CRYPTOGAMIA. 375 



veil, of some of the genera is like that of Mosses, 

 but usually bursts at the top. The barren flowers in 

 some are similar to the stamens of the last-mentioned 

 plants, as in Jungermannia, see Hedwig's Theoria, 

 t. 16* ; in others they are of some peculiar confor- 

 mation, as in Marchantia, EngL Bot. t.QlO, where 

 they are imbedded in a disk like the seeds of Lichens, 

 in a manner so contrary to all analogy, that bota- 

 nists can scarcely agree which are the barren and 

 which the fertile flowers of this genus. The four- 

 valved capsule of Jungermannia, with the veil burst- 

 ing at its summit to let the fruit-stalk pass, may be 

 seen in EngL Bot. t. 185, 186, which are both 

 frondose species, like J. epiphylla, .771, whose 

 calyx as well as corolla is evident ; and t. 605 

 608, which have apparently distinct leaves, like 

 Mosses, Anthoceros, t. 1537, 1538, is a curious 

 genus of the Hepaticce. Linnaeus comprehended 

 this Order under the following one, to which it is, 

 most assuredly, far less akin than to the foregoing. 



4. Algce. Flags. In this Order the herbage is fron- 

 dose, sometimes a mere crust, sometimes of a 

 leathery or gelatinous texture. The seeds are im- 

 bedded, either in the frond itself, or in some pecu- 

 liar receptacle. The barren flowers are but imper- 

 fectly known. Here we find that great natural 



* See also Mr. W. J. Hooker's valuable Monograph on Jungerman- 

 nia, 1. 13, where the anthers are ascertained to be membranous, dis- 

 charging the pollen at the apex. 



