&fist; The subdivisions have been variously arranged. The
following arrangement recognizes four classes: --
I. Pteridophyta, or Vascular Acrogens. These
include Ferns, Equiseta or Scouring rushes,
Lycopodiaceæ or Club mosses,
Selaginelleæ, and several other smaller orders. Here
belonged also the extinct coal plants called
Lepidodendron, Sigillaria, and
Calamites.
II. Bryophita, or Cellular Acrogens. These
include Musci, or Mosses, Hepaticæ, or Scale
mosses and Liverworts, and possibly Characeæ, the
Stoneworts.
III. Algæ, which are divided into
Florideæ, the Red Seaweeds, and the orders
Dictyoteæ, Oösporeæ,
Zoösporeæ, Conjugatæ,
Diatomaceæ, and Cryptophyceæ.
IV. Fungi. The molds, mildews, mushrooms, puffballs,
etc., which are variously grouped into several subclasses and
many orders. The Lichenes or Lichens are now considered to
be of a mixed nature, each plant partly a Fungus and partly an
Alga.
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