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BOTANICAL GAZETTE 



[FEBRUARY 



genus. The subject was mentioned to the students, and in a few days 

 Mr. Ivey Lewis found a tulip tree with very variable leaves, from 

 which we collected a number of forms. The tree was a fairly vigorous 

 one, about eighteen feet high, growing on the edge of an open field. 

 Fig. I is from a photograph of six selected leaves from this tree. The 

 type of variation represented by the two pointed leaves shown is of 



Fig, I.— Photograph of six leaves from a single tree of Liriodendron 

 Tulipifera. The tip of one leaf that was broken off after drying has been inserted in 

 the photograph. 



very rare occurrence in the living species, and apparently so far has 

 been described by Berry only (Torreya 2:33. 1902), As the leaves 

 of Liriodendron are usually considered remarkably constant to type, 

 it was thought that a photograph of such widely different forms pro- 

 duced on the same tree might be of interest. 



On the occurrence of two egg cells in the archegonium of 



Mnium, — Wh 



sectioning the female "flowers'' of an undeter- 



mined species of Mnium, collected near Baltimore in the spring of 



