Feb., 1913.] The Classificatian of Plants, VIII. 75 



2. Plants consisting of minute, distinct cells with walls, or with the cells 

 arranged in siinple 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, poUengrains 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. 



6. 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 conidial stage 

 known. 11. 



8. Mycelium with septa; reproduction by means of true eggs and free- 



swiinming 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. 



