448 



Sinai!, subqiiadrate, very slightly (about oae-eight part) loiiger 

 thau broad, constriction deep, linear, opeiiing widely ; sides and an- 

 gles rounded, ends very sliglitly rounded, alinosi fiat; sides with 

 about three uadulations, ends with four or five slight undulatious ; 

 surface faintly granulated, a slight centrai protuberaace above the 

 base with four perpendicular rows of about four small granules in 

 each ; side view of semi-cell globular, end view ovai, very slightly 

 prominent at the sides; zygospore globular with soraewhat long, ta- 

 pering, simple, acute spines. Length 2G-29 u..; breadth 23-27 a,; 

 isthmus 7-8 a.; diara. of zygospore 23-26 u..; do. incl. spines 42- 

 48 y.. 



Mesoiivmum De Greyii Turn. ist nach der Ansicht der. Verf. 

 eine Varietat {[^. «Greyii») von M. Braunii Bar. 



17. Verf. erwàlint ein Clostermm von Ancylistes Closlerii Phfz, 

 befallen. 



18. Entluilt Standorte fi'ir 9 hauflge Desraidiaceen. 



Qailo 28 Febr. i801. 



