SS ee ee 
esas Se eee genet 
1894. ] ' The Evolution of the Hepatica. 349 
types of the Hepaticz.! It would be even less a misrepre- 
sentation of the Musci to make its representatives in An- 
dreaea, Phascum or Buxbaumia than to place Marchantia or 
any of its allies as a normal representative of the Hepatic. 
Armed, however, with such a conception gained from the 
elementary texts and emphasized by the works of reference 
usually accessible in an ordinary laboratory, as for example 
Kny, Strasburger, Sachs, and Goebel, the student goes forth 
into the field to study liverworts and after he has exhausted 
Marchantia and Conocephalus, and has possibly seen a Ric- 
cia, he is usually stranded and knows not what to seek. In 
fact, many are more likely to confuse some such thallose 
lichen, as Peltigera, with liverworts than to look for them 
among leafy forms which their training has not rendered them 
able to properly correlate. The Lophocoleas, the Cephalo- 
zias, the Frullanias and the Radulas, so elegant in their 
structure as to impress the least zsthetic student with their 
beauty, so diversified in their evolution as to demand the ex- 
ercise of his most active powers of reflection, and withal so 
simple in structure as to render them accessible with a mini- 
mum of microscopic technique—these are a closed volume to 
him because of the limitations of his early instruction and im- 
pressions, 
mediate from the structural standpoint, but in its relation to 
the evolution of the higher plants it stands as a key or link 
between the lower and simpler and the higher and more com- 
plex. The group is not a compact one nor are its component 
8roups closely united to each other. It is even to be doubted 
. 4 §00d reason exists for the separation of the bryophytes 
into the two classes Musci and Hepatic, and it would be 
hazardous to attempt their separation as coordinate groups 
®n any rational grounds, even if we leave in question their 
relation to the Sphagnaceze. ee 
‘The relative extent of the Jungermaniacez as developed by modern explor- 
i d subsequent study can be seen in a comparison of a few representative 
Species described in Species Bin ogo 
Metzgeria Synopsis Hepaticarum 1844-47. Schi . 
Lophocolea.""""""*77#*ettteeeees Bs senenenateeestnnssnenest 
PR ne cio ES ay ee ee 483 
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