270 THE VEGETABLE WORLD. 
relatively to the number of their spores, their solidity, their form, 
their equality as to size, the absence of all germinating faculty, are 
so many circumstances which seem to identify them with the 
attribute of being agents of fecundation analogous to the anthero- 
zoids of other Thallogens. But they possess, so far as is known, 
no organs of locomotion. 
Crass II.—Acrocens. 
So-called from their stems growing in height and not in diameter. 
They are flowerless’ plants, like Thallogens, the stems and 
leaves of which are distinguishable, and in other respects they 
approach closely to higher structural forms, even acquiring the 
stature of lofty trees in some of the orders. They have breathing 
pores, or stamatz, on their surface; their leaves and stems are 
distinctly separated in most of the species; in some of them the 
spiral spermatoids, which form an important portion of the 
internal anatomy of the higher forms of vegetation, are found well 
developed, and they are propagated by reproductive spores, but 
without any direct evidence that Acrogens possess organs requiring 
to be fertilised, the one by the other, in order to be reproa 
The Acrogens correspond with the Acotyledons of De Jussieu, 
the Cellulares of De Candolle. 
( Zur Merchantiacee, 
i keane { plunged i the sabstane of the frend, or ese | 
5 closed in a hood which serves as an invo-) yyryq, Equisetacer, oF horsetails. 
\lucre to t . XIX. Andree, or split meses 
XX. Bryacez, or 
. mos Z 
Vascular, with axillary or radical spore- { XXI. Lycopodiacee, a! poems tes 
cases, one or many-celled, spores of two sorts. | XXII. Marsilleacee, oF Pe 
XXIII ioglassacee, OF 
gars Vascular with marginal or dorsal spore- ag : sewn 
* 6. ALS, ~~ 4 cases, one-celled, usually surrounded by an< yyry, Polypodiacem, or em 
elastic rt. XXV. Danzacee, or D 
ring spore of one sort. : 
loose cellular 
their sides: 
5. LYCOPODALS. { 
Of the Muscals, Hepaticals or Liverworts have a 
texture, usually prostrate, and producing rootlets in 
they grow in damp places. Sometimes the stem and war : : 
unite and form a confluent expansion; in other cases 
points of structure in Hepaticer,” says Dr. Lindley, 
within the theca or sporule case, and having a strong 
spiral filament, as it is called, lying among the let i 
al worts. 
liverworts. 
eae 
