Gastrornycetes 



II. CORTICATE. 



Tylostoma. (Plate CLXI.) 



GENUS VII. TYLOS'TOMA Pers. 

 Gr. a knob. 



Plants growing on the ground, oftenest in dry and 

 sandy regions. The genus is readily distinguished 

 from all others of the Lycoperdaceae by the entire 

 peridium being mounted upon the apex of the stem. 

 Morgan. 



The genus contains but few species. Those I have 

 found were not in condition to test. There is no re- 

 port upon the edibility of any. 



TYLOSTOMA 



MEYENIANUM. 

 (After Morgan.) 



GENUS VIII. CALVA'TIA Fr. 



Caivatia. Mycelium fibrous, usually thick and cord-like, rooting from the base. 

 Peridium large, globose and nearly sessile, or turbinate with a well-de- 

 veloped base ; cortex a very thin adherent layer, often smooth and con- 

 tinuous, sometimes composed of minute spinules or granules; inner 

 peridium a loosely woven and very fragile covering, after maturity 

 breaking up into fragments from above downward and gradually falling 

 away. Subgleba cellulose, mostly definitely limited and concave above, 

 persistent; mass of spores and capillitium dense, compact, persistent a 

 long time and slowly dissipating after the fracture of the peridium ; the 

 threads very long, slender, much branched and interwoven. Spores 

 small, globose, usually sessile or with only a minute pedicel. Morgan. 

 Puffballs of the largest size, growing on the ground in fields and 

 woods. Morgan. 



I. SESSILES. 



Peridium very large, without a distinct base ; subgleba nearly obsolete, 

 the mass of spores and capillitium quite filling the interior. 



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