Tilletia tritici, or the rough-spored variety, is the common stinking smut of the Pacific regions, while Tilletia foetans, or the smooth-spored species, is the one generally found in the eastern United States.

Tilletia tritici, or the rough-spored variety, is the common stinking smut of the Pacific regions, while Tilletia foetans, or the smooth-spored species, is the one generally found in the eastern United States.

Indusium fixed under the sporangia, appearing like a tiny green cup filled with spore cases.

The fertile fronds shorter, closely bipinnate with the pinnules rolled up into berry-like structures which contain the spore cases.

The sexual special cell is termed the spore.

Rejuvenescence gives rise to a swarm-spore or zoospore.

3. Free-cell formation forms the typical motionless spore of algæ and fungi.

Each of these parts then secretes a cell-wall and becomes free as a spore by the rupture or absorption of the wall of the mother-cell.

Some of these terminal cells push out a little finger of protoplasm, which swells, thickens its wall, and becomes detached from the mother-cell as a spore, here called specially a basidiospore.

These conidiospores sometimes at once develop hyphæ, and sometimes, as in the case of the potato fungus, they turn out their contents as a swarm-spore, which actively moves about and penetrates the potato leaves through the stomata before they come to rest and elongate into the hyphal form.

After a long period of rest, this zygospore allows the whole of its contents to escape as a swarm-spore, which after a time secretes a gelatinous wall, and by division reproduces the sixteen-celled family.

Here the first generation grows on barberry leaves, and produces a kind of spore called an æcidium spore.

Here the first generation grows on barberry leaves, and produces a kind of spore called an æcidium spore.

These æcidium spores germinate only on a grass stem or leaf, and a distinct generation is produced, having a particular kind of spore called an uredospore.

The uredospore forms fresh generations of the same kind until the close of the summer, when the third generation with another kind of spore, called a teleutospore, is produced.

The peculiarity of this asexual or spore-bearing plant is that it is parasitic on the sexual plant; the two generations, although not organically connected, yet remain in close contact, and the spore-bearing generation is at all events for a time nourished by the leafy sexual generation.

The peculiarity of this asexual or spore-bearing plant is that it is parasitic on the sexual plant; the two generations, although not organically connected, yet remain in close contact, and the spore-bearing generation is at all events for a time nourished by the leafy sexual generation.

The spore-bearing generation consists of a long stalk, closely held below by the cells of the base of the archegonium; this supports a broadened portion which contains the spores, and the top is covered with the remains of the neck of the archegonium forming the calyptra.

The spores arise from special or mother-cells by a process of division, or it may be even termed free-cell formation, the protoplasm of each mother-cell dividing into four parts, each of which contracts, secretes a wall, and thus by rejuvenescence becomes a spore, and by the absorption of the mother-cells the spores lie loose in the spore sac.

The spores arise from special or mother-cells by a process of division, or it may be even termed free-cell formation, the protoplasm of each mother-cell dividing into four parts, each of which contracts, secretes a wall, and thus by rejuvenescence becomes a spore, and by the absorption of the mother-cells the spores lie loose in the spore sac.

The characteristics, then, of the mosses are, that the sexual generation is leafy, the one or two asexual generations are thalloid, and that the spore-bearing generation is in parasitic connection with the sexual generation.

The spore produces the small green prothallium by cell-division in the usual way, and this completes the cycle of fern life.

Hence, by analogy with the product of fertilization of rhizocarp's, ferns, and mosses, it should develop into a spore bearing plant.

Indeed, when a plant has monoecious or dioecious flowers, the distinction between the asexual and the sexual generation has practically been lost, and the spore-bearing generation has become identified with the sexual generation.

Reproduction from an asexual spore.