40 $ 
NATURAL HISTORY, 
females ; of which there are two, viz. Fraxinus, Ash, and Gleditsia,* 
Tbree-thomed Acachin. 2. By hermaphrodites and males; of 
which there are, viz. Diospyrus, Indian Date Plum, Nyssa, Dupelo 
Tree, and Pisonia, Fringrigo. 3. By androgynous and males ; of 
which there are five, viz. Anthospermum. Amber Tree, Arctopus, 
Panax, Ginseng, Chrysitrix, and Stilbe. 
Order III. TRIOECIA, comprehending such plants as have 
the polygamy on three distinct plants. This order contains two 
genera, viz. Ficus, Fig, and Ceratonia, Carob Tree, or St. John’s 
Bread. 
Of the twenty-fourth Class, Cryptogamia. t 
This class consists of such plants as conceal their fructification, 
having their flowers either within the fruit, or so small, as not to be 
perceptible to the naked eye. The fructification of these is also of 
an uncommon structure. The orders are four, viz. 
Order I. FILICES, Ferns, comprehending such plants as are 
odorisiferous.J What is known of the fructification of these plants, 
amounts only to the few characters following. 
Character of the Filices. 
CALYX. — A squama growing out of the leaf, opening on one of 
its sides ; and under which there are pedunculate globules ; each 
globule is girt with an elastic ring, which breaks elastically, ana 
shods a dust, which are the seeds. 
This order contains eighteen genera ; which, not admitting of any 
certain distinction from their fructification, have been ranged by 
Linnaeus according to their situation under their covers, and are as 
follows, viz. Cvcas, Sego Palm, Zamia, Quistetum, Horse Tail, 
Onoelea, Sensible Polypody, Ophioglossum, Adder’s Tongue, 
Osmund, Royal, or Flowering Fern, Acrosticum, Forked Fern, 
Pteris, Braks, or Female Fern, Blechnum, Hcmionitis, Mule’s Fern, 
Lonchitis, Rough SpleenWort, Asplenium, Spleenwort, or Milt- 
waste, Polypodium, Polypody, Adianthum, Maiden Hair, Tricho- 
manes, Marsilea, Pilularia, Pepper Grass, and Isoetes. 
Order II. MUSCI, Mosses. The character of the plants 
comprehended under this title are, anther® without filaments ; the 
* In gleditia the hermaphrodites and males are on the same plant, and 
the females on a distinct one. 
+ The plants of this class are often of a dangerous quality. 
J Bearing the fruit on the back of the leaf. These have been called aiso 
epi-pltyllospermous, a Greek compound, expressive of the same circum- 
stance ; capillary, as being esteemed good for the hair ; and caules. with- 
out stems ; for in these plants, what rises out of the ground is plainly a 
leaf only ; one of the characters of a stem or trunk is to be alike on every 
side ; but in the stalks of ferns, there is manifestly a front and back, the 
former being flat and channelled, and the latter convex ; which shews 
them to be leaves. 
