Fig. 128. Some stages in development of endosperm in Thesium montanum (A,B) 

 and Balanophora abbreviata (C-F). A, Thesium; l.s. ovule, showing cell formation 

 in primary micropylar chamber, while chalazal chamber remains undivided and 

 forms large haustorium. B, l.s. central placenta, showing extent of growth of 

 chalazal haustorium; somewhat diagrammatic and drawn at a much lower mag- 

 nification than A. (After Schulle, 1933.) C, Balanophora; upper part of embryo 

 sac, showing micropylar endosperm chamber with zygote, and a portion of chalazal 

 endosperm chamber. D-F, same, showing cell formation in micropylar endosperm 

 chamber, while large chalazal chamber (not shown in figures) remains undivided. 

 (After Zweifel, 1939.) 



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