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348 



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349 



Figs. 342-349. — Pi mis Laricio: early stages in the development of the sporophyte; 

 the term proembryo applies to all the stages except that shown in the last figure; 

 fig. 342, the chromatin of the egg and sperm nuclei within the limits of the egg nucleus, 

 shown on a larger scale in fig. 333; fig. 343, first four nuclei of proembryo, also numer- 

 ous proteid vacuoles {p, pollen tube; n, cavities caused by inrush of contents of 

 pollen tube, or according to Miss Ferguson they are receptive vacuoles); fig. 344, 

 the four nuclei (two shown) dividing at base of egg; fig. 345, eight-celled stage; fig. 346, 

 somewhat later stage; fig. 347, last division of proembryo; fig. 348, the complete 

 proembryo, with four tiers of cells, four cells in a tier; r, rosette tier; s, suspensor 

 tier; fig. 349, suspensor tier beginning to elongate; figs. 342-344, from material 

 collected June 25; figs. 345-348, July 2; Xio4- 



