PUFF-BALL FUNGI— GASTROMYCETES 163 



instances, the stem probably remains rudimentary until the 

 spores are matured, when it elongates for the purpose of raising 

 the peridium to the surface, thereby facilitating the dispersion 

 of the spores." x 



The subterranean Gastromycetes, which technically belong 

 here, are treated in the chapter on subterranean Fungi, because 

 of their similarity in habit and appearance ; but for all this 

 they must not be confounded, and cannot be if the fructification 

 is properly remembered. 



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1 Masse'e, ' ' Monograph of British Gastromycetes, " in Annals of Botany, vol. 

 iv. (1889), p. 11. 



