ON HEPATIC/E. 



291 



order. Calyx, perianth, corolla, perichsetial leaves and ex- 

 terior calyx, change places in an extraordinary manner in the 

 writings of eminent cryptogamists. 



In one instance the capsule of Anthoceros is described as 

 pedunculated, and the cellules of the surface as furnished with 

 a spore in the centre, neither of which correspond with my 

 own observations, neither have I observed that the sporules are 

 ever attached to any part of the capsule. The perianth of 

 Targionia becomes an involucrum in Jungermannia ; the term 

 perianth being applied to the inner involucrum, becoming calyx 

 in the description of Marchantia conica, which I may here 

 remark, would be sufficiently characterised as a distinct genus, 

 by the male receptacles being sessile, and the peduncles of 

 the female ones furnished with one groove. The application 

 of the term stipulae to the third series of leaves in this genus 

 appears to me as unnatural, as its applications to similar parts 

 in Musci, on which I have elsewhere remarked. 



In the otherwise excellent Musci Exotici, in the descrip- 

 tion of Jungermannia Phyllanthus t. 95, the calyptra is said 

 to be a corolla. The term too, perichsetial leaves, is not as 

 appears to me, strictly applied, for in the frondose species they 

 become the exterior calyx. 



Sprengel in Lunularia turns the capsules into calyces, while 

 in Fimbriaria they become the involuera. But it is quite 

 useless to aduce further examples. 



I shall now proceed to notice the genera which occur in 

 the collection. 



Of Jungermannia 31 species exist, I may remark that the 

 separation of this genus into a distinct order, as has been 

 done in Dr. Lindley's excellent Nixus, will not in my opinion 

 hold good, at least on the grounds there mentioned. But 

 whether the separation may not with property be adopted on 

 account of the genus being vaginulate, is another question. 



In the character of Marchantia, I have described the peri- 

 anth of Dr. Hooker as the inner involucrum, as it seemed 

 to me the most consistent course. The term involucrum is 



