28 Brannon. — Grinnellia americana, Harv. 



auxiliary cell with companion-auxiliary c^ls (i, 3, and 2). d, upper daughter- 

 cell bearing the ooblastema-filaments (sp) which develop whorls of sporiferous 

 filaments from central cells in the chain, pi, protoplasmic pits, sf, sterile 

 filament which develops from one of the auxiliary cells surrounding the central 

 one of the auxiliary group, x 725. 



Fig. 25. A somewhat later stage of the auxiliary cells than that shown in 

 Fig. 16. of, ooblastema-filament. pa, papilla from which other ooblastema- 

 filaments are to develop, x 725. 



Fig. 26. Transverse section of a semi-mature cystocarp. sp, dichotomous 

 sporiferous filaments which are abstricting young carpospores (f) from their outer 

 ends, cp, elliptical half mature carpospores. m, mature carpospores which were 

 separated from their parent sporiferous filaments and remained in the cystocarpic 

 cavity of the sectioned body, d, portion of the upper daughter-cell from the 

 central auxiliary cell (a), pa, papilla of cells which developed from the daughter- 

 cell (</). ^, sterile filaments, and/, protoplasmic pits. X725. 



All figures were drawn by the author. The third figure was drawn from an 

 herbarium specimen. All the others were drawn with the aid of the camera 

 luQida from preparations of fiesh material. 



