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BRIEFER ARTICLES 



413 



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 CD 



c: 



hundred ovules germinated in 1906, the embryos bore only one cotyledon 

 (figs. 1,2,3). 



When the anatomical study was completed, a preliminary note was 

 received from Matte (4), who had germinated some seeds provided by 

 Chamberlain and had begun the study, not knowing that the work was 

 being carried on in this laboratory. Matte reports that the embryo 

 is monocotyledonous. Chamberlain (14) in his recent report on Cera- 

 tozamia, read before the Chicago meeting of the Botanical Society of 

 America, makes the same statement. 



Yig. 1. — Seedling of Ceratozamia showing base of the cot yledonary petiole encir- 

 cling the stem. Natural size. 



Fig. 2. — Cross-section of middle region of cotyledon. XS. 



Fig. 3. — Longitudinal section of seedling in the emergent stage: c, cotyledon; 

 s, scale; a, growing point of stem. X8. 



In other cycad embryos, the cotyledons are often reported as unequal 

 in size. Tretjb (5) observed and figured the inequality in Cycas circi- 

 nalis. Worsdell (6) described a seedling of Cycas revoluta in which 

 one cotyledon was considerably shorter than the other. Matte (7) re- 

 ports a case in Dioon edule in which the vascular strands in the smaller 

 cotyledon are reduced in number, only the rudiments of the missing ones 

 occurring at the base of the cotyledon. He also mentions an inequality in 



