332 



ATKINSON— MORPHOLOGY AND 



[April 23, 



level palisade organized in this region over the upper surface of the 

 stem. 



Similar sections of Coprinus micaceus^^ through the region of 

 the attached gills was one of the features contributing to the in- 

 correct interpretation, by Levine, of the origin of the lamellae in this 

 plant, as shown by his Figs. 13 and 14. The palisade cells on the 

 sides and in the upper angle of these pigeon holes could easily give 

 the impression that the gills had their origin from isolated radial 

 areas of new growth of palisade cells, these areas, or " ridges " of 



Diagram 6. Zenith view in a basidiocarp of tlie same age as that repre- 

 sented in diagram 5. See text for details not marked in the diagram. 



palisade cells parting as they increase, forming a lining over the 

 ground tissue or partitions of these little stalls, and thus enclosing 

 " the notch between the gills." 



Relation of the Gills to the Involute Margin of the Pileus. — 

 There are other pecuhar situations presented in the development of 



33 Levine, M., " The Origin and Development of Coprinus micaceus," 

 Am. Jour. Bot., i, 343-356, pis. 124, 125, 1914. 



