86 PRINCIPLES OF BOTANY, ETC: 
1. The claw, (wnguis), is the base of the petal, by 
be is attached to the receptacle. 
. he expansion, (lamina), the upper pene of the 
a down to the unguis. 
OS 2 
The corolla of the Mosses differs in external ap- 
pearance from that of all other plants. It has this 
remarkable peculiarity, that after flowering it remains 
tll the rypening of the fruit, but then appears under 
a quite different form. The female flower alone is 
furnished with a corolla. It consists of a pretty hard 
membrane that closely embraces the pistillum. — It is- 
fastened both above and below, and thus after 
flowering it must be detached and be designated by 
various names. ‘The under part perfectly resembles 
the vagina on the straw of the Grasses, and is in- 
closed by the perichetium ; it is called a sheath, (va- 
ginula). The upper part remains attached to the 
top of the fruit, and is called Calyptre, (calypira). 
This organ shall be more particularly mentioned 
Ly Sa 
§ 80. 
Botanists call the collection of small florets sihieh 
are contained In a common perianthium, a com- 
pound flower, (/los compositus s. corolla communis). 
Of these compound flowers there are the following 
kinds : 
I. A semiflosculous flower, (/los semiflosculosus), 
when the general flower consists intirely of tongue- 
shaped florets, (corolle ligulate), fig. 85, 270. 
! 2. A, 
