290 BIOLOGY. 



course of the sap corresponds to the aqueous process ; 

 they are aquatic, just as the brown fungi are terrestrial, 

 plants. Their component parts are aqueous, indifferent, 

 mucous, and filose. Their habitation is the water itself 

 or bogs. If they occupy dry situations, they live only 

 when it rains. 



1549. They likewise pass through the five stages of 

 vegetation, and form therefore five orders. 



1550. Order 1. The lowest or Tissue- mosses, correspond- 

 ing to the Uredines ; are again naught but cells or mucous 

 pellicles, but, from growing in water, and being con- 

 sequently exposed to light and a stronger oxydation, they 

 are green Treni ellin i. 



1551. They multiply by subdivision, since new vesi- 

 cles or granules are developed in their interior, which 

 become separated, and subsist or continue to grow for 

 themselves. They therefore originate also by sequivocal 

 generation, but by such an one as constantly occurs in 

 water and light. 



1552. The second order, or the Vascular mosses cor- 

 responds to the sheaths, or to the Hyphoinycetes. They 

 are long filaments replete with granules, growing in 

 water, and therefore green Confervacea. These plants 

 begin to ramify, and either increase by this means or by 

 effusion of granular matter. 



1553. The third order, that of the Trachea! mosses, 

 corresponds to the stem, or to the Gasteromycetes. A 

 membranous trunk originates in water, which in certain 

 places secretes the seeds in special vesicles or cysts 

 Fucales or connate Confervse. The fuci have at once the 

 form of a stalk with root and leaves, because they corre- 

 spond to these three organs of the axis. 



1554. The fourth order, the Floral mosses, endeavours 

 to obtain the blossom, and therefore elevates itself out of 

 the water, but loses on that account the trunk-like 

 character, and exhibits for the most part only mem- 

 branous expansions, upon which seeds are secreted, 

 which being usually of a beautiful colour, thus assume 

 the appearance of corollae Lichenales. The lichens are 



