

 ing age tins aaaumea a dull grayish blue or leaden hue and 

 opens by a small aperture at the top for the escape of the 

 sports. Anv sudden pressure applied to it at this time will 

 cause the ejection <>f a mass of its spores in little smokelike 

 puffs as in oilier puffballs. Occasionally old specimens are 

 found in which the inner peridium is almost black. The small 

 size, peculiar color and distinctly double coat of the immature 

 plant are characters which make this bovista easily recog- 

 nizable. Its flavor is much more agreeable than that of many^ 

 of the small species of the genus Lycoperdon. 



EXPLANATION OF PLATES 



PLATE K 



Clitocybe regularis Pk. 

 Rbgulab Clitocybe 



no. 



1 Immature plant 



2 Mature plant with convex cap 



3 Mature plant with nearly plane cap 



4 Vertical section of an immature plant 



5 Vertical section of the upper part of a mature plant 



6 Transverse section of a stem of a mature plant 



7 Four spores x 400 



Clitocybe subconcava Pk. 



SlJBOONOAVH CLITOCYBB 



8 Plant with the cap moist 

 :». in Two plants with caps dry 



11 Vertical section of the upper part of a plant 



12 Trans v. ction of a stem 

 L3 Four spores 100 



Hydnum umbilicatum Pk. 



tBILICATH ETDNT m 



1 1 immature plant Bhowing the upper surface of the cap 



l.". l •; Two mature plants Bhowing both surfaces of the cap 



17 Vertical Bection <>f the upper part of a plant 



i^ Pour spores •!<»<» 



