1909] CHAMBERLAIN—DIOON SPINULOSUM 409 
The ovulate cone is 
the largest yet known 
for any gymnosperm. 
In March, cones weigh- 
ing 14 kilos were not 
infrequent, and_ occa- 
sionally a cone had 
reached a weight of 15 
kilos. Since the seeds 
are not fully mature 
until October, it is safe 
to assume that the cones 
increase somewhat in 
weight after March, the 
time of my visit. The 
cone is cylindrical ovoid 
(jig. 4), its general 
habit distinguishing it 
at once from the ovoid 
cone of D. edule. It 
reaches a length of 50°™ 
and a diameter of 27°”, 
but the average cone 
is about 20 per cent. 
smaller than these meas- 
urements. 
The ovulate sporo- 
phylls are very hairy, 
as in D. edule and D. 
Purpusii, but are much 
more closely imbricated, 
there being no_ pro- 
jecting tips as is always 
‘ Fic. 4.—Dioon spinulosum; ovulate cone from a 
the case in the URES ee. ates at Tlacotalpam; x 4; November 1906. 
of 
D. edule and probably in D. Purpusii. In regard to the latter species, 
however, my statement is based upon only a single sporophyll. The 
