Feb., 1913.] 
The Classificatian of Plants, VIII. 
75 
2. Plants consisting of minute, distinct cells with walls, or with the cells 
arranged in simple or branched filaments; the cells sometimes in a 
gelatinous mass; often ciliate; nuclei poorly differentiated. 
SCHIZOMYCETAE. 3. 
2. Plant body of minute distinct cells in a pseudoplasmodium, the whole 
mass motile; fruiting bodies of definite form somewhat like the 
sporangia of slime molds; saprophytes. 
Myxoschizomycetae. Myxobacteriales. 
2. Plant body of oval or elongated, comparatively large, nonmotile cells 
which increase by budding; commonly present in sugary solutions 
and fruit juices causing alcoholic fermentation. Saccharomycetales. 
2. Plant body when mature consisting of cells in a sack-like structure; 
usually parasitic in the cells of algae, pollengrains in water, and 
occasionally in the cells and tissues of higher plants. 
Archemycetae. Chytridiales. 
2. Plant body a motile plasmodium of naked cells, the fruiting stage 
usually a so-called sporangium, usually without cell structure 
excepting the spores within; saprophytic, rarely parasitic. 
Myxomycetae. 4. 
3. Cells spherical, rod-shaped, curved, or spiral, free or in simple or loose 
aggregates or filaments, motile or nonmotile, some with cilia or 
flagella; not with a purple pigment in the protoplasm. Bacteriales. 
3. Cells spherical, rod-shaped, or spiral, containing a purple pigment 
called bacterio-purpurin. Rhodobacteriales. 
3. Cells in filaments surrounded by a sheath, or filaments without a 
sheath but with active movement by means of an undulating cell 
membrane. Desmobacteriales. 
4. Parasitic in the cells of living plants, the cells forming a plasmodium; 
the fructification consisting of a mass of free cells. 
Plasmodiophorales. 
4. Saprophytes developed on decaying organic matter. 5. 
5. Amoeboid cells massed together in an imperfect plasmodium; ripe 
fructification consisting of masses of free cells, sometimes on a 
stalk. Acrasiales. 
5. Vegetative body a true plasmodium; with free, white stalked spores or 
with spores in a sporangium-like receptacle. 6. 
6. With free, white, stalked spores. Ceratiomyxales. 
0. With spores in sporangium-like receptacles. Myxogastrales. 
7. Mycelium nonseptate, or if septate still with cenocytic divisions; 
spores not in asci nor on basidia, usually formed as the result of the 
conjugation of two similar or dissimilar hyphal branches; zoospores 
or conida present in most forms and in some cases nonmotile, non- 
sexual spores in special sporangia. 8. 
7. Mycelium definitely septate; spores in the normal forms borne in asci 
or on basidia, in some groups the basidia developing from chlamido- 
spores; numerous imperfect forms with only the coni dial stage 
known. 11. 
8. Mycelium with septa; reproduction by means of true eggs and free- 
swimming spermatozoids; aquatic molds. 
Monoblepharideae. Monoblepharidales. 
8. Sexual spores produced by the conjugation of two equal or nearly 
similar hyphal branches; mycelium saprophytic or parasitic on 
plants and animals, especially on insects; no zoospores produced. 
Zygomycetae. 9. 
8. Sexual spores produced by the conjugation of a large branch and a 
small branch, the smaller penetrating the larger by means of a 
tubular process; mycelium parasitic or saprophytic; aquatic molds 
on living or dead animals or aerial plant parasites, often with non- 
sexual zoospores. Oomycetae. 10. 
