[Classification of the Liverworts.]
CLASS HEPATICÆ.
510. Order Marchantiales.[26] —There are two families represented in the United States.
Family Ricciaceæ, including Riccia and Ricciocarpus.
Family Marchantiaceæ, including Marchantia, Fegatella (= Conocephalus), Fimbriaria, Targionia, etc.
511. Order Jungermanniales.[27]—There are two subdivisions of this order. The Anacrogynæ include chiefly thalloid forms with continued apical growth, the archegonia back of the apical cell. Examples: Blasia, Aneura, Pellia, etc.
The Acrogynæ include chiefly foliose forms, the archegonia arising from the apical cell and in such cases interrupting apical growth. Examples: Cephalozia, Frullania, Bazzania, Jungermannia, Ptilidium, Porella, etc.
CLASS ANTHOCEROTES.
512. The Anthocerotes have formerly been placed with the Hepaticæ as an order. But because of their wide divergence from the other liverworts in the development of the sexual organs, and especially in the structure of the sporophyte, they are now by some separated as a distinct class. There is one order.
Order Anthocerotales.[28]—This includes one family (Anthocerotaceæ) with Anthoceros and Notothylas in Europe and North America, and Dendroceros in the tropics. The latter is epiphytic.