CYCADALES 



65 



of mature plants. How far they extend was not determined. This 

 species also grows at Huatusco. Colipa and Mirador are also cited 

 as stations for species of Ceratozamia. 



Fig. 56. — Ceratozamia mexicana: on the steep mountain side opposite the e.xtinct 

 volcano, Naolinco, near Jalapa, Mexico (September, 1906). — .\fter Chamberlain."'' 



Microcycas. — This genus is monotypic, with Microcycas calocoma 

 as the only species, and western Cuba as the only locality. It is a 

 tall, arborescent form, often 2 or 3 meters in height, and occasionally 



