{ The Rhizogens are a collection { of anomalous plants, { mostly leafless and parasitical, { having the loose cellular organ- { ization of Fungi, although { traces of a spiral structure are { usually found among their { tissues. Some of them spring { directly from the shapeless cell- III. RHIZOGENS { Fructification { ular mass which serves at once { springing from { for stem and root, and seems { a Thallus. { to be analogous to the Thallus { of the Fungi. Their flowers { resemble those of more perfect { plants; their sexual organs are { complete, but their embryo, { which is without any visible { radicle or cotyledon, simply { appears to be a spherical or { oblong homogeneous mass. { In Endogens the embryo IV. ENDOGENS { Cotyledon single. { has but one cotyledon; the { Permanent woody { leaves have parallel veins; the { stem confused. { trunk contains bundles of spiral { Leaves parallel- { and dotted vessels, surrounded { veined. { by wood cells, arranged in a { confused manner. V. DICTYOGENS { Cotyledon single. { Wood of the stem, { Dictyogens are distinguished { when perennial, { from Endogens by the stems, { arranged in rings { which have concentric circles, { concentric with { and the leaves which fall off { the veined pith. { the stem by a clean fracture. { Leaves netted. VI. GYMNOGENS { Cotyledons, two or { more. Wood of the { Gymnogens are Exogens { stem in concentric { which have no style or stigma, { rings, and youngest { the reproductive organs being { at the circumfer- { so constructed that the pollen { ence. Seeds quite { falls immediately upon the { naked. { ovules.