THE SPERMATOPHYTES 457 
is crowned by a cluster of pinnately-compound leaves of a 
leathery texture. 
STAMINATE ConE.—The staminate cone of Zamia arises on the 
ends of short branches emanating from the end of the stem of 
& Se ee 
x 4. 
Fic. 344,—Mature sporophytes of Zamia bearing staminate strobili (cones). 
(Photograph by F. F. Bacon.) 
the male plant (sporophyte). Each consists of a central axis bear- 
ing compactly arranged microsporophylls. Each microsporophyll 
bears on its lower surface a large number of microsporangia. 
Within each microsporangium spore mother cells are developed, 
each of which by division form 4 microspores (pollen grains). 
