Plate XIX; Figures 109 to 121; Magnified iooo 



Diameters. 



Fig. 

 Fief. 



100. 

 1 10. 



Cosmarium granatum Breb. 

 crenatum Ralfs 

 Cosmarium sp. ( ?) . 

 Cosmarium sub orbicular e Wood 

 & . .^. sp. ( ?) . 



Figs. 115, 116 



Figs, in, 112. 

 Fig 113. 

 Fig. 114. 



Cosmarium Botrytis Menegh. 



Fig. 



1 1 



/ 



Cosmarium coutractum Kirch. 



Figs. 118, 119. Sphcerozosma Hliforme Rab. . 

 Fig. 120. Sphcero'zosma spinulosum Delp. ( ?] 

 Fig. 121. Xanthidium fasciculatum var. sub- 



alpinum Wolle . 



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 64 



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