28 
Brannon . — Grinnellia americana, Harv. 
auxiliary cell with companion-auxiliary cells (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 ( c ) 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 ( d ). sf, sterile filaments, and p, protoplasmic pits, x 725. 
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 
lucida from preparations of fresh material. 
