DEVELOPMENT OF BASIDIOCARPS AMONG AGARICS 35 S 



H 



Fig. 139. Diagrammatic sections of developing basidiocarp of Psalliota 

 campestris. A. Undifferentiated egg. B. An annular cavity has formed, 

 marking the site of developing lamellae. C. Pileus and stipe have developed 

 to the extent of being evident. D. Expanding pileus with inner veil rup- 

 tured to expose the lamellae. E. Detail of cavity, as in B, with downward- 

 coursing hyphae at the ceiling. F. Detail of these same hyphae, as in 

 C. G. Later stage in growth of gill that extends into the cavity. H. Bit 

 of mature hymenium and subhymenium. 



