1913) BURLINGAME—ARAUCARIA BRASILIENSIS 99 
degeneration of the walls of the mother cells. At certain times in 
mid-winter practically all stages of the cones are present on the 
trees at the same time. Notwithstanding the fact just mentioned, 
stages between the prophase of the mother cell and tetrads were 
collected only four times, though diligently sought for. The same 
is true of the stages in the development of the gametophyte from 
mature microspores to those in which the primary spermatogenous 
Fic. 1.—Forest of Araucaria brasiliensis on the Rio Tibagy, State of Parana, 
southern Brazil -—Photograph by J. C. BRANNER. 
cell has already divided. The reasons for this state of affairs are 
not very apparent, though it may be that these stages are passed 
through very rapidly or that division occurs during the night. 
The habit of the tree is shown in text fig. 1, representing old 
trees in their native habitat, and in text fig. 2, an ovulate tree from 
the gardens at Linden Towers. 
The staminate cone 
Among the numerous specimens of Araucaria in these gardens, 
belonging to at least four different species, there are three staminate 
