242 Explanation of Plates. 



PLATE XL. 



[All Figures x 500 unless otherwise stated.) 



SOROSPORIUM. 



Fig. 



107. Spore-ball of S. enteromorphum . . . . . . . . . , x 250 



108. Spores of same. 



109. Spore-balls of S. cryptum . . . . . . . . . . x 250 



110. Spores of same, from Panicum bicolor, showing finely- warted surface, 



111. Spores of same, sectional view. 



112. Spores of same from Panicum effusum. 



113. Spore-balls of 8. panici-miliacei from C'hamaeraphts spinescens ... x 200 



114. Spores of same. 



