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The External Form of Plants. 153 
in the almond and walnut, dry and almost leathery. The 
drupe usually contains a single stone, rarely more as in the 
medlar, when the separate sections of which it 1s composed 
are called pyrenes ; it is usually unilocular, as in the peach, 
Fic. 324.—Lo- Fic. 325.—I. Longitudinal section through the unilocular drupe 
mentum of of the peach ; II. through the bilocular drupe of Cornus. 
fledysarunt. 
almond, and walnut, sometimes bilocular, as in the cornel 
(Fig. 325 11.) and coffee-berry. | 
In the Jerzy all the layers of the pericarp are fleshy and 
succulent, as in the grape, currant, and gooseberry (Fig. 
326) ; or the outer layers are harder, as in - 
the citron and gourd, [the latter some- 
times called a peso]. The apple is a berry- 
like pseudocarp. 
In the achene all the layers of the peri- 
carp are dry and nearly similar. It almost ,.. sas, Se 
invariably contains only a single seed, section through a goose- 
: . berry; the firmer outer 
and is usually also from the first uni- layer of the pericarp en- 
: -_ closes the succulent flesh; 
locular and with only one ovule, as 1M the seeds lie imbedded 
z : in the latter, and are at-: 
Stasses and Composite (Fig. B27); less Biched by long funiculi 
mequently i bceqmes umilocular’ in’ the ‘ive oppesHs Be, 
course of development, by the abortion | 
of some of the ovules and the disappearance of some of 
the loculi, as in the oak and alder. The pseudocarp of the 
