Soil microflora
Many genera also form spores; the sporangia, or spore cases,
may be found on aerial hyphae, on the colony surface, or free within the environment.
Motility, when present, is conferred by flagella. Many species of actinomycetes occur in soil
and are harmless to animals and higher plants, while some are important pathogens, and many
others are beneficial sources of antibiotics.
Stretomyces - Over 500 species of Streptomyces bacteria have been described. As with the
other Actinobacteria, streptomycetes are Gram-positive, and have genomes with high GC
content. Found predominantly in soil and decaying vegetation, most streptomycetes produce
spores, and are noted for their distinct "earthy" odor that results from production of a volatile
metabolite, geosmin.
Algae - any of numerous groups of chlorophyll-containing, mainly aquatic eukaryotic
organisms ranging from microscopic single-celled forms to multicellular forms 100 feet (30
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