28 BOTANICAL GAZETTE [january 



gram 



much 



tetrad condition. The wings of Microcachrys 



With 



acquirement 



% 



three are more usual. When three only are present, it is the second 

 prothallial cell that has divided (fig. 7). The first and second 

 prothallial cells have walls which turn blue with chlor-iodide of zinc. 

 No further cellulose walls were demonstrated. Fig. 7, in addition 

 to the prothallial cells, shows a lateral derivative of the body cell and 

 the tube nucleus. The gametophytic structure thus conforms to 

 that which recent investigators have shown characterizes the related 

 forms. Perhaps it is not out of place here to give credit to Thibout, 3 

 the first person, so far as the writer knows, to describe and figure a 

 multicellular gametophyte in the Podocarpeae. 



form to the Araucarieae. He 



em 



tion to the supernumerary prothallial cells, there is a curious remi- 

 niscence of this group in the mode of pollination, the pollen sometimes 

 being deposited in the cavity around the ovule and growing over the 

 tissue into the micropyle, a condition which so far as can be judged 

 is essentially similar to that which I have found in Agathis. He also 

 calls attention to the wingless condition of the pollen in both Saxego- 

 thaea and the Araucarieae. 



With the present contribution our knowledge of the occurrence 

 o excess prothallial tissue in all genera of the Podocarpeae is com- 



plete. 



Microcachrv 



indefinite character, late in development, and undoubtedly of primi- 



carpus 



form occupying in this respect an intermediate 



Dacrydium 

 from 



three wings in some speeies of Podocarpns. TmeoOT describes the 



tr « "' Podoca 'P"' P'bstachya. 



s™-t m£ '" o™ ni ;,t r A" , :; c i lun8 von Sax,so,ha " compkua Uadl 



